Species Recorded | Taxon | Scientific Name | Common Name | Records | Latest |
| alder fly, lacewing or snake fly | Atlantoraphidia maculicollis | a Snake Fly | 1 | 2018 |
| algae or stonewort | Achnanthes | an Achnanthes species (unidentified) | 1 | 2015 |
| algae or stonewort | Achnanthidium minutissimum | an alga | 1 | 2015 |
| algae or stonewort | Ascophyllum | a Wrack (unidentified) | 1 | 1974 |
| algae or stonewort | Ascophyllum nodosum | Egg Wrack | 32 | 2025 |
| algae or stonewort | Asparagopsis | an Asparagopsis species (unidentified) | 1 | 2005 |
| amphibian | Amphibia | an Amphibia species (unidentified) | 2 | 2000 |
| amphibian | Anura | a frog or toad (unidentified) | 67 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Abia candens | a clubhorned sawfly | 1 | 1999 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Abia fasciata | a clubhorned sawfly | 4 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Abia lonicerae | Honeysuckle Sawfly | 9 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Abia lonicerae/aenea | Cryptic Clubhorn or Honeysuckle Sawfly | 1 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Abia sericea | a clubhorned sawfly | 7 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Achaius oratorius | an ichneumon wasp | 1 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aclastus solutus | an insect - hymenopteran | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aclista alticollis | a small parasitic wasp | 2 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Acrodactyla carinator | an ichneumon wasp | 1 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aegilips nitidula | a small parasitic wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Agenioideus cinctellus | a spider-hunting wasp | 1 | 1999 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aglaostigma | an Aglaostigma species (unidentified) | 2 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aglaostigma aucupariae | a sawfly | 5 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aglaostigma fulvipes | a sawfly | 2 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Agrypon flaveolatum | an ichneumon wasp | 1 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aleiodes praetor | a braconid parasitic wasp | 1 | 2006 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aleiodes signatus | a braconid parasitic wasp | 1 | 1983 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aleiodes similis | a braconid wasp | 2 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Allantus calceatus | a sawfly | 2 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Allantus cinctus | a sawfly | 3 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Allantus rufocinctus | a sawfly | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Allantus truncatus | a sawfly | 1 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Alloplasta piceator | an insect - hymenopteran | 1 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Alloxysta brachyptera | a gall wasp | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Alloxysta victrix | a gall wasp | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Alysia manducator | a braconid wasp | 1 | 1996 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Alysia rufidens | a braconid wasp | 2 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Alysia sophia | a braconid wasp | 1 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Alysiini | an Alysiini braconid wasp (unidentified) | 1 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Amblyteles | an Amblyteles species (unidentified) | 4 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Amblyteles armatorius | an ichneumon wasp | 44 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ametastegia albipes | a sawfly | 1 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ammophila sabulosa | Red Banded Sand Wasp | 2 | 2001 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anacharis eucharoides | a small parasitic wasp | 4 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anacharis immunis | a small parasitic wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ancistrocerus | an Ancistrocerus species (unidentified) | 6 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ancistrocerus gazella | a potter wasp or mason wasp | 9 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ancistrocerus oviventris | a potter wasp or mason wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ancistrocerus parietinus | a potter wasp or mason wasp | 1 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ancistrocerus parietum | Wall Mason Wasp | 6 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Ancistrocerus trifasciatus | a potter wasp or mason wasp | 9 | 2022 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena | a Andrena solitary bee (unidentified) | 54 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena alfkenella | a solitary bee | 2 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena angustior | a solitary bee | 1 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena apicata | a solitary bee | 1 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena bicolor | Gwynne's Mining Bee | 33 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena bucephala | a solitary bee | 11 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena chrysosceles | a solitary bee | 62 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena cineraria | Ashy Mining Bee | 176 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena denticulata | a solitary bee | 4 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena dorsata | Short-fringed Mining Bee | 24 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena flavipes | Yellow Legged Mining Bee | 52 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena fucata | a solitary bee | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena fulva | Tawny Mining Bee | 109 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena fulvago | a solitary bee | 7 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena haemorrhoa | Orange-tailed Mining Bee | 104 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena hattorfiana | a solitary bee | 3 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena helvola | a solitary bee | 3 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena humilis | a solitary bee | 8 | 2007 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena labialis | a solitary bee | 20 | 2018 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena labiata | Girdled Mining Bee | 3 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena marginata | a solitary bee | 2 | 1999 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena (Micrandrena) | an insect - hymenopteran | 1 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena minutula | a solitary bee | 44 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena nigroaenea | a solitary bee | 31 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena nitida | Grey-patched Mining Bee | 91 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena nitidiuscula | a solitary bee | 9 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena ovatula | a solitary bee | 4 | 2005 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena praecox | a solitary bee | 2 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena scotica | Chocolate Mining Bee | 85 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena semilaevis | a solitary bee | 13 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena similis | a solitary bee | 1 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena subopaca | a solitary bee | 8 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena tarsata | Tormentil Mining Bee | 1 | 2012 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena tibialis | a solitary bee | 2 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena trimmerana | Trimmer's Mining Bee | 6 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrena wilkella | Wilke's Mining Bee | 29 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrenidae | an Andreninae species (unidentified) | 2 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andrenidae or Colletidae or Halictidae or Megachilidae or Melittidae sp. (unidentified solitary bee) | a solitary bee (unidentified) | 5 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus aries | Ramshorn Gall Causer | 2 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus aries f. agamic | a Ramshorn Gall Causer | 6 | 2018 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus corruptrix f. agamic | an insect - hymenopteran | 7 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus corruptrix f. sexual | an insect - hymenopteran | 4 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus curvator | a gall wasp | 5 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus curvator f. sexual | an insect - hymenopteran | 9 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus foecundatrix | Artichoke Gall | 22 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus foecundatrix f. agamic | an insect - hymenopteran | 4 | 2006 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus foecundatrix f. sexual | an insect - hymenopteran | 2 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus grossulariae | a gall wasp | 1 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus inflator f. sexual | Twig Gall Causer (form sexual) | 1 | 1996 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus kollari | Marble Gall | 108 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus kollari f. agamic | an insect - hymenopteran | 34 | 2006 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus kollari f. sexual | an insect - hymenopteran | 4 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus legitimus f. sexual | Stunted Acorn Causer (form sexual) | 3 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus lignicola | Cola-nut Gall | 9 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus lignicola f. agamic | an insect - hymenopteran | 24 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus lignicola f. sexual | an insect - hymenopteran | 4 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus quercuscalicis | Knopper Gall | 68 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus quercuscalicis f. agamic | an insect - hymenopteran | 30 | 2011 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus quercuscalicis f. sexual | an insect - hymenopteran | 24 | 1999 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus quercusradicis | a gall wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus quercusradicis f. sexual | an insect - hymenopteran | 4 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus quercusramuli | Cottonwool Gall | 1 | 2017 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus testaceipes | a gall wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Andricus testaceipes f. sexual | an insect - hymenopteran | 1 | 1996 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aneuclis melanarius | an insect - hymenopteran | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aneugmenus padi | a sawfly | 1 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anoplius infuscatus | a spider-hunting wasp | 1 | 1951 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anoplius nigerrimus | a spider-hunting wasp | 16 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anteon jurineanum (sensu lato) | a dryinid wasp | 1 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anthidium manicatum | Wool-carder Bee | 12 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anthophora | an Anthophora species (unidentified) | 3 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anthophora bimaculata | a nomad or mason bee | 2 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anthophora furcata | Fork Tailed Flower Bee | 16 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anthophora plumipes | Hairy-footed Flower Bee | 164 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Anthophora quadrimaculata | a nomad or mason bee | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apechthis compunctor | an ichneumon wasp | 2 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apechthis quadridentata | an ichneumon wasp | 2 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apechthis rufata | an ichneumon wasp | 2 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apethymus serotinus | a sawfly | 1 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aphaereta minuta | a braconid wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aphidius ervi | an aphid parasitic wasp | 1 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apidae | a bee (unidentified) | 160 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apis mellifera | Honey Bee | 1252 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apocrita | an Apocrita species (unidentified) | 1 | 2007 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Apoidea | an Apoidea species (unidentified) | 3 | 2022 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aporus unicolor | a spider-hunting wasp | 2 | 2006 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aproceros leucopoda | Zig-zag Elm Sawfly | 11 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arachnospila anceps | an insect - hymenopteran | 18 | 2017 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arachnospila minutula | a spider-hunting wasp | 1 | 2006 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arachnospila spissa | an insect - hymenopteran | 5 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge | an Arge sawfly (unidentified) | 7 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge berberidis | Berberis Sawfly | 4 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge cyanocrocea | Bramble Sawfly | 20 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge gracilicornis | a sawfly | 2 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge nigripes | a sawfly | 3 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge ochropus | a sawfly | 7 | 2022 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge pagana | Large Rose Sawfly | 26 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge pagana subsp. stephensii | a sawfly | 2 | 1982 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Arge ustulata | a sawfly | 1 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Argidae | an Argidae species (unidentified) | 1 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Argogorytes mystaceus | a Field Digger Wasp | 8 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aritranis director | an insect - hymenopteran | 2 | 2015 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Asaphes suspensus | a chalcid wasp | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Asaphes vulgaris | a chalcid wasp | 4 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aspilota | an Aspilota species (unidentified) | 1 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Astata boops | a solitary wasp | 1 | 2000 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Athalia | an Athalia species (unidentified) | 2 | 2012 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Athalia bicolor | a sawfly | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Athalia circularis | a sawfly | 2 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Athalia cordata | a sawfly | 6 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Athalia cornubiae | a sawfly | 4 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Athalia liberta | a sawfly | 3 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Athalia rosae | Turnip Sawfly | 15 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Atrichomalus trianellatus | a chalcid wasp | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aulogymnus gallarum | a chalcid wasp | 1 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Aulogymnus skianeuros | a chalcid wasp | 81 | 2004 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Auplopus carbonarius | a spider-hunting wasp | 2 | 2022 |
| beetle | Abax parallelepipedus | a ground beetle | 173 | 2023 |
| beetle | Abraeus perpusillus | a carrion beetle | 7 | 2021 |
| beetle | Acalles misellus | a weevil | 18 | 2021 |
| beetle | Acalles ptinoides | a weevil | 12 | 2021 |
| beetle | Achenium depressum | a rove beetle | 1 | 2017 |
| beetle | Acidota cruentata | a rove beetle | 10 | 2021 |
| beetle | Acilius sulcatus | Sulcate Diving Beetle | 23 | 2018 |
| beetle | Acrolocha sulcula | a rove beetle | 1 | 1999 |
| beetle | Acrotona muscorum | a rove beetle | 1 | 2007 |
| beetle | Actenicerus sjaelandicus | Marsh Click Beetle | 1 | 1999 |
| beetle | Acupalpus dubius | a ground beetle | 18 | 2023 |
| beetle | Acupalpus exiguus | a ground beetle | 1 | 2015 |
| beetle | Acupalpus meridianus | a ground beetle | 2 | 2023 |
| beetle | Adalia bipunctata | Two-spot Ladybird | 408 | 2025 |
| beetle | Adalia decempunctata | Ten-spot Ladybird | 196 | 2023 |
| beetle | Aderus populneus | an aderid beetle | 3 | 2017 |
| beetle | Adistemia watsoni | a mould beetle | 1 | 2016 |
| beetle | Adrastus pallens | a click beetle | 5 | 2022 |
| beetle | Agabus | a Agabus water beetle (unidentified) | 21 | 2013 |
| beetle | Agabus biguttatus | a water beetle | 1 | 2019 |
| beetle | Agabus bipustulatus | a water beetle | 167 | 2021 |
| beetle | Agabus conspersus | a water beetle | 2 | 2000 |
| beetle | Agabus didymus | a water beetle | 9 | 2000 |
| beetle | Agabus guttatus | a water beetle | 2 | 2012 |
| beetle | Agabus nebulosus | a water beetle | 35 | 2014 |
| beetle | Agabus paludosus | a water beetle | 1 | 1993 |
| beetle | Agabus sturmii | a water beetle | 78 | 2014 |
| beetle | Agapanthia villosoviridescens | Golden-bloomed Grey Longhorn Beetle | 21 | 2024 |
| beetle | Agaricochara latissima | a rove beetle | 2 | 2014 |
| beetle | Agathidium laevigatum | a round fungus beetle | 3 | 2020 |
| beetle | Agathidium nigrinum | a round fungus beetle | 5 | 2020 |
| beetle | Agathidium nigripenne | a round fungus beetle | 2 | 2020 |
| beetle | Agelastica alni | a leaf beetle | 70 | 2024 |
| beetle | Agonum | an Agonum species (unidentified) | 1 | 1990 |
| beetle | Agonum emarginatum | an insect - beetle (Coleoptera) | 4 | 2018 |
| beetle | Agonum fuliginosum | a ground beetle | 5 | 2016 |
| beetle | Agonum gracile | a ground beetle | 2 | 2002 |
| beetle | Agonum marginatum | a ground beetle | 3 | 2021 |
| beetle | Agonum muelleri | a ground beetle | 17 | 2017 |
| beetle | Agonum nigrum | a ground beetle | 5 | 2019 |
| beetle | Agonum thoreyi | a ground beetle | 4 | 2019 |
| beetle | Agrilus cyanescens | a jewel beetle | 2 | 2023 |
| beetle | Agrilus laticornis | a jewel beetle | 4 | 2023 |
| beetle | Agrilus sinuatus | Hawthorn Jewel Beetle | 11 | 2016 |
| beetle | Agriotes acuminatus | a click beetle | 16 | 2023 |
| beetle | Agriotes lineatus | a click beetle | 39 | 2024 |
| beetle | Agriotes obscurus | a click beetle | 18 | 2023 |
| beetle | Agriotes pallidulus | a click beetle | 98 | 2024 |
| beetle | Agriotes sputator | a click beetle | 18 | 2023 |
| beetle | Agrypnus murinus | a click beetle | 64 | 2023 |
| beetle | Alaobia pallidicornis | a rove beetle | 1 | 2001 |
| beetle | Alaobia trinotata | a rove beetle | 2 | 2001 |
| beetle | Aleochara | an Aleochara species (unidentified) | 1 | 2008 |
| beetle | Aleochara bipustulata | a rove beetle | 2 | 1997 |
| beetle | Aleochara curtula | a rove beetle | 5 | 2003 |
| beetle | Aleochara funebris | a rove beetle | 1 | 2003 |
| beetle | Aleochara grisea | a rove beetle | 1 | 2016 |
| beetle | Aleochara kamila | a rove beetle | 1 | 2001 |
| beetle | Aleochara lanuginosa | a rove beetle | 1 | 1995 |
| beetle | Aleochara sparsa | a rove beetle | 2 | 2001 |
| beetle | Alosterna tabacicolor | a longhorn beetle | 6 | 2022 |
| beetle | Alphitobius diaperinus | a Black Fungus Beetle | 4 | 2020 |
| beetle | Altica | an Altica species (unidentified) | 4 | 2023 |
| beetle | Altica lythri | a leaf beetle | 32 | 2023 |
| beetle | Altica oleracea | a leaf beetle | 6 | 2016 |
| beetle | Altica palustris | a leaf beetle | 8 | 2019 |
| beetle | Amalorrhynchus melanarius | a weevil | 1 | 2015 |
| beetle | Amalus scortillum | a weevil | 1 | 2023 |
| beetle | Amara | an Amara species (unidentified) | 8 | 2023 |
| beetle | Amara aenea | Common Sun Beetle | 54 | 2023 |
| beetle | Amara anthobia | a ground beetle | 1 | 2012 |
| beetle | Amara apricaria | a ground beetle | 5 | 2012 |
| beetle | Amara bifrons | an insect - beetle (Coleoptera) | 2 | 2022 |
| beetle | Amara communis | a ground beetle | 10 | 2015 |
| beetle | Amara consularis | a ground beetle | 1 | 2014 |
| beetle | Amara curta | a ground beetle | 1 | 2004 |
| beetle | Amara familiaris | a ground beetle | 32 | 2023 |
| beetle | Amara fulva | a ground beetle | 1 | 1999 |
| beetle | Amara lunicollis | an insect - beetle (Coleoptera) | 9 | 2022 |
| beetle | Amara montivaga | a ground beetle | 1 | 1999 |
| beetle | Amara ovata | a ground beetle | 25 | 2023 |
| beetle | Amara plebeja | a ground beetle | 28 | 2022 |
| beetle | Amara praetermissa | a ground beetle | 1 | 1985 |
| beetle | Amara similata | a ground beetle | 23 | 2023 |
| beetle | Amara tibialis | a ground beetle | 4 | 2023 |
| beetle | Amischa analis | a rove beetle | 2 | 2008 |
| beetle | Ampedus | an Ampedus species (unidentified) | 1 | 2015 |
| beetle | Ampedus balteatus | a click beetle | 1 | 2012 |
| beetle | Ampedus elongatulus | a click beetle | 1 | 2023 |
| beetle | Amphimallon solstitiale | Summer Chafer | 51 | 2022 |
| beetle | Anacaena | a Anacaena scavenger water beetle (unidentified) | 20 | 1999 |
| beetle | Anacaena bipustulata | a scavenger water beetle | 12 | 2019 |
| beetle | Anacaena globulus | a scavenger water beetle | 108 | 2020 |
| beetle | Anacaena limbata | a scavenger water beetle | 177 | 2023 |
| beetle | Anacaena limbata agg. | an insect - beetle (Coleoptera) | 20 | 2009 |
| beetle | Anacaena lutescens | a scavenger water beetle | 67 | 2009 |
| beetle | Anaglyptus mysticus | a longhorn beetle | 25 | 2024 |
| beetle | Anaspis costai | a tumbling flower beetle | 4 | 2019 |
| beetle | Anaspis fasciata | a tumbling flower beetle | 10 | 2022 |
| beetle | Anaspis frontalis | a tumbling flower beetle | 23 | 2022 |
| beetle | Anaspis garneysi | a tumbling flower beetle | 30 | 2023 |
| beetle | Anaspis lurida | a tumbling flower beetle | 4 | 2019 |
| beetle | Anaspis maculata | a tumbling flower beetle | 69 | 2023 |
| beetle | Anaspis pulicaria | a tumbling flower beetle | 17 | 2018 |
| beetle | Anaspis regimbarti | a tumbling flower beetle | 19 | 2023 |
| beetle | Anaspis rufilabris | a tumbling flower beetle | 3 | 2016 |
| beetle | Anaspis thoracica | a tumbling flower beetle | 9 | 2022 |
| beetle | Anatis ocellata | Eyed Ladybird | 13 | 2022 |
| beetle | Anchomenus dorsalis | a ground beetle | 65 | 2020 |
| beetle | Andrion regensteinense | a weevil | 5 | 2023 |
| beetle | Anisodactylus binotatus | a ground beetle | 10 | 2022 |
| beetle | Anisosticta novemdecimpunctata | 19-spot Ladybird | 22 | 2024 |
| beetle | Anisotoma humeralis | a round fungus beetle | 9 | 2021 |
| beetle | Anobium fulvicorne | a wood boring beetle | 3 | 2015 |
| beetle | Anobium inexspectatum | a wood boring beetle | 1 | 2001 |
| beetle | Anobium punctatum | Woodworm | 78 | 2024 |
| beetle | Anomala dubia | Dune Chafer | 1 | 2009 |
| beetle | Anopleta corvina | a rove beetle | 1 | 2001 |
| beetle | Anotylus clypeonitens | a rove beetle | 1 | 2007 |
| beetle | Anotylus inustus | a rove beetle | 6 | 2021 |
| beetle | Anotylus maritimus | a rove beetle | 1 | 2019 |
| beetle | Anotylus nitidulus | a rove beetle | 1 | 2020 |
| beetle | Anotylus rugosus | a rove beetle | 36 | 2023 |
| beetle | Anotylus sculpturatus | a rove beetle | 134 | 2023 |
| beetle | Anotylus tetracarinatus | a rove beetle | 43 | 2023 |
| beetle | Antherophagus pallens | a silken fungus beetle | 2 | 2021 |
| beetle | Anthicus antherinus | an antlike beetle | 1 | 2019 |
| beetle | Anthobium atrocephalum | a rove beetle | 50 | 2021 |
| beetle | Anthobium unicolor | a rove beetle | 58 | 2021 |
| beetle | Anthocomus fasciatus | a malachite beetle | 6 | 2022 |
| beetle | Anthocomus rufus | a malachite beetle | 13 | 2023 |
| beetle | Anthonomus bituberculatus | a weevil | 3 | 2018 |
| beetle | Anthonomus pedicularius | a weevil | 19 | 2019 |
| beetle | Anthonomus pomorum | Apple Blossom Weevil | 1 | 1970 |
| beetle | Anthonomus rubi | Strawberry Blossom Weevil | 21 | 2023 |
| beetle | Anthracus consputus | a ground beetle | 1 | 2013 |
| beetle | Anthrenus fuscus | a museum or larder beetle | 2 | 2016 |
| beetle | Anthrenus verbasci | a Museum Beetle | 35 | 2024 |
| beetle | Anthribus fasciatus | a fungus weevil | 2 | 2023 |
| beetle | Aphanisticus pusillus | a jewel beetle | 2 | 2019 |
| beetle | Aphidecta obliterata | a ladybird | 9 | 2024 |
| beetle | Aphodius | an Aphodius species (unidentified) | 5 | 2023 |
| beetle | Aphodius ater | a dung beetle or chafer | 2 | 2021 |
| beetle | Aphodius borealis | a dung beetle or chafer | 1 | 2014 |
| beetle | Aphodius coenosus | a dung beetle or chafer | 3 | 2023 |
| beetle | Aphodius consputus | a dung beetle or chafer | 1 | 2025 |
| beetle | Aphodius contaminatus | a dung beetle or chafer | 2 | 2015 |
| beetle | Aphodius depressus | a dung beetle or chafer | 1 | 2014 |
| beetle | Aphodius distinctus | a dung beetle or chafer | 2 | 2019 |
| beetle | Aphodius fimetarius | a dung beetle or chafer | 13 | 2020 |
| beetle | Aphodius fimetarius/pedellus agg. (pre 2001) | an Aphodius beetle | 1 | 2016 |
| beetle | Aphodius foetens | a dung beetle or chafer | 1 | 1990 |
| beetle | Aphodius fossor | a dung beetle or chafer | 5 | 2023 |
| beetle | Aphodius granarius | a dung beetle or chafer | 1 | 1994 |
| beetle | Aphodius haemorrhoidalis | a dung beetle or chafer | 2 | 2019 |
| beetle | Aphodius luridus | a dung beetle or chafer | 1 | 2001 |
| beetle | Aphodius obliteratus | a dung beetle or chafer | 3 | 2021 |
| beetle | Aphodius prodromus | a dung beetle or chafer | 47 | 2023 |
| beetle | Aphodius pusillus | a dung beetle or chafer | 4 | 2023 |
| beetle | Aphodius rufipes | a dung beetle or chafer | 152 | 2024 |
| beetle | Aphodius rufus | a dung beetle or chafer | 8 | 2023 |
| beetle | Aphodius sphacelatus | a dung beetle or chafer | 10 | 2019 |
| beetle | Aphodius sticticus | a dung beetle or chafer | 7 | 2023 |
| beetle | Aphthona atrocaerulea | a leaf beetle | 1 | 2001 |
| beetle | Aphthona euphorbiae | Large Flax Flea Beetle | 33 | 2021 |
| beetle | Aphthona lutescens | a leaf beetle | 9 | 2004 |
| beetle | Aphthona nigriceps | a leaf beetle | 1 | 2017 |
| beetle | Aphthona nonstriata | Iris Flea Beetle | 19 | 2023 |
| beetle | Apion | an Apion species (unidentified) | 3 | 2016 |
| beetle | Apion cruentatum | a seed weevil | 1 | 1999 |
| beetle | Apion frumentarium | a seed weevil | 53 | 2023 |
| beetle | Apionidae | an Apionidae species (unidentified) | 6 | 2024 |
| beetle | Aploderus caelatus | a rove beetle | 1 | 1977 |
| beetle | Aplotarsus incanus | a click beetle | 2 | 2012 |
| beetle | Apoderus coryli | Hazel Leaf-roller Weevil | 33 | 2025 |
| beetle | Apteropeda orbiculata | a leaf beetle | 3 | 2015 |
| beetle | Archarius pyrrhoceras | a weevil | 27 | 2020 |
| beetle | Archarius salicivorus | Willow Gall Weevil | 11 | 2023 |
| beetle | Arhopalus rusticus | a longhorn beetle | 3 | 2020 |
| beetle | Aromia moschata | Musk Beetle | 7 | 2023 |
| beetle | Asaphidion curtum | a ground beetle | 9 | 2023 |
| beetle | Asaphidion flavipes | a ground beetle | 41 | 2023 |
| beetle | Asaphidion flavipes agg. | a ground beetle | 1 | 1969 |
| beetle | Asaphidion stierlini | a ground beetle | 1 | 2023 |
| beetle | Asemum striatum | a longhorn beetle | 2 | 1993 |
| beetle | Aspidapion aeneum | a seed weevil | 1 | 2008 |
| beetle | Aspidapion radiolus | a seed weevil | 5 | 2022 |
| beetle | Aspidiphorus orbiculatus | a slime mould beetle | 23 | 2021 |
| beetle | Astenus pulchellus | a rove beetle | 1 | 2017 |
| beetle | Atheta crassicornis | a rove beetle | 1 | 2001 |
| beetle | Atheta harwoodi | a rove beetle | 1 | 2001 |
| beetle | Atheta ravilla | a rove beetle | 2 | 2001 |
| beetle | Atheta vaga | a rove beetle | 1 | 2001 |
| beetle | Atheta xanthopus | a rove beetle | 2 | 2003 |
| beetle | Atholus bimaculatus | a carrion beetle | 1 | 2017 |
| beetle | Atholus duodecimstriatus | a carrion beetle | 1 | 2017 |
| beetle | Athous | an Athous species (unidentified) | 1 | 2023 |
| beetle | Athous bicolor | a click beetle | 9 | 2022 |
| beetle | Athous campyloides | a click beetle | 2 | 2021 |
| beetle | Athous haemorrhoidalis | a click beetle | 253 | 2024 |
| beetle | Athous vittatus | a click beetle | 5 | 2015 |
| beetle | Atomaria atricapilla | a silken fungus beetle | 2 | 2016 |
| beetle | Atomaria fuscata | a silken fungus beetle | 1 | 1999 |
| beetle | Atomaria lewisi | a silken fungus beetle | 9 | 2021 |
| beetle | Atomaria linearis | Pygmy Beetle | 1 | 2016 |
| beetle | Atomaria nigriventris | a silken fungus beetle | 1 | 2017 |
| beetle | Atomaria testacea | a silken fungus beetle | 4 | 2020 |
| beetle | Atrecus affinis | a rove beetle | 7 | 2016 |
| beetle | Attagenus pellio | Two-spotted Carpet Beetle | 4 | 2019 |
| beetle | Attelabus nitens | Oak Leaf-roller | 1 | 2004 |
| beetle | Augyles maritimus | a mud beetle | 2 | 2016 |
| beetle | Aulonothroscus brevicollis | a small false click beetle | 7 | 2023 |
| beetle | Autalia impressa | a rove beetle | 7 | 2020 |
| beetle | Autalia longicornis | a rove beetle | 3 | 2020 |
| beetle | Autalia rivularis | a rove beetle | 1 | 2017 |
| bird | Acanthis | a redpoll (unidentified) | 155 | 2024 |
| bird | Acanthis cabaret | Lesser Redpoll | 2011 | 2023 |
| bird | Acanthis flammea | Common Redpoll | 698 | 2020 |
| bird | Acanthis flammea flammea | Mealy Redpoll | 6 | 2009 |
| bird | Accipiter | an Accipiter species (unidentified) | 3 | 2015 |
| bird | Accipiter gentilis | Goshawk | 101 | 2023 |
| bird | Accipiter nisus | Sparrowhawk | 20186 | 2025 |
| bird | Accipitridae sp. or Falconidae sp. (unidentified bird of prey not including owls) | a bird of prey not including owls (unidentified) | 28 | 2016 |
| bird | Accipitriformes | an Accipitriformes species (unidentified) | 1 | 2024 |
| bird | Acrocephalus | an Acrocephalus warbler (unidentified) | 6 | 2019 |
| bird | Acrocephalus arundinaceus | Great Reed Warbler | 8 | 2014 |
| bird | Acrocephalus paludicola | Aquatic Warbler | 29 | 1999 |
| bird | Acrocephalus palustris | Marsh Warbler | 9 | 2022 |
| bird | Acrocephalus schoenobaenus | Sedge Warbler | 5477 | 2025 |
| bird | Acrocephalus scirpaceus | Reed Warbler | 10375 | 2025 |
| bird | Actitis hypoleucos | Common Sandpiper | 12234 | 2025 |
| bird | Actitis macularius | Spotted Sandpiper | 30 | 2018 |
| bird | Aegithalidae | an Aegithalidae species (unidentified) | 17 | 2025 |
| bird | Aegithalos caudatus | Long-tailed Tit | 34603 | 2025 |
| bird | Aix galericulata | Mandarin | 690 | 2024 |
| bird | Aix sponsa | Wood Duck | 55 | 2018 |
| bird | Alauda arvensis | Skylark | 18316 | 2025 |
| bird | Alca torda | Razorbill | 14 | 2020 |
| bird | Alcedo atthis | Kingfisher | 15165 | 2025 |
| bird | Alcidae | an auk (unidentified) | 7 | 2020 |
| bird | Alectoris chukar | Chukar Partridge | 1 | 2015 |
| bird | Alectoris rufa | Red-legged Partridge | 1368 | 2023 |
| bird | Alle alle | Little Auk | 3 | 2016 |
| bird | Alopochen aegyptiaca | Egyptian Goose | 2682 | 2024 |
| bird | Alopochen or Anser or Branta sp. (unidentified) | a goose (unidentified) | 4 | 2021 |
| bird | Anas | an Anas duck (unidentified) | 20 | 2025 |
| bird | Anas acuta | Pintail | 4702 | 2023 |
| bird | Anas capensis | a bird | 1 | 1995 |
| bird | Anas carolinensis | Green-winged Teal | 155 | 2021 |
| bird | Anas crecca | Teal | 15937 | 2025 |
| bird | Anas platyrhynchos | Mallard | 33710 | 2025 |
| bird | Anas platyrhynchos (Cayuga Duck) | Cayuga Duck | 1 | 2023 |
| bird | Anas platyrhynchos domesticus | Domestic Mallard | 72 | 2023 |
| bird | Anas platyrhynchos x | Mallard hybrid | 13 | 2019 |
| bird | Anatidae | a duck or swan or goose (unidentified) | 68 | 2021 |
| bird | Anatidae sp. (unidentified Ayelsbury or white domestic duck) | Aylesbury Duck or white domestic duck (unidentified) | 9 | 2007 |
| bird | Anser | an Anser species (unidentified) | 21 | 2015 |
| bird | Anser albifrons | White-fronted Goose | 271 | 2022 |
| bird | Anser albifrons flavirostris | Greenland White-fronted Goose | 1 | 2019 |
| bird | Anser albifrons x Branta leucopsis | White-fronted Goose x Barnacle Goose | 5 | 2018 |
| bird | Anser anser | Greylag Goose | 2590 | 2024 |
| bird | Anser anser f. domesticus | Domestic Goose | 6 | 2023 |
| bird | Anser anser x Branta canadensis | Greylag x Canada Goose | 32 | 2019 |
| bird | Anser brachyrhynchus | Pink-footed Goose | 249 | 2024 |
| bird | Anser caerulescens | Snow Goose | 11 | 2002 |
| bird | Anser caerulescens x Branta canadensis | snow x canada goose | 3 | 1997 |
| bird | Anser cygnoides | Swan Goose | 9 | 2009 |
| bird | Anser erythropus | Lesser White-fronted Goose | 9 | 2001 |
| bird | Anser fabalis | Bean Goose | 7 | 2020 |
| bird | Anser indicus | Bar-headed Goose | 118 | 2019 |
| bird | Anthus | a pipit (unidentified) | 10 | 2020 |
| bird | Anthus campestris | Tawny Pipit | 1 | 2010 |
| bird | Anthus cervinus | Red-throated Pipit | 7 | 2015 |
| bird | Anthus petrosus | Rock Pipit | 4591 | 2025 |
| bird | Anthus petrosus littoralis | Scandinavian Rock Pipit | 3 | 2022 |
| bird | Anthus pratensis | Meadow Pipit | 13614 | 2025 |
| bird | Anthus richardi | Richard's Pipit | 81 | 2021 |
| bird | Anthus spinoletta | Water Pipit | 1559 | 2022 |
| bird | Anthus spinoletta/petrosus agg. | Rock/Water Pipit | 4 | 1987 |
| bird | Anthus trivialis | Tree Pipit | 1261 | 2022 |
| bird | Apodidae | an Apodidae species (unidentified) | 9 | 2024 |
| bird | Apus | a swift (unidentified) | 1 | 2018 |
| bird | Apus apus | Swift | 12924 | 2025 |
| bird | Apus pallidus | Pallid Swift | 25 | 2022 |
| bird | Ardea alba | Great White Egret | 8305 | 2025 |
| bird | Ardea cinerea | Grey Heron | 25416 | 2025 |
| bird | Ardea purpurea | Purple Heron | 12 | 2020 |
| bird | Ardeidae | Herons, bitterns | 2 | 2020 |
| bird | Ardenna grisea | Sooty Shearwater | 1 | 2017 |
| bird | Ardeola ralloides | Squacco Heron | 5 | 2012 |
| bird | Arenaria interpres | Turnstone | 6358 | 2024 |
| bird | Asio flammeus | Short-eared Owl | 3965 | 2024 |
| bird | Asio otus | Long-eared Owl | 378 | 2021 |
| bird | Athene noctua | Little Owl | 4449 | 2025 |
| bird | Aves | a bird (unidentified) | 21 | 2024 |
| bird | Aythya | an Aythya duck species (unidentified) | 341 | 2019 |
| bird | Aythya affinis | Lesser Scaup | 657 | 2022 |
| bird | Aythya collaris | Ring-necked Duck | 453 | 2022 |
| bird | Aythya ferina | Pochard | 4388 | 2024 |
| bird | Aythya ferina/fuligula agg. | Pochard/Tufted Duck | 134 | 2019 |
| bird | Aythya ferina x Aythya collaris | Pochard/Ring-necked Duck | 8 | 2013 |
| bird | Aythya ferina x Aythya nyroca | Pochard x Ferruginous Duck | 20 | 2019 |
| bird | Aythya fuligula | Tufted Duck | 12887 | 2025 |
| bird | Aythya marila | Scaup | 3712 | 2022 |
| bird | Aythya marila x fuligula | Scaup X Tufted Duck Hybrid | 74 | 2019 |
| bird | Aythya nyroca | Ferruginous Duck | 434 | 2020 |
| bird | Aythya nyroca x Aythya fuligula | Ferruginous x Tufted Duck | 18 | 2013 |
| bird | Aythya valisineria x Aythya ferina | Canvasback x Pochard | 5 | 2009 |
| booklouse or barklouse | Amphigerontia contaminata | a booklouse or barklouse | 1 | 1998 |
| bryozoan | Alcyonidium gelatinosum | a bryozoan | 7 | 1976 |
| bryozoan | Amathia imbricata | a bryozoan | 4 | 1976 |
| bryozoan | Amphiblestrum auritum | a bryozoan | 8 | 1995 |
| bug | Acalypta parvula | a lace bug | 3 | 2020 |
| bug | Acanthosoma haemorrhoidale | Hawthorn Shieldbug | 327 | 2025 |
| bug | Acanthosomatidae or Cydnidae or Scutelleridae or Pentatomidae | a shield bug (unidentified) | 47 | 2019 |
| bug | Acericerus heydenii | a leafhopper | 4 | 2023 |
| bug | Acericerus ribauti | a leafhopper | 2 | 2015 |
| bug | Acericerus vittifrons | a leafhopper | 2 | 2021 |
| bug | Acetropis (Acetropis) gimmerthalii | a plantbug or grassbug | 7 | 2024 |
| bug | Acyrthosiphon (Acyrthosiphon) pisum | Pea Aphid | 11 | 1975 |
| bug | Adelphocoris lineolatus | a plantbug or grassbug | 30 | 2025 |
| bug | Adomerus biguttatus | a shield bug | 1 | 1957 |
| bug | Aelia acuminata | Bishop's Mitre | 116 | 2025 |
| bug | Agallia consobrina | a leafhopper | 3 | 2023 |
| bug | Agramma (Agramma) laetum | a lace bug | 1 | 2019 |
| bug | Alebra | an Alebra species (unidentified) | 1 | 2020 |
| bug | Alebra albostriella | a leafhopper | 5 | 2022 |
| bug | Alebra coryli | a leafhopper | 3 | 2020 |
| bug | Alebra wahlbergi | a leafhopper | 2 | 2020 |
| bug | Aleyrodidae sp. | a whitefly (unidentified) | 8 | 2009 |
| bug | Alloeotomus gothicus | a plantbug or grassbug | 1 | 2018 |
| bug | Allygus mixtus | a leafhopper | 16 | 2025 |
| bug | Allygus modestus | a leafhopper | 1 | 1998 |
| bug | Alnetoidea alneti | a leafhopper | 5 | 2010 |
| bug | Alydus calcaratus | an ant bug | 2 | 2023 |
| bug | Amblytylus brevicollis | a plantbug or grassbug | 1 | 2008 |
| bug | Amblytylus nasutus | a plantbug or grassbug | 3 | 2023 |
| bug | Amphorophora (Amphorophora) rubi | Rubus Aphid | 7 | 1975 |
| bug | Anaceratagallia ribauti | a leafhopper | 3 | 2023 |
| bug | Aneurus (Aneurodes) avenius | a flat bark bug | 1 | 2017 |
| bug | Aneurus (Aneurus) laevis | a flat bark bug | 7 | 2017 |
| bug | Anoecia (Anoecia) corni | Common Dogwood-grass Aphid | 3 | 2018 |
| bug | Anoscopus albifrons | a leafhopper | 8 | 2022 |
| bug | Anoscopus flavostriatus | a leafhopper | 3 | 2018 |
| bug | Anthocoridae | a flower bug (unidentified) | 2 | 2018 |
| bug | Anthocoris | an Anthocoris species (unidentified) | 1 | 2017 |
| bug | Anthocoris confusus | a flower bug or bloodsucking bug | 55 | 2024 |
| bug | Anthocoris limbatus | a flower bug or bloodsucking bug | 1 | 1999 |
| bug | Anthocoris minki | a flower bug or bloodsucking bug | 1 | 2019 |
| bug | Anthocoris nemoralis | a flower bug or bloodsucking bug | 90 | 2023 |
| bug | Anthocoris nemorum | Common Flower Bug | 299 | 2024 |
| bug | Anthocoris simulans | a flower bug or bloodsucking bug | 3 | 2018 |
| bug | Aphelocheirus (Aphelocheirus) aestivalis | an aphelocheirid bug | 1 | 1978 |
| bug | Aphididae | an aphid (unidentified) | 90 | 2023 |
| bug | Aphis | an Aphis species (unidentified) | 37 | 2012 |
| bug | Aphis (Aphis) fabae | Black Bean Aphid | 40 | 2023 |
| bug | Aphis (Aphis) fabae subsp. cirsiiacanthoidis | Black Spindle-thistle Aphid | 1 | 2013 |
| bug | Aphis (Aphis) hederae | an aphid | 3 | 2022 |
| bug | Aphis (Aphis) idaei | Raspberry Aphid | 1 | 2013 |
| bug | Aphis (Aphis) jacobaeae | Ragwort Aphid | 1 | 2017 |
| bug | Aphis (Aphis) ruborum | Small Bramble Aphid | 1 | 2019 |
| bug | Aphis (Aphis) sambuci | Elder Aphid | 5 | 2023 |
| bug | Aphis (Aphis) umbrella | an aphid | 2 | 2022 |
| bug | Aphis (Aphis) urticata | an aphid | 1 | 2023 |
| bug | Aphrodes | an Aphrodes species (unidentified) | 1 | 2011 |
| bug | Aphrodes bicincta | a leafhopper | 18 | 2014 |
| bug | Aphrodes makarovi | a leafhopper | 12 | 2021 |
| bug | Aphrophora | a Aphrophora froghopper (unidentified) | 7 | 2018 |
| bug | Aphrophora alni | Alder Spittlebug | 120 | 2024 |
| bug | Aphrophora pectoralis | a froghopper | 1 | 2020 |
| bug | Aphrophora salicina | a froghopper | 3 | 2018 |
| bug | Apolygus lucorum | a plantbug or grassbug | 11 | 2019 |
| bug | Apolygus spinolae | a plantbug or grassbug | 4 | 2020 |
| bug | Aquarius | an Aquarius species (unidentified) | 4 | 2007 |
| bug | Aquarius najas | an insect - true bug (Hemiptera) | 2 | 2023 |
| bug | Aradus depressus | a flat bark bug | 14 | 2024 |
| bug | Arboridia ribauti | a leafhopper | 2 | 2023 |
| bug | Arocatus | an Arocatus bug (unidentified) | 1 | 2011 |
| bug | Arthaldeus pascuellus | a leafhopper | 8 | 2022 |
| bug | Arthaldeus striifrons | a leafhopper | 2 | 2013 |
| bug | Atractotomus mali | a plantbug or grassbug | 9 | 2021 |
| bug | Aulacorthum (Aulacorthum) solani | Glasshouse and Potato Aphid | 15 | 1997 |
| caddis fly | Adicella reducta | a caddisfly | 1 | 2018 |
| caddis fly | Agapetus | a Agapetus caddisfly (unidentified) | 1 | 2009 |
| caddis fly | Agapetus fuscipes | a caddisfly | 7 | 2019 |
| caddis fly | Agraylea multipunctata | a caddisfly | 3 | 1998 |
| caddis fly | Agrypnia varia | a caddisfly | 5 | 2023 |
| caddis fly | Anabolia nervosa | a caddisfly | 14 | 2019 |
| caddis fly | Athripsodes albifrons | a caddisfly | 6 | 2023 |
| caddis fly | Athripsodes aterrimus | a caddisfly | 6 | 2019 |
| caddis fly | Athripsodes bilineatus | a caddisfly | 3 | 2022 |
| caddis fly | Athripsodes cinereus | a caddisfly | 9 | 2021 |
| caddis fly | Athripsodes commutatus | a caddisfly | 2 | 2014 |
| crustacean | Amphibalanus improvisus | a barnacle | 9 | 1976 |
| crustacean | Amphipoda | a Amphipoda freshwater shrimp (unidentified) | 18 | 2023 |
| crustacean | Apohyale prevostii | a crustacean | 6 | 1974 |
| crustacean | Arcitalitrus | an Arcitalitrus species (unidentified) | 2 | 2017 |
| crustacean | Arcitalitrus dorrieni | a sand hopper | 19 | 2023 |
| crustacean | Armadillidium | an Armadillidium species (unidentified) | 7 | 2023 |
| crustacean | Astacidae | a crayfish (unidentified) | 31 | 2017 |
| crustacean | Astacus astacus | Noble Crayfish | 5 | 2002 |
| crustacean | Astacus leptodactylus | Turkish Crayfish | 4 | 2008 |
| crustacean | Austrominius modestus | Darwin's Barnacle | 18 | 2025 |
| crustacean | Austropotamobius pallipes | White-clawed Crayfish | 149 | 2023 |
| crustacean | Axius stirhynchus | a crustacean | 1 | 2005 |
| diatom | Amphora libyca | a diatom | 1 | 2015 |
| diatom | Amphora pediculus | a diatom | 1 | 2015 |
| dragonfly, hawker or damselfly | Aeshna | an Aeshna dragonfly (unidentified) | 65 | 2020 |
| dragonfly, hawker or damselfly | Aeshna affinis | Southern Migrant Hawker | 1 | 2023 |
| dragonfly, hawker or damselfly | Aeshna cyanea | Southern Hawker | 3326 | 2025 |
| dragonfly, hawker or damselfly | Aeshna grandis | Brown Hawker | 698 | 2024 |
| dragonfly, hawker or damselfly | Aeshna juncea | Common Hawker | 29 | 2020 |
| dragonfly, hawker or damselfly | Aeshna mixta | Migrant Hawker | 1241 | 2024 |
| dragonfly, hawker or damselfly | Aeshnidae | an Aeshnidae species (unidentified) | 11 | 2023 |
| dragonfly, hawker or damselfly | Anax | an Anax species (unidentified) | 4 | 2023 |
| dragonfly, hawker or damselfly | Anax ephippiger | Vagrant Emperor Dragonfly | 2 | 2013 |
| dragonfly, hawker or damselfly | Anax imperator | Emperor Dragonfly | 1936 | 2025 |
| dragonfly, hawker or damselfly | Anax parthenope | Lesser Emperor Dragonfly | 46 | 2023 |
| dragonfly, hawker or damselfly | Anisoptera | a Anisoptera dragonfly (unidentified) | 354 | 2018 |
| fish | Abramis brama | Bream | 21 | 2018 |
| fish | Abramis brama x Rutilus rutilus | a bony fish (Actinopterygii) | 2 | 1991 |
| fish | Acipenser sturio | Sturgeon | 3 | 1941 |
| fish | Agonus cataphractus | Armed Bullhead | 2 | 1933 |
| fish | Alburnus alburnus | Bleak | 9 | 2018 |
| fish | Alosa | an Alosa species (unidentified) | 1 | 1995 |
| fish | Alosa alosa | Allis Shad | 3 | 1940 |
| fish | Alosa fallax | Twaite Shad | 2 | 1933 |
| fish | Ammodytes tobianus | Lesser Sand-eel | 3 | 1938 |
| fish | Anguilla anguilla | Eel | 184 | 2025 |
| fish | Aphia minuta | Transparent Goby | 1 | 1879 |
| fish | Argyropelecus olfersii | Silver Hatchet Fish | 1 | 2003 |
| fish | Arnoglossus laterna | Mediterranean Scaldfish | 1 | 1879 |
| fish | Atherina presbyter | Sand Smelt | 2 | 1938 |
| foraminiferan | Ammonia beccarii | a foraminiferan | 2 | 1976 |
| fungus | Abortiporus biennis | Blushing Rosette | 12 | 2022 |
| fungus | Abrothallus parmeliarum | a fungus | 1 | 1996 |
| fungus | Acrospermum compressum | an ascomycete fungus | 3 | 1997 |
| fungus | Agaricales | an Agricales fungus (unidentified) | 4 | 2023 |
| fungus | Agaricus | an Agaricus species (unidentified) | 2 | 2011 |
| fungus | Agaricus abruptibulbus | an agaric | 5 | 1999 |
| fungus | Agaricus altipes | an agaric | 6 | 2008 |
| fungus | Agaricus arvensis | Horse Mushroom | 16 | 2022 |
| fungus | Agaricus augustus | Prince (The) | 29 | 2023 |
| fungus | Agaricus bernardii | an agaric | 32 | 2021 |
| fungus | Agaricus bisporus | an agaric | 20 | 2013 |
| fungus | Agaricus bitorquis | an agaric | 24 | 2010 |
| fungus | Agaricus bohusii | an agaric | 1 | 2019 |
| fungus | Agaricus bresadolanus | an agaric | 2 | 1999 |
| fungus | Agaricus campestris | an agaric | 19 | 2021 |
| fungus | Agaricus campestris var. campestris | Field Mushroom | 149 | 2020 |
| fungus | Agaricus comtulus | an agaric | 37 | 2011 |
| fungus | Agaricus cupreobrunneus | an agaric | 2 | 1996 |
| fungus | Agaricus depauperatus | an agaric | 3 | 2007 |
| fungus | Agaricus dulcidulus | an agaric | 33 | 2013 |
| fungus | Agaricus fuscofibrillosus | an agaric | 11 | 2010 |
| fungus | Agaricus impudicus | an agaric | 18 | 2021 |
| fungus | Agaricus langei | an agaric | 14 | 2021 |
| fungus | Agaricus litoralis | an agaric | 1 | 2021 |
| fungus | Agaricus luteomaculatus | an agaric | 2 | 2014 |
| fungus | Agaricus lutosus | an agaric | 2 | 2012 |
| fungus | Agaricus macrocarpus | an agaric | 1 | 2008 |
| fungus | Agaricus moelleri | Inky Mushroom | 61 | 2021 |
| fungus | Agaricus osecanus | an agaric | 34 | 2014 |
| fungus | Agaricus phaeolepidotus | an agaric | 16 | 2023 |
| fungus | Agaricus placomyces | an agaric | 44 | 2007 |
| fungus | Agaricus porphyrizon | an agaric | 44 | 2014 |
| fungus | Agaricus porphyrocephalus | an agaric | 16 | 2006 |
| fungus | Agaricus rusiophyllus | an agaric | 2 | 1997 |
| fungus | Agaricus semotus | an agaric | 33 | 2005 |
| fungus | Agaricus subfloccosus | an agaric | 5 | 2014 |
| fungus | Agaricus subperonatus | an agaric | 6 | 2010 |
| fungus | Agaricus sylvaticus | an agaric | 72 | 2022 |
| fungus | Agaricus sylvicola | a Wood Mushroom | 11 | 2019 |
| fungus | Agaricus sylvicola var. sylvicola | Wood Mushroom | 48 | 2022 |
| fungus | Agaricus urinascens var. urinascens | an agaric | 41 | 2011 |
| fungus | Agaricus xanthodermus | Yellow Stainer | 70 | 2022 |
| fungus | Agrocybe | an Agrocybe species (unidentified) | 1 | 2023 |
| fungus | Agrocybe cylindracea | an agaric | 36 | 2014 |
| fungus | Agrocybe erebia | an agaric | 15 | 2013 |
| fungus | Agrocybe molesta | an agaric | 38 | 2014 |
| fungus | Agrocybe paludosa | an agaric | 16 | 2003 |
| fungus | Agrocybe pediades | an agaric | 136 | 2023 |
| fungus | Agrocybe praecox | an agaric | 94 | 2023 |
| fungus | Agrocybe putaminum | a fungus | 3 | 2009 |
| fungus | Agrocybe rivulosa | a fungus | 5 | 2019 |
| fungus | Agrocybe sphaleromorpha | an agaric | 13 | 2002 |
| fungus | Agrocybe vervacti | an agaric | 3 | 2003 |
| fungus | Albatrellus ovinus | a bolete | 10 | 1994 |
| fungus | Albugo candida | an oomycete fungus | 1 | 2020 |
| fungus | Aleuria aurantia | Orange-peel Fungus | 9 | 2023 |
| fungus | Amanita castaneogrisea | a fungus | 1 | 2013 |
| fungus | Amanita ceciliae | Snakeskin Grisette | 18 | 2021 |
| fungus | Amanita citrina | False Death Cap | 8 | 2013 |
| fungus | Amanita citrina var. alba | a basidiomycete fungus | 1 | 2007 |
| fungus | Amanita citrina var. citrina | an agaric | 1 | 2012 |
| fungus | Amanita echinocephala | a basidiomycete fungus | 18 | 2022 |
| fungus | Amanita excelsa var. excelsa | a basidiomycete fungus | 10 | 1999 |
| fungus | Amanita excelsa var. spissa | a fungus | 2 | 2014 |
| fungus | Amanita fulva | Tawny Grisette | 6 | 2010 |
| fungus | Amanita gemmata | a basidiomycete fungus | 1 | 1997 |
| fungus | Amanita lividopallescens | a basidiomycete fungus | 1 | 2020 |
| fungus | Amanita muscaria | a fungus | 14 | 2019 |
| fungus | Amanita muscaria var. muscaria | Fly Agaric | 27 | 2022 |
| fungus | Amanita pantherina | Panther Cap | 1 | 2011 |
| fungus | Amanita phalloides | Death Cap | 66 | 2021 |
| fungus | Amanita porphyria | a basidiomycete fungus | 2 | 2008 |
| fungus | Amanita rubescens | Blusher | 25 | 2019 |
| fungus | Amanita rubescens var. annulosulphurea | a basidiomycete fungus | 1 | 1995 |
| fungus | Amanita rubescens var. rubescens | a Blusher | 89 | 2010 |
| fungus | Amanita solitaria | a basidiomycete fungus | 4 | 2001 |
| fungus | Amanita spadicea | a fungus | 1 | 2009 |
| fungus | Amanita strobiliformis | an agaric | 5 | 2017 |
| fungus | Amanita submembranacea | a basidiomycete fungus | 2 | 2020 |
| fungus | Amanita vaginata | Grisette | 14 | 2022 |
| fungus | Ampelomyces quisqualis | a fungus | 2 | 2008 |
| fungus | Amphiporthe leiphaemia | an ascomycete fungus | 1 | 1998 |
| fungus | Ampulloclitocybe clavipes | Club Foot | 16 | 2021 |
| fungus | Amylostereum laevigatum | a basidiomycete fungus | 30 | 2014 |
| fungus | Anisomeridium biforme | an ascomycete fungus | 1 | 2010 |
| fungus | Anisomeridium polypori | an ascomycete fungus | 2 | 1991 |
| fungus | Annulohypoxylon cohaerens | a fungus | 3 | 2025 |
| fungus | Annulohypoxylon minutellum | a fungus | 2 | 2010 |
| fungus | Annulohypoxylon multiforme | Birch Woodwart | 83 | 2012 |
| fungus | Anthostomella rubicola | an ascomycete fungus | 1 | 1994 |
| fungus | Anthracobia macrocystis | a fungus | 11 | 2013 |
| fungus | Anthracobia melaloma | a fungus | 2 | 2014 |
| fungus | Antrodia serialis | a basidiomycete fungus | 6 | 2014 |
| fungus | Antrodia xantha | a basidiomycete fungus | 1 | 2013 |
| fungus | Apiognomonia errabunda | an ascomycete fungus | 4 | 2013 |
| fungus | Appendiculella calostroma | a fungus | 3 | 2009 |
| fungus | Arachnopeziza aurelia | an ascomycete fungus | 1 | 2005 |
| fungus | Armillaria | an Armillaria species (unidentified) | 4 | 2012 |
| fungus | Armillaria cepistipes | a fungus | 1 | 2006 |
| fungus | Armillaria gallica | Bulbous Honey Fungus | 19 | 2021 |
| fungus | Armillaria lutea | a fungus | 1 | 2007 |
| fungus | Armillaria mellea | Honey Fungus | 314 | 2024 |
| fungus | Armillaria ostoyae | Dark Honey Fungus | 9 | 2011 |
| fungus | Armillaria tabescens | Ringless Honey Fungus | 1 | 1997 |
| fungus | Arrhenia griseopallida | a basidiomycete fungus | 1 | 1999 |
| fungus | Arrhenia obscurata | a basidiomycete fungus | 2 | 2010 |
| fungus | Arrhenia retiruga | a basidiomycete fungus | 1 | 2014 |
| fungus | Arrhenia rickenii | a basidiomycete fungus | 1 | 2013 |
| fungus | Arrhenia spathulata | a basidiomycete fungus | 2 | 2020 |
| fungus | Arthonia apotheciorum | a fungus | 2 | 2013 |
| fungus | Arthonia epiphyscia | a fungus | 1 | 2016 |
| fungus | Arthonia punctiformis | a fungus | 3 | 2010 |
| fungus | Arthopyrenia punctiformis | a fungus | 7 | 2016 |
| fungus | Arthrinium phaeospermum | a filomentous fungus | 1 | 1997 |
| fungus | Ascobolus carbonarius | a fungus | 1 | 1995 |
| fungus | Ascobolus equinus | a fungus | 1 | 2001 |
| fungus | Ascobolus leveillei | a fungus | 1 | 1999 |
| fungus | Ascobolus stercorarius | a fungus | 1 | 2014 |
| fungus | Ascochyta mercurialis | a blight fungus | 1 | 2000 |
| fungus | Ascocoryne cylichnium | an ascomycete fungus | 11 | 2021 |
| fungus | Ascocoryne sarcoides | an ascomycete fungus | 35 | 2023 |
| fungus | Ascodichaena rugosa | an ascomycete fungus | 7 | 2023 |
| fungus | Ascomycota | Ascomycete | 4 | 2023 |
| fungus | Asteroma impressum | a fungus | 1 | 1999 |
| fungus | Asteroma microspermum | a fungus | 2 | 1998 |
| fungus | Asterophora lycoperdoides | a Pick-a-back Toadstool | 2 | 1996 |
| fungus | Asterophora parasitica | a Pick-a-back Toadstool | 4 | 1996 |
| fungus | Astraeus hygrometricus | Barometer Earthstar | 1 | 2008 |
| fungus | Athelia arachnoidea | a basidiomycete fungus | 1 | 2020 |
| fungus | Athelia epiphylla | a basidiomycete fungus | 3 | 2008 |
| fungus | Aurantiporus fissilis | a basidiomycete fungus | 2 | 2014 |
| fungus | Auricularia auricula-judae | Jelly Ear | 778 | 2025 |
| fungus | Auricularia mesenterica | Tripe Fungus | 44 | 2015 |
| fungus | Auriscalpium vulgare | a basidiomycete fungus | 5 | 2010 |
| grasshopper, cricket or true cricket | Acheta domesticus | House Cricket | 3 | 1995 |
| grasshopper, cricket or true cricket | Acrididae | a grasshopper (unidentified) | 186 | 2021 |
| harvestman | Anelasmocephalus cambridgei | a harvestman | 6 | 2018 |
| hornwort | Anthocerophyta | an Anthocerophyta species (unidentified) | 1 | 2000 |
| leech, flatworm or ribbon worm | Alboglossiphonia heteroclita | a leech | 6 | 2013 |
| leech, flatworm or ribbon worm | Amphiporus lactifloreus | a ribbon worm (Nemertinea) | 1 | 1995 |
| leech, flatworm or ribbon worm | Argonemertes dendyi | a flatworm | 1 | 2019 |
| leech, flatworm or ribbon worm | Australoplana alba | Australian Flatworm | 2 | 2015 |
| leech, flatworm or ribbon worm | Australoplana sanguinea | an australian flatworm | 1 | 2018 |
| lichen | Acarospora fuscata | a lichen | 1 | 2011 |
| lichen | Acarospora glaucocarpa | a lichen | 2 | 2005 |
| lichen | Acolium inquinans | a lichen | 1 | 1975 |
| lichen | Acrocordia conoidea | a lichen | 13 | 2018 |
| lichen | Acrocordia salweyi | a lichen | 1 | 1985 |
| lichen | Agonimia tristicula | a lichen | 9 | 2018 |
| lichen | Amandinea punctata | a lichen | 34 | 2020 |
| lichen | Anisomeridium ranunculosporum | a lichen | 1 | 1996 |
| lichen | Anisomeridium viridescens | a lichen | 2 | 2004 |
| lichen | Arthonia cinnabarina | a lichen | 2 | 1998 |
| lichen | Arthonia didyma | a lichen | 1 | 1988 |
| lichen | Arthonia radiata | a lichen | 28 | 2020 |
| lichen | Arthonia spadicea | a lichen | 6 | 2011 |
| lichen | Arthonia vinosa | a lichen | 1 | 1988 |
| lichen | Arthopyrenia analepta | a lichen | 3 | 2014 |
| lichen | Arthopyrenia saxicola | a lichen | 1 | 2018 |
| lichen | Aspicilia caesiocinerea | a lichen | 7 | 2011 |
| lichen | Aspicilia calcarea | a lichen | 46 | 2020 |
| lichen | Aspicilia contorta | a lichen | 1 | 2020 |
| lichen | Aspicilia contorta subsp. contorta | a lichen | 26 | 2018 |
| lichen | Aspicilia contorta subsp. hoffmanniana | a lichen | 4 | 2018 |
| liverwort | Aneura pinguis | Greasewort | 2 | 1992 |
| mammal | Apodemus | an Apodemus species (unidentified) | 3 | 2015 |
| mammal | Apodemus flavicollis | Yellow-necked Mouse | 83 | 2020 |
| mammal | Apodemus sylvaticus | Wood Mouse | 665 | 2025 |
| mammal | Arvicola amphibius | Water Vole | 1327 | 2024 |
| mollusc | Abida secale | Large Chrysalis Snail | 16 | 2012 |
| mollusc | Acanthinula aculeata | Prickly Snail | 7 | 2000 |
| mollusc | Acicula fusca | Point Snail | 3 | 2002 |
| mollusc | Acroloxus lacustris | Lake Limpet | 8 | 2013 |
| mollusc | Adalaria proxima | Yellow False Doris | 1 | 1976 |
| mollusc | Aegopinella nitidula | Smooth Glass Snail | 69 | 2019 |
| mollusc | Aegopinella pura | Clear Glass Snail | 28 | 2020 |
| mollusc | Aeolidia papillosa/filomenae | Grey Sea Slug | 1 | 1976 |
| mollusc | Ambigolimax | a Threeband Slug (unidentified) | 8 | 2023 |
| mollusc | Ambigolimax parvipenis | Balkan Threeband Slug | 1 | 2016 |
| mollusc | Ambigolimax valentianus | Greenhouse Slug | 6 | 2023 |
| mollusc | Ampullaceana balthica | Wandering Snail | 448 | 2024 |
| mollusc | Ancylidae | a freshwater limpet (unidentified) | 17 | 2003 |
| mollusc | Ancylus fluviatilis | River Limpet | 26 | 1998 |
| mollusc | Anisus | an Anisus ramshorn species (unidentified) | 4 | 2016 |
| mollusc | Anisus (Anisus) leucostoma | a ramshorn snail | 70 | 2013 |
| mollusc | Anisus (Disculifer) vortex | Whirlpool Ramshorn | 243 | 2013 |
| mollusc | Anodonta (Anodonta) cygnea | Swan Mussel | 14 | 2022 |
| mollusc | Aplexa hypnorum | a bladder snail | 29 | 2013 |
| mollusc | Arianta arbustorum | Copse Snail | 78 | 2024 |
| mollusc | Arion | an Arion slug (unidentified) | 23 | 2023 |
| mollusc | Arion (Arion) ater | Great Black Slug | 108 | 2021 |
| mollusc | Arion (Arion) flagellus | a roundback slug | 2 | 2018 |
| mollusc | Arion (Arion) rufus | Red slug | 8 | 2023 |
| mollusc | Arion (Arion) vulgaris | Vulgar Slug | 3 | 2013 |
| mollusc | Arion ater agg. | a black slug | 34 | 2023 |
| mollusc | Arion (Carinarion) circumscriptus silvaticus | Silver Slug | 9 | 1999 |
| mollusc | Arion (Carinarion) fasciatus | Bourguignat's Slug | 8 | 2003 |
| mollusc | Arion circumscriptus agg. | a roundback slug | 8 | 2003 |
| mollusc | Arion circumscriptus seg. | Dotted Slug | 1 | 1983 |
| mollusc | Arion hortensis agg. | a mollusc | 10 | 2023 |
| mollusc | Arionidae sp. or Limacidae sp. or Milacidae sp. or testacellidae sp. (unidentified) | a slug (unidentified) | 159 | 2023 |
| mollusc | Arion (Kobeltia) distinctus | Common Garden Slug | 10 | 2018 |
| mollusc | Arion (Kobeltia) hortensis | Southern Garden Slug | 15 | 2023 |
| mollusc | Arion (Kobeltia) intermedius | Hedgehog Slug | 12 | 2002 |
| mollusc | Arion (Kobeltia) owenii | a roundback slug | 4 | 2023 |
| mollusc | Arion (Mesarion) subfuscus | Dusky Slug | 40 | 2020 |
| mollusc | Ashfordia granulata | Silky Snail | 11 | 2018 |
| mollusc | Astarte sulcata | a mollusc | 1 | 1912 |
| mollusc | Atrina fragilis | Fan mussel | 1 | 1912 |
| mollusc | Auriculinella bidentata | Two-toothed White Snail | 4 | 2015 |
| mollusc | Azeca goodalli | Three-toothed Snail | 3 | 2008 |
| moss | Acaulon muticum | Rounded Pygmy-moss | 1 | 1991 |
| moss | Aloina aloides | Common Aloe-moss | 11 | 2023 |
| moss | Aloina ambigua | Tall Aloe-moss | 1 | 1963 |
| moss | Amblystegium confervoides | Tiny Feather-moss | 4 | 1991 |
| moss | Amblystegium serpens | Creeping Feather-moss | 142 | 2023 |
| moss | Amblystegium serpens var. serpens | a creeping feather-moss | 10 | 2011 |
| moss | Anomodon viticulosus | Rambling Tail-moss | 57 | 2023 |
| moss | Aphanorrhegma patens | Spreading Earth-moss | 5 | 2021 |
| moss | Atrichum | an Atrichum species (unidentified) | 2 | 2009 |
| moss | Atrichum undulatum | Common Smoothcap | 88 | 2023 |
| moss | Atrichum undulatum var. undulatum | a common smoothcap | 2 | 1991 |
| moss | Aulacomnium androgynum | Bud-headed Groove-moss | 1 | 2019 |
| moss | Aulacomnium palustre | Bog Groove-moss | 2 | 2007 |
| moth or butterfly - butterfly | Aglais io | Peacock (butterfly) | 21288 | 2025 |
| moth or butterfly - butterfly | Aglais urticae | Small Tortoiseshell | 22857 | 2025 |
| moth or butterfly - butterfly | Anthocharis cardamines | Orange-tip | 9596 | 2025 |
| moth or butterfly - butterfly | Apatura iris | Purple Emperor | 7 | 1999 |
| moth or butterfly - butterfly | Aphantopus hyperantus | Ringlet | 12592 | 2025 |
| moth or butterfly - butterfly | Aporia crataegi | Black-veined White | 1 | 1984 |
| moth or butterfly - butterfly | Argynnis | a Argynnis fritillary butterfly (unidentified) | 4 | 2021 |
| moth or butterfly - butterfly | Argynnis adippe | High Brown Fritillary | 17 | 1992 |
| moth or butterfly - butterfly | Argynnis paphia | Silver-washed Fritillary | 3120 | 2025 |
| moth or butterfly - butterfly | Aricia agestis | Brown Argus | 3457 | 2024 |
| moth or butterfly - macro moth | Abraxas grossulariata | Magpie Moth | 1037 | 2024 |
| moth or butterfly - macro moth | Abraxas sylvata | Clouded Magpie | 171 | 2023 |
| moth or butterfly - macro moth | Abrostola | an Abrostola species (unidentified) | 1 | 2001 |
| moth or butterfly - macro moth | Abrostola tripartita | Spectacle | 2664 | 2025 |
| moth or butterfly - macro moth | Abrostola triplasia | Dark Spectacle | 84 | 2024 |
| moth or butterfly - macro moth | Acasis viretata | Yellow-barred Brindle | 651 | 2024 |
| moth or butterfly - macro moth | Acherontia atropos | Death's Head Hawk-moth | 18 | 2023 |
| moth or butterfly - macro moth | Achlya flavicornis | a moth | 1 | 2009 |
| moth or butterfly - macro moth | Achlya flavicornis galbanus | Yellow Horned | 21 | 2013 |
| moth or butterfly - macro moth | Acronicta | an Acronicta species (unidentified) | 14 | 2019 |
| moth or butterfly - macro moth | Acronicta aceris | Sycamore (moth) | 341 | 2024 |
| moth or butterfly - macro moth | Acronicta alni | Alder Moth | 125 | 2024 |
| moth or butterfly - macro moth | Acronicta leporina | Miller (moth) | 307 | 2024 |
| moth or butterfly - macro moth | Acronicta psi | Grey Dagger | 481 | 2023 |
| moth or butterfly - macro moth | Acronicta psi/tridens | Dark Dagger or Grey Dagger (undetermined) | 1110 | 2025 |
| moth or butterfly - macro moth | Acronicta rumicis | Knot Grass (moth) | 1851 | 2025 |
| moth or butterfly - macro moth | Acronicta tridens | Dark Dagger | 147 | 2022 |
| moth or butterfly - macro moth | Actebia praecox | Portland Moth | 2 | 1964 |
| moth or butterfly - macro moth | Adscita | a burnet moth or forester (unidentified) | 2 | 2007 |
| moth or butterfly - macro moth | Adscita geryon | Cistus Forester | 38 | 2020 |
| moth or butterfly - macro moth | Adscita statices | Forester | 20 | 2016 |
| moth or butterfly - macro moth | Aethalura punctulata | Grey Birch | 35 | 2019 |
| moth or butterfly - macro moth | Agriopis aurantiaria | Scarce Umber | 17 | 2023 |
| moth or butterfly - macro moth | Agriopis leucophaearia | Spring Usher | 33 | 2021 |
| moth or butterfly - macro moth | Agriopis marginaria | Dotted Border | 328 | 2024 |
| moth or butterfly - macro moth | Agrius convolvuli | Convolvulus Hawk-moth | 54 | 2024 |
| moth or butterfly - macro moth | Agrochola circellaris | Brick | 170 | 2024 |
| moth or butterfly - macro moth | Agrochola helvola | Flounced Chestnut | 29 | 2015 |
| moth or butterfly - macro moth | Agrochola litura | Brown-spot Pinion | 275 | 2023 |
| moth or butterfly - macro moth | Agrochola lota | Red-line Quaker | 513 | 2024 |
| moth or butterfly - macro moth | Agrochola lychnidis | Beaded Chestnut | 982 | 2024 |
| moth or butterfly - macro moth | Agrochola macilenta | Yellow-line Quaker | 443 | 2024 |
| moth or butterfly - macro moth | Agrotis cinerea | Light Feathered Rustic | 24 | 2020 |
| moth or butterfly - macro moth | Agrotis clavis | Heart and Club | 2222 | 2025 |
| moth or butterfly - macro moth | Agrotis exclamationis | Heart and Dart | 6735 | 2025 |
| moth or butterfly - macro moth | Agrotis ipsilon | Dark Sword-grass | 752 | 2025 |
| moth or butterfly - macro moth | Agrotis puta | Shuttle-shaped Dart | 5437 | 2025 |
| moth or butterfly - macro moth | Agrotis puta puta | a Shuttle-shaped Dart | 13 | 2024 |
| moth or butterfly - macro moth | Agrotis ripae | Sand Dart | 10 | 2010 |
| moth or butterfly - macro moth | Agrotis segetum | Turnip Moth | 1417 | 2025 |
| moth or butterfly - macro moth | Agrotis trux | a moth | 1 | 2010 |
| moth or butterfly - macro moth | Agrotis trux lunigera | Crescent Dart | 42 | 2024 |
| moth or butterfly - macro moth | Agrotis vestigialis | Archer's Dart | 21 | 2020 |
| moth or butterfly - macro moth | Alcis jubata | Dotted Carpet | 2 | 1947 |
| moth or butterfly - macro moth | Alcis repandata | a moth | 160 | 2024 |
| moth or butterfly - macro moth | Alcis repandata muraria | Mottled Beauty (Scotland, W.Ireland) | 1 | 2023 |
| moth or butterfly - macro moth | Alcis repandata repandata | Mottled Beauty | 963 | 2024 |
| moth or butterfly - macro moth | Allophyes oxyacanthae | Green-brindled Crescent | 424 | 2024 |
| moth or butterfly - macro moth | Alsophila aescularia | March Moth | 718 | 2024 |
| moth or butterfly - macro moth | Amphipoea | an ear moth (unidentified) | 37 | 2023 |
| moth or butterfly - macro moth | Amphipoea fucosa | a moth | 1 | 2003 |
| moth or butterfly - macro moth | Amphipoea fucosa paludis | Saltern Ear | 22 | 2013 |
| moth or butterfly - macro moth | Amphipoea oculea | Ear Moth | 36 | 2022 |
| moth or butterfly - macro moth | Amphipoea oculea agg. | a moth | 8 | 2024 |
| moth or butterfly - macro moth | Amphipyra | an Amphipyra species (unidentified) | 8 | 2022 |
| moth or butterfly - macro moth | Amphipyra berbera | Svensson's Copper Underwing | 130 | 2023 |
| moth or butterfly - macro moth | Amphipyra pyramidea | Copper Underwing | 1209 | 2025 |
| moth or butterfly - macro moth | Amphipyra pyramidea agg. | a copper underwing species | 392 | 2024 |
| moth or butterfly - macro moth | Amphipyra pyramidea/berbera subsp. svenssoni | Copper Underwing or Svensson's Copper Underwing (undetermined) | 441 | 2024 |
| moth or butterfly - macro moth | Amphipyra tragopoginis | Mouse Moth | 488 | 2024 |
| moth or butterfly - macro moth | Anaplectoides prasina | Green Arches | 174 | 2023 |
| moth or butterfly - macro moth | Anarta myrtilli | Beautiful Yellow Underwing | 3 | 1994 |
| moth or butterfly - macro moth | Anarta trifolii | Nutmeg (moth) | 174 | 2024 |
| moth or butterfly - macro moth | Angerona prunaria | Orange Moth | 12 | 2018 |
| moth or butterfly - macro moth | Anorthoa munda | Twin-spotted Quaker | 516 | 2024 |
| moth or butterfly - macro moth | Antheraea sp. | an Antheraea species (unidentified) | 2 | 2013 |
| moth or butterfly - macro moth | Anticlea derivata | Streamer | 297 | 2024 |
| moth or butterfly - macro moth | Anticollix sparsata | Dentated Pug | 1 | 2009 |
| moth or butterfly - macro moth | Antitype chi | Grey Chi | 36 | 2014 |
| moth or butterfly - macro moth | Apamea anceps | Large Nutmeg | 89 | 2024 |
| moth or butterfly - macro moth | Apamea crenata | Clouded-bordered Brindle | 559 | 2024 |
| moth or butterfly - macro moth | Apamea crenata ab. combusta | a combusta abberation of Clouded-bordered Brindle | 1 | 2020 |
| moth or butterfly - macro moth | Apamea epomidion | Clouded Brindle | 224 | 2024 |
| moth or butterfly - macro moth | Apamea furva | Confused | 2 | 2006 |
| moth or butterfly - macro moth | Apamea furva subsp. britannica | a moth | 5 | 1979 |
| moth or butterfly - macro moth | Apamea lithoxylaea | Light Arches | 985 | 2024 |
| moth or butterfly - macro moth | Apamea monoglypha | Dark Arches | 5048 | 2025 |
| moth or butterfly - macro moth | Apamea oblonga | Crescent Striped | 7 | 2004 |
| moth or butterfly - macro moth | Apamea remissa | Dusky Brocade | 183 | 2023 |
| moth or butterfly - macro moth | Apamea scolopacina | Slender Brindle | 106 | 2023 |
| moth or butterfly - macro moth | Apamea sordens | Rustic Shoulder-knot | 794 | 2024 |
| moth or butterfly - macro moth | Apamea sublustris | Reddish Light Arches | 52 | 2024 |
| moth or butterfly - macro moth | Apamea unanimis | Small Clouded Brindle | 125 | 2023 |
| moth or butterfly - macro moth | Apeira syringaria | Lilac Beauty | 87 | 2022 |
| moth or butterfly - macro moth | Aplocera | an Aplocera species (unidentified) | 3 | 2021 |
| moth or butterfly - macro moth | Aplocera efformata | Lesser Treble-bar | 21 | 2016 |
| moth or butterfly - macro moth | Aplocera plagiata | a moth | 38 | 2025 |
| moth or butterfly - macro moth | Aplocera plagiata plagiata | Treble-bar | 222 | 2023 |
| moth or butterfly - macro moth | Apocheima hispidaria | Small Brindled Beauty | 19 | 2020 |
| moth or butterfly - macro moth | Apoda limacodes | Festoon | 2 | 1997 |
| moth or butterfly - macro moth | Aporophyla lutulenta | Deep-brown Dart | 46 | 2023 |
| moth or butterfly - macro moth | Aporophyla nigra | Black Rustic | 1093 | 2024 |
| moth or butterfly - macro moth | Apterogenum ypsillon | Dingy Shears | 162 | 2024 |
| moth or butterfly - macro moth | Archanara | an Archanara moth species (unidentified) | 1 | 2007 |
| moth or butterfly - macro moth | Archanara dissoluta | Brown-veined Wainscot | 43 | 2024 |
| moth or butterfly - macro moth | Archiearis | an orange underwing (unidentified) | 1 | 1992 |
| moth or butterfly - macro moth | Archiearis parthenias | Orange Underwing | 24 | 2016 |
| moth or butterfly - macro moth | Arctia caja | Garden Tiger | 775 | 2025 |
| moth or butterfly - macro moth | Arctia villica | a moth | 17 | 2011 |
| moth or butterfly - macro moth | Arctia villica britannica | Cream-spot Tiger | 91 | 2018 |
| moth or butterfly - macro moth | Arctiinae | an Arctiidae species (unidentified) | 3 | 2015 |
| moth or butterfly - macro moth | Arenostola phragmitidis | Fen Wainscot | 1 | 2018 |
| moth or butterfly - macro moth | Aspitates gilvaria gilvaria | Straw Belle | 1 | 1961 |
| moth or butterfly - macro moth | Aspitates ochrearia | Yellow Belle | 13 | 2021 |
| moth or butterfly - macro moth | Asteroscopus sphinx | Sprawler | 29 | 2023 |
| moth or butterfly - macro moth | Asthena albulata | Small White Wave | 186 | 2023 |
| moth or butterfly - macro moth | Atethmia centrago | Centre-barred Sallow | 599 | 2024 |
| moth or butterfly - macro moth | Athetis hospes | Porter's Rustic | 2 | 2023 |
| moth or butterfly - macro moth | Atolmis rubricollis | Red-necked Footman | 54 | 2024 |
| moth or butterfly - macro moth | Autographa bractea | Gold Spangle | 2 | 1992 |
| moth or butterfly - macro moth | Autographa gamma | Silver Y | 6508 | 2025 |
| moth or butterfly - macro moth | Autographa jota | Plain Golden Y | 481 | 2024 |
| moth or butterfly - macro moth | Autographa pulchrina | Beautiful Golden Y | 357 | 2024 |
| moth or butterfly - macro moth | Axylia putris | Flame | 2743 | 2024 |
| moth or butterfly - micro moth | Acentria ephemerella | Water Veneer | 559 | 2024 |
| moth or butterfly - micro moth | Achroia grisella | Lesser Wax Moth | 45 | 2024 |
| moth or butterfly - micro moth | Acleris | an Acleris species (unidentified) | 22 | 2023 |
| moth or butterfly - micro moth | Acleris aspersana | a tortrix moth | 31 | 2023 |
| moth or butterfly - micro moth | Acleris bergmanniana | Yellow Rose Button | 28 | 2017 |
| moth or butterfly - micro moth | Acleris comariana | Strawberry Tortrix | 104 | 2023 |
| moth or butterfly - micro moth | Acleris cristana | a tortrix moth | 45 | 2023 |
| moth or butterfly - micro moth | Acleris emargana | Notch Wing Tortix | 31 | 2022 |
| moth or butterfly - micro moth | Acleris ferrugana | a tortrix moth | 52 | 2023 |
| moth or butterfly - micro moth | Acleris ferrugana/notana | a moth | 20 | 2025 |
| moth or butterfly - micro moth | Acleris forsskaleana | Maple Button | 298 | 2024 |
| moth or butterfly - micro moth | Acleris hastiana | a tortrix moth | 16 | 2023 |
| moth or butterfly - micro moth | Acleris holmiana | a tortrix moth | 22 | 2020 |
| moth or butterfly - micro moth | Acleris hyemana | a tortrix moth | 2 | 2003 |
| moth or butterfly - micro moth | Acleris kochiella | a tortrix moth | 13 | 2023 |
| moth or butterfly - micro moth | Acleris laterana | Dark-triangle Button | 187 | 2024 |
| moth or butterfly - micro moth | Acleris laterana/comariana | a tortrix moth | 20 | 2023 |
| moth or butterfly - micro moth | Acleris literana | a tortrix moth | 34 | 2023 |
| moth or butterfly - micro moth | Acleris logiana | a tortrix moth | 1 | 2012 |
| moth or butterfly - micro moth | Acleris notana | a tortrix moth | 20 | 2013 |
| moth or butterfly - micro moth | Acleris rhombana | Rhomboid Tortrix | 47 | 2022 |
| moth or butterfly - micro moth | Acleris schalleriana | a tortrix moth | 57 | 2024 |
| moth or butterfly - micro moth | Acleris sparsana | a tortrix moth | 92 | 2024 |
| moth or butterfly - micro moth | Acleris umbrana | a tortrix moth | 46 | 2023 |
| moth or butterfly - micro moth | Acleris variegana | Garden Rose Tortrix | 490 | 2024 |
| moth or butterfly - micro moth | Acompsia cinerella | a micro-moth | 5 | 2005 |
| moth or butterfly - micro moth | Acompsia schmidtiellus | a micro-moth | 6 | 2022 |
| moth or butterfly - micro moth | Acrobasis | an Acrobasis species (unidentified) | 5 | 2023 |
| moth or butterfly - micro moth | Acrobasis advenella | Grey Knot-horn | 634 | 2024 |
| moth or butterfly - micro moth | Acrobasis consociella | a pyralid moth | 44 | 2023 |
| moth or butterfly - micro moth | Acrobasis marmorea | a pyralid moth | 9 | 2023 |
| moth or butterfly - micro moth | Acrobasis repandana | a pyralid moth | 30 | 2023 |
| moth or butterfly - micro moth | Acrobasis suavella | a pyralid moth | 100 | 2024 |
| moth or butterfly - micro moth | Acrocercops brongniardella | a micro-moth | 28 | 2023 |
| moth or butterfly - micro moth | Acrolepia autumnitella | a micro-moth | 43 | 2021 |
| moth or butterfly - micro moth | Acrolepiopsis assectella | Leek Moth | 171 | 2023 |
| moth or butterfly - micro moth | Adaina microdactyla | a plume moth | 50 | 2022 |
| moth or butterfly - micro moth | Adela | an Adela species (unidentified) | 1 | 2011 |
| moth or butterfly - micro moth | Adela croesella | a longhorn moth | 22 | 2022 |
| moth or butterfly - micro moth | Adela cuprella | a longhorn moth | 2 | 1997 |
| moth or butterfly - micro moth | Adela reaumurella | Green Long-horn | 240 | 2024 |
| moth or butterfly - micro moth | Adoxophyes orana | Summer Fruit Tortrix | 1 | 2020 |
| moth or butterfly - micro moth | Aethes beatricella | a micro-moth | 29 | 2024 |
| moth or butterfly - micro moth | Aethes cnicana | Thistle Conch | 29 | 2022 |
| moth or butterfly - micro moth | Aethes francillana | a micro-moth | 10 | 2020 |
| moth or butterfly - micro moth | Aethes hartmanniana | a micro-moth | 7 | 2003 |
| moth or butterfly - micro moth | Aethes piercei | a micro-moth | 3 | 1991 |
| moth or butterfly - micro moth | Aethes rubigana | a micro-moth | 57 | 2023 |
| moth or butterfly - micro moth | Aethes smeathmanniana | a micro-moth | 47 | 2024 |
| moth or butterfly - micro moth | Aethes tesserana | a micro-moth | 7 | 2014 |
| moth or butterfly - micro moth | Aethes williana | a micro-moth | 1 | 1906 |
| moth or butterfly - micro moth | Agapeta hamana | Common Yellow Conch | 857 | 2025 |
| moth or butterfly - micro moth | Agapeta zoegana | a micro-moth | 86 | 2023 |
| moth or butterfly - micro moth | Agdistis meridionalis | a plume moth | 2 | 1992 |
| moth or butterfly - micro moth | Aglossa pinguinalis | Large Tabby | 66 | 2023 |
| moth or butterfly - micro moth | Agnoea flavifrontella | a micro-moth | 1 | 1963 |
| moth or butterfly - micro moth | Agnoea josephinae | a micro-moth | 8 | 2024 |
| moth or butterfly - micro moth | Agonopterix | an Agonopterix species (unidentified) | 13 | 2023 |
| moth or butterfly - micro moth | Agonopterix alstromeriana | Brown-spot Flat-body | 198 | 2024 |
| moth or butterfly - micro moth | Agonopterix angelicella | a micro-moth | 2 | 1993 |
| moth or butterfly - micro moth | Agonopterix arenella | a micro-moth | 214 | 2024 |
| moth or butterfly - micro moth | Agonopterix assimilella | a micro-moth | 1 | 2009 |
| moth or butterfly - micro moth | Agonopterix ciliella | a micro-moth | 16 | 2011 |
| moth or butterfly - micro moth | Agonopterix conterminella | a micro-moth | 1 | 1995 |
| moth or butterfly - micro moth | Agonopterix heracliana | Common Flat-body | 250 | 2024 |
| moth or butterfly - micro moth | Agonopterix kaekeritziana | a micro-moth | 2 | 1998 |
| moth or butterfly - micro moth | Agonopterix liturosa | a micro-moth | 5 | 2011 |
| moth or butterfly - micro moth | Agonopterix nanatella | a micro-moth | 3 | 2018 |
| moth or butterfly - micro moth | Agonopterix nervosa | Dark-fringed Flat-body | 13 | 2012 |
| moth or butterfly - micro moth | Agonopterix ocellana | Red-letter Flat-body | 7 | 2023 |
| moth or butterfly - micro moth | Agonopterix propinquella | a micro-moth | 5 | 2015 |
| moth or butterfly - micro moth | Agonopterix purpurea | a micro-moth | 16 | 2023 |
| moth or butterfly - micro moth | Agonopterix scopariella | a micro-moth | 2 | 2011 |
| moth or butterfly - micro moth | Agonopterix subpropinquella | Ruddy Flat-body | 22 | 2019 |
| moth or butterfly - micro moth | Agonopterix yeatiana | a micro-moth | 17 | 2023 |
| moth or butterfly - micro moth | Agriphila | an Agriphila species (unidentified) | 39 | 2013 |
| moth or butterfly - micro moth | Agriphila geniculea | a pyralid moth | 1012 | 2024 |
| moth or butterfly - micro moth | Agriphila inquinatella | a pyralid moth | 54 | 2023 |
| moth or butterfly - micro moth | Agriphila latistria | a pyralid moth | 23 | 2023 |
| moth or butterfly - micro moth | Agriphila selasella | a pyralid moth | 130 | 2024 |
| moth or butterfly - micro moth | Agriphila straminella | Straw Grass-veneer | 1855 | 2025 |
| moth or butterfly - micro moth | Agriphila tristella | Common Grass-veneer | 2322 | 2025 |
| moth or butterfly - micro moth | Agrotera nemoralis | Beautiful Pearl | 1 | 1851 |
| moth or butterfly - micro moth | Alabonia geoffrella | a micro-moth | 91 | 2025 |
| moth or butterfly - micro moth | Aleimma loeflingiana | Yellow Oak Button | 93 | 2023 |
| moth or butterfly - micro moth | Altenia scriptella | a micro-moth | 4 | 2011 |
| moth or butterfly - micro moth | Alucita hexadactyla | Twenty-plume Moth | 978 | 2024 |
| moth or butterfly - micro moth | Amblyptilia | an Amblyptilia species (unidentified) | 22 | 2009 |
| moth or butterfly - micro moth | Amblyptilia acanthadactyla | a plume moth | 879 | 2025 |
| moth or butterfly - micro moth | Amblyptilia punctidactyla | a plume moth | 35 | 2021 |
| moth or butterfly - micro moth | Anacampsis | an Anacampsis species (unidentified) | 1 | 2005 |
| moth or butterfly - micro moth | Anacampsis blattariella | a micro-moth | 6 | 2014 |
| moth or butterfly - micro moth | Anacampsis populella | a micro-moth | 17 | 2016 |
| moth or butterfly - micro moth | Anania | an Anania species (unidentified) | 1 | 2015 |
| moth or butterfly - micro moth | Anania coronata | a pyralid moth | 1345 | 2024 |
| moth or butterfly - micro moth | Anania crocealis | a pyralid moth | 52 | 2023 |
| moth or butterfly - micro moth | Anania funebris | White-spotted Sable Moth | 1 | 2009 |
| moth or butterfly - micro moth | Anania fuscalis | a pyralid moth | 43 | 2023 |
| moth or butterfly - micro moth | Anania hortulata | Small Magpie | 2915 | 2025 |
| moth or butterfly - micro moth | Anania lancealis | a pyralid moth | 134 | 2024 |
| moth or butterfly - micro moth | Anania perlucidalis | a pyralid moth | 22 | 2022 |
| moth or butterfly - micro moth | Anania stachydalis | a pyralid moth | 1 | 2011 |
| moth or butterfly - micro moth | Anarsia innoxiella | an Anarsia moth | 2 | 2021 |
| moth or butterfly - micro moth | Anarsia spartiella | a micro-moth | 3 | 2020 |
| moth or butterfly - micro moth | Ancylis achatana | a tortrix moth | 325 | 2024 |
| moth or butterfly - micro moth | Ancylis badiana | Common Roller | 142 | 2023 |
| moth or butterfly - micro moth | Ancylis comptana | a tortrix moth | 28 | 2024 |
| moth or butterfly - micro moth | Ancylis diminutana | a tortrix moth | 4 | 2009 |
| moth or butterfly - micro moth | Ancylis geminana | a tortrix moth | 1 | 1994 |
| moth or butterfly - micro moth | Ancylis laetana | a tortrix moth | 2 | 2017 |
| moth or butterfly - micro moth | Ancylis mitterbacheriana | Red Roller | 8 | 2024 |
| moth or butterfly - micro moth | Ancylis obtusana | a tortrix moth | 5 | 2010 |
| moth or butterfly - micro moth | Ancylosis oblitella | a pyralid moth | 2 | 1996 |
| moth or butterfly - micro moth | Anthophila fabriciana | Nettle-tap | 560 | 2025 |
| moth or butterfly - micro moth | Antispila | an Antispila species (unidentified) | 1 | 2019 |
| moth or butterfly - micro moth | Antispila metallella | a micro-moth | 23 | 2022 |
| moth or butterfly - micro moth | Antispila treitschkiella | a micro-moth | 19 | 2022 |
| moth or butterfly - micro moth | Aphelia paleana | Timothy Tortrix | 64 | 2024 |
| moth or butterfly - micro moth | Aphelia unitana | a tortrix moth | 1 | 2010 |
| moth or butterfly - micro moth | Aphelia viburnana | Bilberry Tortrix | 2 | 2011 |
| moth or butterfly - micro moth | Aphomia sociella | Bee Moth | 1411 | 2025 |
| moth or butterfly - micro moth | Apodia bifractella | a micro-moth | 17 | 2019 |
| moth or butterfly - micro moth | Apomyelois bistriatella subsp. subcognata | a pyralid moth | 2 | 2000 |
| moth or butterfly - micro moth | Apotomis | an Apotomis species (unidentified) | 1 | 2020 |
| moth or butterfly - micro moth | Apotomis betuletana | Birch Marble | 39 | 2018 |
| moth or butterfly - micro moth | Apotomis capreana | a tortrix moth | 16 | 2019 |
| moth or butterfly - micro moth | Apotomis turbidana | a tortrix moth | 13 | 2019 |
| moth or butterfly - micro moth | Aproaerema | an Aproaerema species (unidentified) | 3 | 2024 |
| moth or butterfly - micro moth | Aproaerema anthyllidella | a micro-moth | 25 | 2023 |
| moth or butterfly - micro moth | Aproaerema cinctella | White-streak Sober | 2 | 2022 |
| moth or butterfly - micro moth | Archips | an Archips species (unidentified) | 1 | 2017 |
| moth or butterfly - micro moth | Archips crataegana | a tortrix moth | 18 | 2020 |
| moth or butterfly - micro moth | Archips podana | Large Fruit-tree Tortrix | 424 | 2024 |
| moth or butterfly - micro moth | Archips rosana | Rose Tortrix | 1 | 1993 |
| moth or butterfly - micro moth | Archips xylosteana | Variegated Golden Tortrix | 31 | 2020 |
| moth or butterfly - micro moth | Argolamprotes micella | a micro-moth | 4 | 2024 |
| moth or butterfly - micro moth | Argyresthia | an Argyresthia species (unidentified) | 2 | 2022 |
| moth or butterfly - micro moth | Argyresthia albistria | Purple Argent | 31 | 2022 |
| moth or butterfly - micro moth | Argyresthia bonnetella | Hawthorn Argent | 89 | 2022 |
| moth or butterfly - micro moth | Argyresthia brockeella | a micro-moth | 37 | 2022 |
| moth or butterfly - micro moth | Argyresthia conjugella | Apple Fruit Moth | 5 | 2020 |
| moth or butterfly - micro moth | Argyresthia cupressella | a moth | 82 | 2023 |
| moth or butterfly - micro moth | Argyresthia curvella | a moth | 11 | 2015 |
| moth or butterfly - micro moth | Argyresthia dilectella | a micro-moth | 6 | 2017 |
| moth or butterfly - micro moth | Argyresthia glaucinella | a micro-moth | 2 | 2000 |
| moth or butterfly - micro moth | Argyresthia goedartella | Golden Argent | 187 | 2023 |
| moth or butterfly - micro moth | Argyresthia ivella | a micro-moth | 7 | 2011 |
| moth or butterfly - micro moth | Argyresthia laevigatella | a micro-moth | 1 | 1993 |
| moth or butterfly - micro moth | Argyresthia pruniella | Cherry Fruit Moth | 93 | 2023 |
| moth or butterfly - micro moth | Argyresthia pygmaeella | a micro-moth | 2 | 2016 |
| moth or butterfly - micro moth | Argyresthia retinella | a micro-moth | 14 | 2020 |
| moth or butterfly - micro moth | Argyresthia semifusca | a micro-moth | 19 | 2020 |
| moth or butterfly - micro moth | Argyresthia semitestacella | a micro-moth | 7 | 2021 |
| moth or butterfly - micro moth | Argyresthia sorbiella | a micro-moth | 6 | 2010 |
| moth or butterfly - micro moth | Argyresthia spinosella | a micro-moth | 43 | 2023 |
| moth or butterfly - micro moth | Argyresthia trifasciata | a micro-moth | 46 | 2022 |
| moth or butterfly - micro moth | Aristotelia ericinella | a micro-moth | 14 | 2016 |
| moth or butterfly - micro moth | Aspilapteryx tringipennella | Ribwort Slender | 133 | 2024 |
| moth or butterfly - micro moth | Assara terebrella | a pyralid moth | 4 | 2024 |
| moth or butterfly - micro moth | Athrips mouffetella | a micro-moth | 19 | 2013 |
| plant | Abies | an Abies species (unidentified) | 2 | 2011 |
| plant | Abies alba | European Silver-fir | 2 | 2020 |
| plant | Abies grandis | Giant Fir | 8 | 2023 |
| plant | Abies koreana | Korean Fir | 3 | 2000 |
| plant | Abies nordmanniana | Caucasian Fir | 5 | 2009 |
| plant | Abutilon theophrasti | Velvetleaf | 3 | 2019 |
| plant | Acacia | an Acacia species (unidentified) | 2 | 2011 |
| plant | Acaena novae-zelandiae | Pirri-pirri-bur | 3 | 2010 |
| plant | Acanthus mollis | Bear's-breech | 11 | 2022 |
| plant | Acanthus spinosus | Spiny Bear's-breech | 12 | 2018 |
| plant | Acer | a maple (unidentified) | 706 | 2024 |
| plant | Acer campestre | Field Maple | 9346 | 2024 |
| plant | Acer capillipes | Red Snakebark Maple | 1 | 1987 |
| plant | Acer cappadocicum | Cappadocian Maple | 29 | 2016 |
| plant | Acer davidii | Snakebark Maple | 19 | 2000 |
| plant | Acer griseum | Paperbark Maple | 13 | 2016 |
| plant | Acer japonicum | Downy Japanese-maple | 9 | 2000 |
| plant | Acer negundo | Ashleaf Maple | 54 | 2023 |
| plant | Acer nikoense | Nikko Maple | 1 | 2011 |
| plant | Acer opalus | Italian Maple | 2 | 2015 |
| plant | Acer palmatum | Purple Japanese-maple | 42 | 2019 |
| plant | Acer platanoides | Norway Maple | 1041 | 2024 |
| plant | Acer platanoides 'Drummondii' | Variegated Norway-maple | 1 | 1999 |
| plant | Acer platanoides 'Schwedleri' | Purple Norway-maple | 1 | 1999 |
| plant | Acer pseudoplatanus | Sycamore (tree) | 6862 | 2024 |
| plant | Acer pseudoplatanus 'Brilliantissimum' | Brilliant Sycamore | 1 | 1999 |
| plant | Acer pseudoplatanus forma purpureum | Purple Sycamore | 18 | 2016 |
| plant | Acer rubrum | Red Maple | 5 | 2016 |
| plant | Acer saccharinum | Silver Maple | 87 | 2022 |
| plant | Acer sempervirens | Cretan Maple | 1 | 2005 |
| plant | Acer tataricum | Tatar Maple | 3 | 2000 |
| plant | Achillea | an Achillea species (unidentified) | 3 | 2023 |
| plant | Achillea distans | Tall Yarrow | 1 | 1997 |
| plant | Achillea millefolium | Yarrow | 6479 | 2024 |
| plant | Achillea nobilis | a yarrow | 2 | 1933 |
| plant | Achillea ptarmica | Sneezewort | 192 | 2024 |
| plant | Aconitum napellus | Monk's-Hood | 20 | 2016 |
| plant | Aconitum napellus (sensu lato) | a monk's-hood | 1 | 2015 |
| plant | Acorus calamus | Sweet-flag | 11 | 2022 |
| plant | Adiantum | an Adiantum species (unidentified) | 2 | 2008 |
| plant | Adiantum capillus-veneris | Maidenhair Fern | 30 | 2019 |
| plant | Adonis aestivalis | Summer Pheasant's-eye | 2 | 1940 |
| plant | Adonis annua | Pheasant's-eye | 2 | 1939 |
| plant | Adoxa moschatellina | Moschatel | 1006 | 2024 |
| plant | Aegilops cylindrica | a flowering plant | 4 | 1934 |
| plant | Aegilops neglecta | a flowering plant | 2 | 1937 |
| plant | Aegilops speltoides | a flowering plant | 3 | 1953 |
| plant | Aegilops triuncialis | a flowering plant | 1 | 1939 |
| plant | Aegopodium podagraria | Ground-elder | 1948 | 2024 |
| plant | Aesculus carnea | Red Horse-chestnut | 32 | 2023 |
| plant | Aesculus flava | Yellow Buckeye | 6 | 2015 |
| plant | Aesculus hippocastanum | Horse-chestnut (tree) | 2863 | 2024 |
| plant | Aesculus hippocastanum x pavia | a horse-chestnut | 1 | 1998 |
| plant | Aesculus indica | Indian Horse-chestnut | 6 | 2018 |
| plant | Aesculus turbinata | Japanese Chestnut | 1 | 2015 |
| plant | Aethusa cynapium | Fool's Parsley | 338 | 2024 |
| plant | Aethusa cynapium subsp. cynapium | a fool's parsley | 436 | 2000 |
| plant | Agapanthus | an african lily (unidentified) | 3 | 2022 |
| plant | Agrimonia eupatoria | Agrimony | 3418 | 2024 |
| plant | Agrimonia procera | Fragrant Agrimony | 4 | 1991 |
| plant | Agrostemma githago | Corncockle | 28 | 2023 |
| plant | Agrostis | a bent-grass (unidentified) | 81 | 2022 |
| plant | Agrostis canina | Velvet Bent | 291 | 2019 |
| plant | Agrostis capillaris | Common Bent | 2673 | 2024 |
| plant | Agrostis gigantea | Black Bent | 254 | 2022 |
| plant | Agrostis stolonifera | Creeping Bent | 3667 | 2024 |
| plant | Agrostis vinealis | Brown Bent | 78 | 2019 |
| plant | Ailanthus altissima | Tree-of-heaven | 38 | 2022 |
| plant | Aira caryophyllea | Silver Hair-grass | 147 | 2018 |
| plant | Aira praecox | Early Hair-grass | 116 | 2016 |
| plant | Ajuga | an Ajuga species (unidentified) | 1 | 2024 |
| plant | Ajuga reptans | Bugle | 2312 | 2025 |
| plant | Alcea rosea | Hollyhock | 36 | 2020 |
| plant | Alchemilla | a lady's-mantle (unidentified) | 4 | 2023 |
| plant | Alchemilla conjuncta | Silver Lady's-mantle | 1 | 2013 |
| plant | Alchemilla filicaulis | a lady's-mantle | 4 | 2018 |
| plant | Alchemilla filicaulis subsp. vestita | a lady's-mantle | 72 | 2018 |
| plant | Alchemilla glabra | Smooth Lady's-mantle | 1 | 2017 |
| plant | Alchemilla mollis | Garden Lady's-mantle | 63 | 2021 |
| plant | Alchemilla vulgaris agg. | Lady's-mantle | 38 | 2015 |
| plant | Alisma | an Alisma species (unidentified) | 16 | 2020 |
| plant | Alisma lanceolatum | Narrow-leaved Water-plantain | 88 | 2019 |
| plant | Alisma plantago-aquatica | Water-plantain | 1295 | 2024 |
| plant | Alisma plantago-aquatica x lanceolatum = A. x rhicnocarpum | a water-plantain | 2 | 2000 |
| plant | Alliaria petiolata | Garlic Mustard | 5320 | 2025 |
| plant | Allium | an onion (unidentified) | 48 | 2023 |
| plant | Allium ampeloprasum | Wild Leek | 60 | 2022 |
| plant | Allium carinatum | Keeled Garlic | 95 | 2019 |
| plant | Allium cepa | Onion | 1 | 2012 |
| plant | Allium cristophii | Persian Onion | 1 | 2016 |
| plant | Allium moly | Yellow Garlic | 1 | 2013 |
| plant | Allium nigrum | Broad-leaved Onion | 5 | 2018 |
| plant | Allium oleraceum | Field Garlic | 72 | 2019 |
| plant | Allium paradoxum | Few-flowered Garlic | 57 | 2023 |
| plant | Allium porrum | Leek | 1 | 1998 |
| plant | Allium roseum | Rosy Garlic | 68 | 2023 |
| plant | Allium roseum var. bulbiferum | a flowering plant | 1 | 1954 |
| plant | Allium sativum | a flowering plant | 9 | 2025 |
| plant | Allium schoenoprasum | Chives | 33 | 2024 |
| plant | Allium sphaerocephalon | Round-headed Leek | 68 | 2019 |
| plant | Allium subhirsutum | Hairy Garlic | 5 | 2019 |
| plant | Allium triquetrum | Three-cornered Garlic | 188 | 2023 |
| plant | Allium tuberosum | a flowering plant | 1 | 2006 |
| plant | Allium ursinum | Ramsons | 2758 | 2025 |
| plant | Allium vineale | Wild Onion | 2212 | 2025 |
| plant | Alnus | an Alnus species (unidentified) | 18 | 2024 |
| plant | Alnus cordata | Italian Alder | 141 | 2023 |
| plant | Alnus glutinosa | Alder | 2148 | 2025 |
| plant | Alnus glutinosa laciniata | Cut Leaved Alder | 1 | 2015 |
| plant | Alnus incana | Grey Alder | 107 | 2023 |
| plant | Alnus rubra | Red Alder | 1 | 2015 |
| plant | Alnus viridis | Green Alder | 1 | 2013 |
| plant | Alopecurus | a foxtail or Black Grass (unidentified) | 8 | 2023 |
| plant | Alopecurus aequalis | Orange Foxtail | 4 | 2015 |
| plant | Alopecurus bulbosus | Bulbous Foxtail | 129 | 2019 |
| plant | Alopecurus geniculatus | Marsh Foxtail | 744 | 2024 |
| plant | Alopecurus geniculatus x bulbosus = A. x plettkei | a foxtail | 4 | 2008 |
| plant | Alopecurus myosuroides | Black-grass | 432 | 2021 |
| plant | Alopecurus pratensis | Meadow Foxtail | 2783 | 2024 |
| plant | Alopecurus pratensis x geniculatus = A. x brachystylus | a foxtail | 5 | 2009 |
| plant | Alternanthera ficoidea | Joseph's Coat | 2 | 1927 |
| plant | Althaea officinalis | Marsh-mallow | 36 | 2023 |
| plant | Alyssum alyssoides | Small Alison | 2 | 2005 |
| plant | Alyssum saxatile | Golden Alyssum | 3 | 2012 |
| plant | Amaranthus | an Amaranthus species (unidentified) | 1 | 1938 |
| plant | Amaranthus albus | White Pigweed | 13 | 2005 |
| plant | Amaranthus blitoides | Prostrate Pigweed | 2 | 1940 |
| plant | Amaranthus blitum | Guernsey Pigweed | 7 | 2003 |
| plant | Amaranthus bouchonii | Indehiscent Amaranth | 1 | 1992 |
| plant | Amaranthus caudatus | Love-lies-bleeding | 3 | 2003 |
| plant | Amaranthus cruentus | Purple Amaranth | 9 | 1992 |
| plant | Amaranthus deflexus | Perennial Pigweed | 3 | 2014 |
| plant | Amaranthus graecizans | Short-tepalled Pigweed | 5 | 1961 |
| plant | Amaranthus graecizans subsp. sylvestris | a pigweed | 3 | 1961 |
| plant | Amaranthus hybridus | Green Pigweed | 12 | 2016 |
| plant | Amaranthus palmeri | Dioecious Amaranth | 14 | 1961 |
| plant | Amaranthus powellii | a flowering plant | 1 | 2003 |
| plant | Amaranthus quitensis | Mucronate Amaranth | 6 | 1941 |
| plant | Amaranthus retroflexus | Common Amaranth | 36 | 2017 |
| plant | Amaranthus spinosus | Spiny Amaranth | 1 | 1926 |
| plant | Amaranthus standleyanus | Indehiscent Pigweed | 4 | 1940 |
| plant | Amaranthus tuberculatus | Roughfruit Amaranth | 3 | 1959 |
| plant | Amaranthus viridis | Green Amaranth | 8 | 1959 |
| plant | Amaranthus watsonii | Watson's Amaranth | 5 | 1961 |
| plant | Ambrosia artemisiifolia | Ragweed | 13 | 2016 |
| plant | Ambrosia trifida | Giant Ragweed | 4 | 1930 |
| plant | Amelanchier | an Amelanchier tree or shrub (unidentified) | 1 | 2004 |
| plant | Amelanchier lamarckii | Juneberry | 53 | 2019 |
| plant | Amethystea caerulea | Indian Gems | 1 | 1930 |
| plant | Ammi majus | Bullwort | 16 | 2019 |
| plant | Ammi visnaga | Toothpick-plant | 2 | 1992 |
| plant | Ammophila arenaria | Marram | 34 | 2019 |
| plant | Amsinckia micrantha | Common Fiddleneck | 4 | 1999 |
| plant | Anacamptis morio | Green-winged Orchid | 423 | 2024 |
| plant | Anacamptis pyramidalis | Pyramidal Orchid | 946 | 2024 |
| plant | Anacyclus clavatus | a flowering plant | 1 | 1926 |
| plant | Anacyclus valentinus | a flowering plant | 2 | 1928 |
| plant | Anagallis arvensis | Scarlet Pimpernel | 624 | 2024 |
| plant | Anagallis arvensis arvensis lilacina | a flowering plant | 1 | 2015 |
| plant | Anagallis arvensis subsp. arvensis | a scarlet pimpernel | 851 | 2017 |
| plant | Anagallis arvensis subsp. foemina | Blue Pimpernel | 5 | 2014 |
| plant | Anagallis tenella | Bog Pimpernel | 107 | 2018 |
| plant | Anaphalis margaritacea | Pearly Everlasting | 12 | 2012 |
| plant | Anchusa arvensis | Bugloss | 62 | 2019 |
| plant | Anchusa azurea | Garden Anchusa | 3 | 2018 |
| plant | Anchusa ochroleuca | Yellow Alkanet | 1 | 2013 |
| plant | Anchusa officinalis | Alkanet | 14 | 2024 |
| plant | Anchusa stylosa | a flowering plant | 1 | 1939 |
| plant | Anchusa undulata | a flowering plant | 2 | 1940 |
| plant | Androsace maxima | Greater Rockjasmine | 1 | 1937 |
| plant | Anemanthele lessoniana | New Zealand Wind-grass | 6 | 2020 |
| plant | Anemone | an Anemone species (unidentified) | 3 | 2023 |
| plant | Anemone apennina | Blue Anemone | 14 | 2018 |
| plant | Anemone blanda | Balkan Anemone | 12 | 2023 |
| plant | Anemone coronaria | an anemone | 1 | 2023 |
| plant | Anemone hupehensis x vitifolia = A. x hybrida | Japanese Anemone | 25 | 2016 |
| plant | Anemone nemorosa | Wood Anemone | 1498 | 2025 |
| plant | Anethum graveolens | Dill | 1 | 1935 |
| plant | Angelica | an Angelica species (unidentified) | 11 | 2018 |
| plant | Angelica archangelica | Garden Angelica | 4 | 2023 |
| plant | Angelica sylvestris | Wild Angelica | 2602 | 2024 |
| plant | Anoda cristata | Spurred Anoda | 3 | 1939 |
| plant | Anthemis arvensis | Corn Chamomile | 14 | 2023 |
| plant | Anthemis austriaca | a flowering plant | 3 | 2023 |
| plant | Anthemis cotula | Stinking Chamomile | 87 | 2010 |
| plant | Anthemis punctata subsp. cupaniana | a flowering plant | 1 | 2016 |
| plant | Anthemis ruthenica | a flowering plant | 3 | 1935 |
| plant | Anthemis tinctoria | Yellow Chamomile | 4 | 2000 |
| plant | Anthemis wiedemanniana | a flowering plant | 2 | 1939 |
| plant | Anthoxanthum | an Anthoxanthum species (unidentified) | 1 | 2013 |
| plant | Anthoxanthum aristatum | Annual Vernal-grass | 3 | 2008 |
| plant | Anthoxanthum odoratum | Sweet Vernal Grass | 3686 | 2024 |
| plant | Anthriscus caucalis | Bur Parsley | 88 | 2019 |
| plant | Anthriscus sylvestris | Cow Parsley | 6937 | 2024 |
| plant | Anthyllis vulneraria | Kidney Vetch | 364 | 2024 |
| plant | Antirrhinum majus | Snapdragon | 318 | 2024 |
| plant | Apera | an Apera species (unidentified) | 1 | 1982 |
| plant | Apera spica-venti | Loose Silky-bent | 4 | 2008 |
| plant | Aphanes arvensis | Parsley-piert | 514 | 2023 |
| plant | Aphanes arvensis agg. | Parsley Piert (agg.) | 25 | 2019 |
| plant | Aphanes australis | Slender Parsley-piert | 46 | 2012 |
| plant | Apiaceae | an umbellifer (unidentified) | 17 | 2023 |
| plant | Apium | an Apium species (unidentified) | 7 | 2014 |
| plant | Apium graveolens | Wild Celery | 274 | 2024 |
| plant | Apium graveolens var. dulce | Celery | 1 | 1975 |
| plant | Apium inundatum | Lesser Marshwort | 3 | 2011 |
| plant | Apium nodiflorum | Fool's Water-cress | 2252 | 2023 |
| plant | Apium nodiflorum var. ochreatum | a fool's watercress | 1 | 1920 |
| plant | Apium nodiflorum x repens | a fool's water-cress | 1 | 1930 |
| plant | Aponogeton distachyos | Cape Pondweed | 6 | 2019 |
| plant | Aptenia | an Aptenia species (unidentified) | 2 | 1969 |
| plant | Aptenia cordifolia | Ice-plant | 13 | 2015 |
| plant | Aquilegia | a columbine (unidentified) | 42 | 2023 |
| plant | Aquilegia vulgaris | Columbine | 746 | 2024 |
| plant | Arabidopsis thaliana | Thale Cress | 452 | 2024 |
| plant | Arabis | an Arabis species (unidentified) | 1 | 2002 |
| plant | Arabis caucasica | Garden Arabis | 6 | 2023 |
| plant | Arabis glabra | Tower Mustard | 1 | 2011 |
| plant | Arabis hirsuta | Hairy Rock-cress | 121 | 2013 |
| plant | Arabis scabra | Bristol Rock-cress | 181 | 2013 |
| plant | Aralia elata | Japanese Angelica-tree | 9 | 2002 |
| plant | Araucaria araucana | Monkey-puzzle | 44 | 2023 |
| plant | Arbutus unedo | Strawberry-tree | 50 | 2019 |
| plant | Arctium | a burdock (unidentified) | 171 | 2025 |
| plant | Arctium lappa | Greater Burdock | 887 | 2024 |
| plant | Arctium lappa x minus = A. x nothum | a burdock | 1 | 2004 |
| plant | Arctium minus | Lesser Burdock | 2321 | 2024 |
| plant | Arctium minus/nemorosum | a flowering plant | 7 | 2003 |
| plant | Arctium tomentosum | a burdock | 1 | 1937 |
| plant | Arenaria serpyllifolia | Thyme-leaved Sandwort | 236 | 2024 |
| plant | Arenaria serpyllifolia (sens.lat.) | Thyme-leaved Sandwort sens. lat. | 7 | 2009 |
| plant | Arenaria serpyllifolia subsp. leptoclados | Small Thyme-leaved Sandwort | 139 | 2016 |
| plant | Arenaria serpyllifolia subsp. serpyllifolia | a thyme-leaved sandwort | 340 | 2013 |
| plant | Aristolochia clematitis | Birthwort | 1 | 1996 |
| plant | Armeria | an Armeria species (unidentified) | 2 | 2016 |
| plant | Armeria maritima | Thrift | 115 | 2023 |
| plant | Armeria maritima subsp. maritima | a thrift | 83 | 1999 |
| plant | Armoracia rusticana | Horse-radish | 1149 | 2024 |
| plant | Arrhenatherum elatius | False Oat-grass | 5485 | 2024 |
| plant | Artemisia | an Artemisia species (unidentified) | 1 | 2013 |
| plant | Artemisia abrotanum | Southernwood | 1 | 1988 |
| plant | Artemisia absinthium | Wormwood | 42 | 2019 |
| plant | Artemisia biennis | Slender Mugwort | 26 | 2019 |
| plant | Artemisia dracunculus | Tarragon | 3 | 2013 |
| plant | Artemisia ludoviciana | Silver Wormwood | 3 | 1938 |
| plant | Artemisia vulgaris | Mugwort | 2107 | 2024 |
| plant | Arum | an Arum species (unidentified) | 17 | 2023 |
| plant | Arum italicum | Italian Lords-and-ladies | 39 | 2023 |
| plant | Arum italicum subsp. italicum | an arum | 34 | 2018 |
| plant | Arum italicum subsp. neglectum | an arum | 1 | 1987 |
| plant | Arum maculatum | Lords-and-ladies | 6555 | 2025 |
| plant | Arum maculatum x italicum | Hybrid Cuckoo Pint | 5 | 2017 |
| plant | Asarina procumbens | Trailing Snapdragon | 1 | 2004 |
| plant | Asparagus officinalis | Garden Asparagus | 38 | 2023 |
| plant | Asperula arvensis | Blue Woodruff | 3 | 1988 |
| plant | Asperula cynanchica | Squinancywort | 51 | 2023 |
| plant | Asphodelus fistulosus | Hollow-stemmed Asphodel | 3 | 1935 |
| plant | Aspleniaceae | an Aspleniaceae species (unidentified) | 4 | 2014 |
| plant | Asplenium | an Asplenium species (unidentified) | 2 | 2007 |
| plant | Asplenium adiantum-nigrum | Black Spleenwort | 186 | 2019 |
| plant | Asplenium marinum | Sea Spleenwort | 55 | 2019 |
| plant | Asplenium obovatum | Lanceolate Spleenwort | 7 | 2021 |
| plant | Asplenium obovatum subsp. lanceolatum | a spleenwort | 1 | 1916 |
| plant | Asplenium ruta-muraria | Wall-rue | 1643 | 2024 |
| plant | Asplenium trichomanes | Maidenhair Spleenwort | 763 | 2024 |
| plant | Asplenium trichomanes subsp. quadrivalens | a spleenwort | 720 | 2016 |
| plant | Aster | a michaelmas-daisy (unidentified) | 101 | 2018 |
| plant | Asteraceae | a daisy or composite (unidentified) | 24 | 2023 |
| plant | Aster agg. | a flowering plant | 61 | 2016 |
| plant | Aster amellus | European Michaelmas-daisy | 1 | 2013 |
| plant | Aster laevis x novi-belgii = A. x versicolor | Late Michaelmas-daisy | 1 | 1991 |
| plant | Aster linosyris | Goldilocks Aster | 29 | 2015 |
| plant | Aster novae-angliae | Hairy Michaelmas-daisy | 2 | 2016 |
| plant | Aster novi-belgii | Confused Michaelmas-daisy | 169 | 2018 |
| plant | Aster novi-belgii x lanceolatus = A. x salignus | Common Michaelmas-daisy | 8 | 2023 |
| plant | Aster tripolium | Sea Aster | 450 | 2023 |
| plant | Aster tripolium var. discoideus | a michaelmas-daisy | 5 | 2015 |
| plant | Astragalus danicus | Purple Milk-vetch | 1 | 1989 |
| plant | Astragalus glycyphyllos | Wild Liquorice | 15 | 2016 |
| plant | Athyrium | a lady-fern (unidentified) | 1 | 2009 |
| plant | Athyrium filix-femina | Lady Fern | 370 | 2024 |
| plant | Atriplex | an orache (unidentified) | 20 | 2023 |
| plant | Atriplex barclayana | Barclay's Saltbush | 1 | 1961 |
| plant | Atriplex glabriuscula | Babington's Orache | 49 | 2014 |
| plant | Atriplex halimus | Shrubby Orache | 1 | 1992 |
| plant | Atriplex hortensis | Garden Orache | 1 | 1998 |
| plant | Atriplex laciniata | Frosted Orache | 28 | 2023 |
| plant | Atriplex littoralis | Grass-leaved Orache | 19 | 2022 |
| plant | Atriplex longipes | Long-stalked Orache | 10 | 2010 |
| plant | Atriplex patula | Common Orache | 762 | 2024 |
| plant | Atriplex portulacoides | Sea Purslane | 32 | 2023 |
| plant | Atriplex prostrata | Spear-leaved Orache | 783 | 2024 |
| plant | Atriplex prostrata agg. | a goosefoot | 54 | 2016 |
| plant | Atriplex rosea | Redscale | 1 | 1922 |
| plant | Atriplex tatarica | a flowering plant | 1 | 1915 |
| plant | Atropa | an Atropa species (unidentified) | 1 | 2003 |
| plant | Atropa belladonna | Deadly Nightshade | 25 | 2013 |
| plant | Aubrieta deltoidea | Aubretia | 57 | 2023 |
| plant | Aucuba | an Aucuba species (unidentified) | 1 | 2009 |
| plant | Aucuba japonica | Spotted-laurel | 112 | 2023 |
| plant | Austrocedrus chilensis | a conifer | 1 | 2004 |
| plant | Avena | an Avena species (unidentified) | 2 | 2002 |
| plant | Avena fatua | Wild Oat | 528 | 2023 |
| plant | Avena sativa | Oat | 67 | 2017 |
| plant | Avena sterilis | Winter Wild-oat | 3 | 2016 |
| plant | Avena sterilis subsp. ludoviciana | a winter wild oat | 3 | 1985 |
| plant | Avena strigosa | Bristle Oat | 3 | 1985 |
| plant | Axyris amaranthoides | Russian Pigweed | 2 | 1953 |
| plant | Azara microphylla | Box-leaf Azara | 2 | 2015 |
| plant | Azolla filiculoides | Water Fern | 139 | 2022 |
| reptile | Anguis fragilis | Slow-worm | 2372 | 2025 |
| sea-fan, sea anemone or jellyfish | Abietinaria abietina | a Sea-fan/Sea Anemone/Jellyfish | 1 | 1936 |
| sea-fan, sea anemone or jellyfish | Actinia equina | Beadlet Anemone | 15 | 2025 |
| sea-fan, sea anemone or jellyfish | Amphisbetia operculata | a Sea-fan/Sea Anemone/Jellyfish | 1 | 1936 |
| sea-fan, sea anemone or jellyfish | Aurelia aurita | Moon jellyfish | 5 | 2018 |
| slime mould | Arcyria affinis | a slime mould | 1 | 2018 |
| slime mould | Arcyria cinerea | a slime mould | 2 | 2023 |
| slime mould | Arcyria denudata | a slime mould | 13 | 2023 |
| slime mould | Arcyria ferruginea | a slime mould | 1 | 2010 |
| slime mould | Arcyria incarnata | a slime mould | 1 | 2012 |
| slime mould | Arcyria nutans | a slime mould | 2 | 2012 |
| slime mould | Arcyria pomiformis | a slime mould | 5 | 2014 |
| slime mould | Arcyria stipata | a slime mould | 2 | 2018 |
| spider | Agalenatea redii | an orb-weaver spider | 34 | 2023 |
| spider | Agelena | an Agelena species (unidentified) | 1 | 2018 |
| spider | Agelena labyrinthica | Labyrinth Spider | 26 | 2023 |
| spider | Agelenidae | an Agelenidae species (unidentified) | 3 | 2012 |
| spider | Agroeca inopina | a running foliage spider | 1 | 1997 |
| spider | Agroeca proxima | a running foliage spider | 1 | 1998 |
| spider | Agyneta conigera | a money spider | 2 | 1965 |
| spider | Alopecosa pulverulenta | a wolf spider | 25 | 2024 |
| spider | Amaurobius | a lace-webbed spider (unidentified) | 7 | 2023 |
| spider | Amaurobius fenestralis | a lace-webbed spider | 12 | 2015 |
| spider | Amaurobius ferox | Black Lace-weaver Spider | 30 | 2023 |
| spider | Amaurobius similis | Lace-weaver Spider | 22 | 2023 |
| spider | Anelosimus vittatus | a comb-footed spider | 21 | 2018 |
| spider | Antistea elegans | a lesser cobweb spider | 2 | 1999 |
| spider | Anyphaena accentuata | Buzzing Spider | 32 | 2023 |
| spider | Arachnida | an Arachnida species (unidentified) | 3 | 2020 |
| spider | Araneae | an Araneae species (unidentified) | 44 | 2023 |
| spider | Araneidae | a spider (unidentified) | 128 | 2023 |
| spider | Araneus | an Araneus orb-weaver spider (unidentified) | 7 | 2023 |
| spider | Araneus diadematus | Garden Orb-web Spider | 904 | 2025 |
| spider | Araneus marmoreus | an orb-weaver spider | 5 | 2015 |
| spider | Araneus quadratus | an orb-weaver spider | 38 | 2023 |
| spider | Araneus sturmi | an orb-weaver spider | 2 | 2019 |
| spider | Araneus triguttatus | an orb-weaver spider | 3 | 2010 |
| spider | Araniella | an Araniella species (unidentified) | 15 | 2023 |
| spider | Araniella cucurbitina (sensu lato) | Cucumber Spider | 65 | 2025 |
| spider | Araniella cucurbitina (sensu stricto) | an orb-weaver spider | 8 | 2017 |
| spider | Araniella displicata | an orb-weaver spider | 2 | 2008 |
| spider | Araniella inconspicua | an orb-weaver spider | 2 | 1999 |
| spider | Araniella opisthographa | an orb-weaver spider | 19 | 2012 |
| spider | Arctosa leopardus | a wolf spider | 2 | 1990 |
| spider | Argenna subnigra | a mesh webbed spider | 1 | 1997 |
| spider | Argiope bruennichi | Wasp Spider | 8 | 2023 |
| spider | Argyroneta aquatica | Water Spider | 30 | 2021 |
| spider | Asagena phalerata | a comb-footed spider | 3 | 1999 |
| spider | Atypus affinis | Purse Web Spider | 16 | 2023 |
| springtail | Allacma fusca | a springtail (Collembola) | 1 | 2015 |
| springtail | Anurida maritima | a springtail (Collembola) | 6 | 2017 |
| thrip | Aeolothrips | an Aeolothrips species (unidentified) | 1 | 2010 |
| thrip | Aeolothrips albicinctus | a thrip | 1 | 2008 |
| thrip | Aeolothrips ericae | a thrip | 2 | 2003 |
| tick or mite (acarine) | Acalitus brevitarsus | a gall mite | 3 | 2011 |
| tick or mite (acarine) | Acalitus stenaspis | a gall mite | 2 | 1997 |
| tick or mite (acarine) | Acari | a mite (Acarine) (unidentified) | 18 | 2023 |
| tick or mite (acarine) | Aceria | a gall mite | 3 | 2019 |
| tick or mite (acarine) | Aceria aceriscampestris | a gall mite | 7 | 2023 |
| tick or mite (acarine) | Aceria campestricola | a gall mite | 13 | 2023 |
| tick or mite (acarine) | Aceria cephalonea | Sycamore Cherry Mite | 23 | 2023 |
| tick or mite (acarine) | Aceria erinea | a gall mite | 14 | 2022 |
| tick or mite (acarine) | Aceria filiformis | a gall mite | 1 | 2019 |
| tick or mite (acarine) | Aceria fraxini | a gall mite | 2 | 1997 |
| tick or mite (acarine) | Aceria fraxinivora | Ash Key Gall Mite | 8 | 2021 |
| tick or mite (acarine) | Aceria ilicis | a gall mite | 7 | 2023 |
| tick or mite (acarine) | Aceria iteina | a gall mite | 1 | 1997 |
| tick or mite (acarine) | Aceria labiatiflorae | a gall mite | 1 | 2021 |
| tick or mite (acarine) | Aceria macrochela | a gall mite | 19 | 2020 |
| tick or mite (acarine) | Aceria macrocheluserinea | a gall mite | 4 | 2018 |
| tick or mite (acarine) | Aceria macrorhyncha | a gall mite | 4 | 2014 |
| tick or mite (acarine) | Aceria myriadeum | a gall mite | 2 | 2017 |
| tick or mite (acarine) | Aceria nalepai | a gall mite | 1 | 2011 |
| tick or mite (acarine) | Aceria nervisequa | a gall mite | 2 | 2019 |
| tick or mite (acarine) | Aceria pseudoplatani | a gall mite | 9 | 2020 |
| tick or mite (acarine) | Aceria sanguisorbae | a gall mite | 2 | 2013 |
| tick or mite (acarine) | Aculops fuchsiae | Fuchsia Gall Mite | 7 | 2023 |
| tick or mite (acarine) | Aculus fraxini | a gall mite | 1 | 2012 |
| tick or mite (acarine) | Aculus tetanothrix | a gall mite | 1 | 2013 |
| tick or mite (acarine) | Allothrombium | an Allothrombium mite (unidentified) | 7 | 2023 |
| tick or mite (acarine) | Anystis | a whirligig mite (unidentified) | 2 | 2023 |
| tick or mite (acarine) | Anystis baccarum | Whirligig Mite | 1 | 1938 |
| tick or mite (acarine) | Arrenurus | an Arrenurus species (unidentified) | 3 | 1991 |
| tick or mite (acarine) | Atractides (Tympanomegapus) acutirostris | a water mite | 1 | 2016 |
| true fly - | Acalyptratae | an Acalyptratae species (unidentified) | 2 | 2023 |
| true fly - | Acletoxenus formosus | a fruit fly | 3 | 2018 |
| true fly - | Actia lamia | a parasitic fly | 1 | 2008 |
| true fly - | Actia pilipennis | a parasitic fly | 3 | 2006 |
| true fly - | Adia cinerella | a fly | 2 | 2013 |
| true fly - | Aedes | an Aedes species (unidentified) | 1 | 2012 |
| true fly - | Agathomyia cinerea (misident.) | a big-footed fly | 1 | 2000 |
| true fly - | Agathomyia unicolor | a big-footed fly | 1 | 2003 |
| true fly - | Agromyza | an Agromyza species (unidentified) | 1 | 2008 |
| true fly - | Agromyza abiens | a leaf-mining fly | 4 | 2019 |
| true fly - | Agromyza albipennis | a leaf-mining fly | 2 | 2020 |
| true fly - | Agromyza albitarsis | a leaf-mining fly | 1 | 2020 |
| true fly - | Agromyza alnivora | a leaf-mining fly | 3 | 2013 |
| true fly - | Agromyza anthracina | a leaf-mining fly | 4 | 2020 |
| true fly - | Agromyza bromi | a leaf-mining fly | 1 | 2003 |
| true fly - | Agromyza conjuncta | a leaf-mining fly | 1 | 2001 |
| true fly - | Agromyza demeijerei | a leaf-mining fly | 3 | 2020 |
| true fly - | Agromyza dipsaci | a leaf-mining fly | 4 | 2020 |
| true fly - | Agromyza flaviceps | a leaf-mining fly | 1 | 2020 |
| true fly - | Agromyza frontella | a leaf-mining fly | 1 | 2021 |
| true fly - | Agromyza idaeiana | a leaf-mining fly | 4 | 2020 |
| true fly - | Agromyza johannae | a leaf-mining fly | 2 | 2021 |
| true fly - | Agromyza lithospermi | a leaf-mining fly | 3 | 2021 |
| true fly - | Agromyza myosotidis | a leaf-mining fly | 1 | 2020 |
| true fly - | Agromyza nana | a leaf-mining fly | 3 | 2020 |
| true fly - | Agromyza nigrella | a leaf-mining fly | 1 | 2001 |
| true fly - | Agromyza nigrescens | a leaf-mining fly | 2 | 2015 |
| true fly - | Agromyza nigripes | a leaf-mining fly | 2 | 2001 |
| true fly - | Agromyza nigrociliata | a leaf-mining fly | 1 | 1979 |
| true fly - | Agromyza pseudoreptans | a leaf-mining fly | 7 | 2020 |
| true fly - | Agromyza reptans | a leaf-mining fly | 1 | 2008 |
| true fly - | Agromyza sulfuriceps | a leaf-mining fly | 1 | 2015 |
| true fly - | Agromyza varicornis | a leaf-mining fly | 2 | 2020 |
| true fly - | Agromyzidae | an Agromyzidae species (unidentified) | 1 | 2023 |
| true fly - | Amauromyza | an Amauromyza species (unidentified) | 1 | 2017 |
| true fly - | Amauromyza flavifrons | a leaf-mining fly | 3 | 2022 |
| true fly - | Amauromyza labiatarum | a leaf-mining fly | 3 | 2023 |
| true fly - | Amauromyza monfalconensis | a leaf-mining fly | 1 | 2002 |
| true fly - | Amauromyza morionella | a leaf-mining fly | 3 | 2023 |
| true fly - | Amauromyza verbasci | a leaf-mining fly | 5 | 2024 |
| true fly - | Amobia signata | a flesh fly | 1 | 2001 |
| true fly - | Anagnota bicolor | a fly | 1 | 2009 |
| true fly - | Anevrina thoracica | a scuttle fly | 2 | 2021 |
| true fly - | Anophelinae | an Anophelinae species (unidentified) | 3 | 1997 |
| true fly - | Anthomyia | an Anthomyia species (unidentified) | 2 | 2019 |
| true fly - | Anthomyia liturata | a fly | 17 | 2013 |
| true fly - | Anthomyia pluvialis | a fly | 4 | 2021 |
| true fly - | Anthomyia procellaris | a fly | 16 | 2023 |
| true fly - | Anthomyiidae | a Anthomyiidae muscid fly (unidentified) | 1 | 2021 |
| true fly - | Anthomyza anderssoni | a fly | 2 | 2008 |
| true fly - | Anthomyza collini | a fly | 5 | 2001 |
| true fly - | Anthomyza elbergi | a fly | 2 | 2004 |
| true fly - | Anthomyza gracilis | a fly | 28 | 2013 |
| true fly - | Anthomyza neglecta | a fly | 4 | 2009 |
| true fly - | Apiloscatopse picea | a fly | 3 | 2021 |
| true fly - | Arganthomyza socculata | a fly | 1 | 2000 |
| true fly - | Asilidae | an Asilidae species (unidentified) | 1 | 2019 |
| true fly - | Asteia amoena | a fly | 2 | 2004 |
| true fly - | Asteia concinna | a fly | 3 | 2001 |
| true fly - | Astiosoma rufifrons | a fly | 1 | 1985 |
| true fly - | Atelestus pulicarius | a big-footed fly | 2 | 2006 |
| true fly - | Athrycia trepida | a parasitic fly | 3 | 2019 |
| true fly - | Aulacigaster leucopeza | a fly | 1 | 1952 |
| true fly - | Aulagromyza | an Aulagromyza species (unidentified) | 1 | 2011 |
| true fly - | Austrosciara hyalipennis | a fly | 2 | 2020 |
| true fly - | Azelia cilipes | a muscid fly | 6 | 2003 |
| true fly - | Azelia nebulosa | a muscid fly | 8 | 2008 |
| true fly - | Azelia triquetra | a muscid fly | 1 | 2000 |
| true fly - cranefly | Achyrolimonia decemmaculata | a cranefly | 6 | 2021 |
| true fly - cranefly | Antocha vitripennis | a cranefly | 1 | 2006 |
| true fly - cranefly | Austrolimnophila ochracea | a cranefly | 24 | 2023 |
| true fly - (diptera) | Achalcus bimaculatus | an insect - true fly (Diptera) | 1 | 2008 |
| true fly - (diptera) | Acrosathe annulata | an insect - true fly (Diptera) | 1 | 2013 |
| true fly - (diptera) | Atypophthalmus inustus | an insect - true fly (Diptera) | 1 | 2001 |
| true fly - (diptera) | Aulagromyza cornigera | an insect - true fly (Diptera) | 1 | 2020 |
| true fly - (diptera) | Aulagromyza hendeliana | an insect - true fly (Diptera) | 1 | 2013 |
| true fly - (diptera) | Aulagromyza heringii | an insect - true fly (Diptera) | 1 | 2015 |
| true fly - (diptera) | Aulagromyza populi | an insect - true fly (Diptera) | 2 | 2020 |
| true fly - (diptera) | Aulagromyza populicola | an insect - true fly (Diptera) | 2 | 2020 |
| true fly - (diptera) | Aulagromyza similis | an insect - true fly (Diptera) | 1 | 2000 |
| true fly - (diptera) | Aulagromyza tremulae | an insect - true fly (Diptera) | 1 | 2013 |
| true fly - (diptera) | Aulagromyza tridentata | an insect - true fly (Diptera) | 3 | 2022 |
| true fly - (diptera) | Aulagromyza trivittata | an insect - true fly (Diptera) | 1 | 2006 |
| true fly - horse fly | Atylotus fulvus | a horse fly | 1 | 2018 |
| true fly - horse fly | Atylotus rusticus | a horse fly | 3 | 2023 |
| true fly - hoverfly | Anasimyia contracta | a hoverfly | 9 | 2023 |
| true fly - hoverfly | Anasimyia lineata | a hoverfly | 3 | 2019 |
| true fly - midge, gnat or mosquito | Acnemia nitidicollis | a fungus gnat | 6 | 2020 |
| true fly - midge, gnat or mosquito | Acricotopus lucens | a non-biting midge | 1 | 1983 |
| true fly - midge, gnat or mosquito | Allodia alternans | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Allodia grata | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Allodia ornaticollis | a fungus gnat | 4 | 2020 |
| true fly - midge, gnat or mosquito | Allodiopsis rustica | a fungus gnat | 5 | 2020 |
| true fly - midge, gnat or mosquito | Anatella ciliata | a fungus gnat | 1 | 2003 |
| true fly - midge, gnat or mosquito | Anatella lenis | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Anatella minuta | a fungus gnat | 1 | 2003 |
| true fly - midge, gnat or mosquito | Anatella turi | a fungus gnat | 1 | 2000 |
| true fly - midge, gnat or mosquito | Anopheles | a Anopheles mosquito (unidentified) | 28 | 2013 |
| true fly - midge, gnat or mosquito | Anopheles atroparvus | a mosquito | 3 | 2004 |
| true fly - midge, gnat or mosquito | Anopheles claviger | a mosquito | 13 | 2012 |
| true fly - midge, gnat or mosquito | Anopheles messeae | a mosquito | 1 | 1983 |
| true fly - midge, gnat or mosquito | Antlemon servulum | a fungus gnat | 2 | 2020 |
| true fly - midge, gnat or mosquito | Apolephthisa subincana | a fungus gnat | 6 | 2021 |
| true fly - picture-winged, conopid or stilt-legged fly | Acanthiophilus helianthi | a gall fly | 3 | 2003 |
| true fly - picture-winged, conopid or stilt-legged fly | Acidia cognata | a gall fly | 1 | 1991 |
| true fly - picture-winged, conopid or stilt-legged fly | Acinia corniculata | a gall fly | 1 | 1950 |
| true fly - picture-winged, conopid or stilt-legged fly | Anomoia purmunda | a gall fly | 37 | 2021 |
| true fly - robber, empid or dolichopid fly | Achalcus flavicollis | a dolichopodid fly | 3 | 2009 |
| true fly - robber, empid or dolichopid fly | Anepsiomyia flaviventris | a dolichopodid fly | 2 | 2001 |
| true fly - robber, empid or dolichopid fly | Argyra argentina | a dolichopodid fly | 4 | 2001 |
| true fly - robber, empid or dolichopid fly | Argyra argyria | a dolichopodid fly | 3 | 2009 |
| true fly - robber, empid or dolichopid fly | Argyra atriceps | a dolichopodid fly | 1 | 1948 |
| true fly - robber, empid or dolichopid fly | Argyra ilonae | a dolichopodid fly | 1 | 2001 |
| true fly - robber, empid or dolichopid fly | Argyra leucocephala | a dolichopodid fly | 8 | 2023 |
| true fly - robber, empid or dolichopid fly | Argyra perplexa | a dolichopodid fly | 1 | 1983 |
| true fly - robber, empid or dolichopid fly | Argyra vestita | a dolichopodid fly | 6 | 2022 |
| true fly - robber, empid or dolichopid fly | Asilus crabroniformis | Hornet Robberfly | 9 | 2019 |
| true fly - robber, empid or dolichopid fly | Australachalcus melanotrichus | a dolichopodid fly | 1 | 1968 |
| true fly - soldier or snipe fly | Atherix ibis | a snipe fly | 2 | 1978 |
| true fly - soldier or snipe fly | Atrichops crassipes | a snipe fly | 2 | 1995 |
| water flea | Acroperus harpae | a water flea | 1 | 2020 |
| woodlouse | Androniscus dentiger | Rosy Woodlouse | 16 | 2023 |
| woodlouse | Armadillidium depressum | Southern Pill Woodlouse | 52 | 2023 |
| woodlouse | Armadillidium nasatum | a pill woodlouse | 44 | 2023 |
| woodlouse | Armadillidium pulchellum | a pill woodlouse | 1 | 1948 |
| woodlouse | Armadillidium vulgare | Common Pill Woodlouse | 120 | 2025 |
| woodlouse | Asellidae | a water slater (unidentified) (or a hoglouse (unidentified) | 82 | 2023 |
| woodlouse | Asellus | an Asellus water slater (unidentified) | 64 | 2018 |
| woodlouse | Asellus (Asellus) aquaticus | Common Water Slater | 501 | 2023 |
| worm | Alitta virens | an annelid | 6 | 1976 |
| worm | Allolobophora chlorotica | Green Worm | 95 | 2020 |
| worm | Annelida | an Annelida species (unidentified) | 12 | 2014 |
| worm | Aphelochaeta marioni | an annelid | 1 | 1976 |
| worm | Aporrectodea caliginosa (s.l. (pre Sherlock, 2018)) | Grey Worm | 104 | 2020 |
| worm | Aporrectodea longa | Black-headed Worm | 61 | 2020 |
| worm | Aporrectodea nocturna | an earthworm | 2 | 2017 |
| worm | Aporrectodea rosea | Rosy-tip Worm | 79 | 2019 |
| worm | Arenicola marina | Blow Lugworm | 10 | 2019 |