Species Recorded | Taxon | Scientific Name | Common Name | Records | Latest |
| alder fly, lacewing or snake fly | Dichochrysa flavifrons | a green lacewing | 2 | 2008 |
| alder fly, lacewing or snake fly | Dichochrysa ventralis | a green lacewing | 2 | 1993 |
| algae or stonewort | Derbesia | a Derbesia species (unidentified) | 1 | 2013 |
| algae or stonewort | Derbesia tenuissima | an alga | 1 | 2025 |
| algae or stonewort | Desmidiaceae | a Desmidiaceae species (unidentified) | 2 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dacnusa areolaris | an insect - hymenopteran | 3 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dapsilarthra apii | a braconid wasp | 2 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dendrocerus aphidum | an insect - hymenopteran | 2 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diadegma majale | an insect - hymenopteran | 1 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diadegma semiclausum | an insect - hymenopteran | 2 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diadegma tenuipes | an insect - hymenopteran | 2 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diastrophus rubi | a gall wasp | 15 | 2015 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dicaelotus pumilus | an ichneumon wasp | 4 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dicladocerus westwoodii | a parasitic wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Didineis lunicornis | a solitary wasp | 1 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dinocampus coccinellae | a braconid wasp | 1 | 2010 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diphyus quadripunctorius | an ichneumon wasp | 1 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diplazon laetatorius | an ichneumon wasp | 6 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diplazon pectoratorius | an ichneumon wasp | 1 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diplazon tetragonus | an ichneumon wasp | 1 | 1994 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diplolepis eglanteriae | a gall wasp | 3 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diplolepis nervosa | a gall wasp | 4 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diplolepis rosae | Robin's Pin-cushion Gall | 86 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dipogon variegatus | a spider-hunting wasp | 2 | 2010 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Diprion pini | a sawfly | 2 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dirophanes fulvitarsis | an ichneumon wasp | 1 | 1994 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus | a Dolerus species (unidentified) | 4 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus aeneus | a sawfly | 1 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus aericeps | a sawfly | 1 | 2001 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus brevicornis | a sawfly | 1 | 1983 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus cothurnatus | a sawfly | 3 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus ferrugatus | an insect - hymenopteran | 1 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus fumosus | a sawfly | 1 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus gessneri | a sawfly | 2 | 1971 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus gonager | an insect - hymenopteran | 1 | 2004 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus nigratus | an insect - hymenopteran | 1 | 2004 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolerus picipes | a sawfly | 3 | 2004 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolichomitus | a Dolichomitus species (unidentified) | 2 | 2011 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolichomitus agnoscendus | an ichneumon wasp | 2 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolichovespula media | Median Wasp | 26 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolichovespula norwegica | Norwegian Wasp | 5 | 2004 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolichovespula saxonica | Saxon Wasp | 1 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dolichovespula sylvestris | Tree Wasp | 42 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dusona | a Dusona species (unidentified) | 1 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dusona falcator | an insect - hymenopteran | 1 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dusona mercator | an insect - hymenopteran | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dusona prominula | an insect - hymenopteran | 1 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dyscritulus planiceps | an aphid parasitic wasp | 1 | 2015 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Dyspetes arrogator | an ichneumon wasp | 3 | 2002 |
| beetle | Dacne bipustulata | a shiny fungus beetle | 3 | 2023 |
| beetle | Dacne rufifrons | a shiny fungus beetle | 9 | 2023 |
| beetle | Dalopius marginatus | a click beetle | 19 | 2024 |
| beetle | Dascillus cervinus | Orchid beetle | 1 | 2015 |
| beetle | Dasytes aeratus | a malachite beetle | 14 | 2022 |
| beetle | Datonychus melanostictus | a weevil | 6 | 2010 |
| beetle | Datonychus urticae | a weevil | 1 | 2008 |
| beetle | Deleaster dichrous | a rove beetle | 3 | 2022 |
| beetle | Demetrias atricapillus | a ground beetle | 74 | 2023 |
| beetle | Dendrophilus punctatus | a carrion beetle | 1 | 2016 |
| beetle | Denticollis linearis | a click beetle | 57 | 2023 |
| beetle | Deporaus betulae | Birch Leaf Roller | 2 | 2021 |
| beetle | Dermestes haemorrhoidalis | a museum or larder beetle | 3 | 2019 |
| beetle | Dermestes lardarius | Bacon Beetle | 2 | 1997 |
| beetle | Dermestes murinus | a museum or larder beetle | 1 | 1976 |
| beetle | Dermestes peruvianus | a museum or larder beetle | 2 | 2003 |
| beetle | Derocrepis rufipes | a leaf beetle | 3 | 2004 |
| beetle | Dicheirotrichus gustavii | a ground beetle | 7 | 2019 |
| beetle | Dienerella ruficollis | a mould beetle | 1 | 1978 |
| beetle | Dimetrota atramentaria | a rove beetle | 1 | 2003 |
| beetle | Dinaraea aequata | a rove beetle | 1 | 2001 |
| beetle | Dinaraea angustula | a rove beetle | 1 | 1953 |
| beetle | Diplapion stolidum | a seed weevil | 4 | 1968 |
| beetle | Diplocoelus fagi | a biphyllid beetle | 2 | 2017 |
| beetle | Donacia | a Donacia species (unidentified) | 2 | 1997 |
| beetle | Donacia bicolora | a Beetle | 1 | 2010 |
| beetle | Donacia clavipes | a leaf beetle | 7 | 2023 |
| beetle | Donacia marginata | a leaf beetle | 14 | 2024 |
| beetle | Donacia semicuprea | a leaf beetle | 1 | 1983 |
| beetle | Donacia simplex | a leaf beetle | 17 | 2021 |
| beetle | Donacia thalassina | a leaf beetle | 2 | 2011 |
| beetle | Donacia versicolorea | a leaf beetle | 2 | 2002 |
| beetle | Donacia vulgaris | a leaf beetle | 6 | 2023 |
| beetle | Dorcatoma chrysomelina | a wood boring beetle | 8 | 2021 |
| beetle | Dorcatoma flavicornis | a wood boring beetle | 1 | 2016 |
| beetle | Dorcatoma substriata | a wood boring beetle | 2 | 2018 |
| beetle | Dorcus parallelipipedus | Lesser Stag Beetle | 139 | 2024 |
| beetle | Dorytomus | a Dorytomus species (unidentified) | 1 | 2009 |
| beetle | Dorytomus dejeani | a weevil | 1 | 1983 |
| beetle | Dorytomus filirostris | a weevil | 3 | 2004 |
| beetle | Dorytomus ictor | a weevil | 3 | 2020 |
| beetle | Dorytomus rufatus | a weevil | 4 | 2018 |
| beetle | Dorytomus taeniatus | a weevil | 6 | 2018 |
| beetle | Dorytomus tortrix | a weevil | 2 | 2000 |
| beetle | Dromius agilis | a ground beetle | 1 | 1978 |
| beetle | Dromius meridionalis | a ground beetle | 16 | 2021 |
| beetle | Dromius quadrimaculatus | a ground beetle | 16 | 2022 |
| beetle | Dropephylla devillei | a rove beetle | 2 | 2016 |
| beetle | Dropephylla ioptera | an insect - beetle (Coleoptera) | 4 | 2021 |
| beetle | Dropephylla vilis | a rove beetle | 2 | 2001 |
| beetle | Drupenatus nasturtii | a weevil | 2 | 1976 |
| beetle | Drusilla canaliculata | a rove beetle | 32 | 2023 |
| beetle | Dryocoetes villosus | a bark or ambrosia beetle | 24 | 2023 |
| beetle | Dryophthorus corticalis | a weevil | 1 | 2015 |
| beetle | Dryopidae | a Dryopidae species (unidentified) | 3 | 1993 |
| beetle | Dryops | a Dryops species (unidentified) | 6 | 2012 |
| beetle | Dryops auriculatus | a long-toed water beetle | 1 | 1997 |
| beetle | Dryops ernesti | a long-toed water beetle | 4 | 2020 |
| beetle | Dryops luridus | a long-toed water beetle | 24 | 2013 |
| beetle | Dyschirius globosus | a ground beetle | 4 | 2019 |
| beetle | Dyschirius salinus | a ground beetle | 2 | 2019 |
| beetle | Dytiscidae | a Dytiscidae water beetle or diving beetle (unidentified) | 112 | 2020 |
| beetle | Dytiscus | a Dytiscus species (unidentified) | 74 | 2013 |
| beetle | Dytiscus circumflexus | a water beetle | 1 | 2013 |
| beetle | Dytiscus dimidiatus | a water beetle | 3 | 2022 |
| beetle | Dytiscus marginalis | Great Diving Beetle | 109 | 2025 |
| beetle | Dytiscus semisulcatus | a water beetle | 3 | 2025 |
| bird | Delichon sp. or Riparia sp. | a martin (bird) (unidentified) | 9 | 2018 |
| bird | Delichon urbicum | House Martin | 12726 | 2025 |
| bird | Dendrocopos | a Dendrocopos woodpecker (unidentified) | 13 | 2019 |
| bird | Dendrocopos major | Great Spotted Woodpecker | 22627 | 2025 |
| bird | Dendrocygna | a dendrocygna Whistling Duck (unidentified) | 1 | 2016 |
| bird | Dendrocygna bicolor | Fulvous Whistling Duck | 27 | 2015 |
| bird | Dryobates minor | Lesser Spotted Woodpecker | 1211 | 2021 |
| bristletail (silverfish and allies) | Dilta | a Dilta species (unidentified) | 3 | 2023 |
| bristletail (silverfish and allies) | Dilta hibernica | Southern Bristletail | 5 | 2017 |
| bug | Delphax pulchellus | a planthopper | 4 | 2019 |
| bug | Deraeocoris | a Deraeocoris species (unidentified) | 2 | 2018 |
| bug | Deraeocoris (Deraeocoris) flavilinea | a plantbug or grassbug | 57 | 2025 |
| bug | Deraeocoris (Deraeocoris) olivaceus | a plantbug or grassbug | 5 | 2023 |
| bug | Deraeocoris (Deraeocoris) ruber | a plantbug or grassbug | 110 | 2025 |
| bug | Deraeocoris (Knightocapsus) lutescens | a plantbug or grassbug | 50 | 2025 |
| bug | Derephysia (Derephysia) foliacea | a lace bug | 2 | 2020 |
| bug | Dichrooscytus rufipennis | a plantbug or grassbug | 1 | 1993 |
| bug | Dicranocephalus medius | a spurgebug | 2 | 2009 |
| bug | Dicranotropis hamata | a planthopper | 2 | 2018 |
| bug | Dictyla convergens | a lace bug | 1 | 2020 |
| bug | Dictyonota strichnocera | a lace bug | 1 | 2021 |
| bug | Dicyphus | a Dicyphus species (unidentified) | 1 | 2024 |
| bug | Dicyphus (Brachyceroea) annulatus | a plantbug or grassbug | 5 | 2019 |
| bug | Dicyphus (Brachyceroea) globulifer | a plantbug or grassbug | 2 | 1983 |
| bug | Dicyphus (Dicyphus) constrictus | a plantbug or grassbug | 1 | 1984 |
| bug | Dicyphus (Dicyphus) epilobii | a plantbug or grassbug | 27 | 2025 |
| bug | Dicyphus (Dicyphus) errans | a plantbug or grassbug | 17 | 2025 |
| bug | Dicyphus (Dicyphus) stachydis | a plantbug or grassbug | 13 | 2022 |
| bug | Dicyphus (Dicyphus) tamaninii | a plantbug or grassbug | 1 | 2023 |
| bug | Ditropis pteridis | a planthopper | 1 | 2022 |
| bug | Dolycoris baccarum | Hairy Shieldbug | 401 | 2025 |
| bug | Drepanosiphum platanoidis | Sycamore Aphid | 65 | 2023 |
| bug | Drymus (Sylvadrymus) brunneus | a ground bug | 11 | 2022 |
| bug | Drymus (Sylvadrymus) ryei | a ground bug | 8 | 2019 |
| bug | Drymus (Sylvadrymus) sylvaticus | a ground bug | 79 | 2023 |
| bug | Dryophilocoris (Dryophilocoris) flavoquadrimaculatus | a plantbug or grassbug | 34 | 2022 |
| bug | Dysaphis (Dysaphis) crataegi | Hawthorn-carrot Aphid | 1 | 2021 |
| bug | Dysaphis (Dysaphis) ranunculi | an aphid | 1 | 2020 |
| bug | Dysaphis (Pomaphis) plantaginea | Rosy Apple Aphid | 10 | 1975 |
| caddis fly | Drusus annulatus | a caddisfly | 5 | 2019 |
| crustacean | Daphniidae | a Daphniidae species (unidentified) | 4 | 2020 |
| crustacean | Decapoda | a crustacean | 1 | 2020 |
| crustacean | Deshayesorchestia deshayesii | a crustacean | 1 | 1939 |
| crustacean | Dexamine spinosa | a crustacean | 1 | 1906 |
| crustacean | Diacyclops bicuspidatus | a crustacean | 1 | 1963 |
| crustacean | Diastylis rathkei | a crustacean | 1 | 1976 |
| diatom | Diatoma | a Diatoma species (unidentified) | 1 | 2010 |
| earwig | Dermaptera | an earwig (unidentified) | 51 | 2018 |
| fish | Dasyatis pastinaca | Common Stingray | 1 | 1997 |
| fish | Dicentrarchus labrax | Sea Bass | 7 | 2023 |
| fish | Dipturus batis | Common Skate | 1 | 1879 |
| flea | Dasypsyllus (Dasypsyllus) gallinulae subsp. gallinulae | Moorhen flea | 3 | 2005 |
| fungus | Dacrymyces capitatus | a basidiomycete fungus | 2 | 2010 |
| fungus | Dacrymyces deliquescens | a basidiomycete fungus | 21 | 2010 |
| fungus | Dacrymyces lacrymalis | a basidiomycete fungus | 1 | 2020 |
| fungus | Dacrymyces stillatus | a basidiomycete fungus | 57 | 2023 |
| fungus | Daedalea quercina | a basidiomycete fungus | 28 | 2014 |
| fungus | Daedaleopsis | a Daedaleopsis species (unidentified) | 1 | 2025 |
| fungus | Daedaleopsis confragosa | Blushing Bracket | 168 | 2025 |
| fungus | Daldinia | a Daldinia species (unidentified) | 4 | 2023 |
| fungus | Daldinia concentrica | King Alfred's Cakes | 854 | 2025 |
| fungus | Dasyscyphus virgineus var. selecta | an ascomycete fungus | 2 | 1998 |
| fungus | Datronia mollis | a basidiomycete fungus | 31 | 2014 |
| fungus | Delicatula integrella | a basidiomycete fungus | 1 | 2014 |
| fungus | Dendrothele acerina | a basidiomycete fungus | 5 | 2013 |
| fungus | Dendryphion comosum | a fungus | 2 | 2010 |
| fungus | Dermea cerasi | an ascomycete fungus | 1 | 1996 |
| fungus | Dermoloma cuneifolium | a basidiomycete fungus | 54 | 2021 |
| fungus | Dermoloma josserandii | a basidiomycete fungus | 1 | 2011 |
| fungus | Dermoloma josserandii var. josserandii | a fungus | 1 | 1997 |
| fungus | Dermoloma josserandii var. phaeopodium | a fungus | 1 | 2002 |
| fungus | Dermoloma pseudocuneifolium | a basidiomycete fungus | 5 | 2013 |
| fungus | Dialonectria episphaeria | an ascomycete fungus | 8 | 2010 |
| fungus | Diaporthe eres | an ascomycete fungus | 3 | 2001 |
| fungus | Diaporthe impulsa | an ascomycete fungus | 1 | 2010 |
| fungus | Diaporthe nobilis | an ascomycete fungus | 13 | 1998 |
| fungus | Diaporthe pulla | an ascomycete fungus | 1 | 1996 |
| fungus | Diaporthe pustulata | an ascomycete fungus | 1 | 2010 |
| fungus | Diaporthe samaricola | a fungus | 12 | 2015 |
| fungus | Diaporthe strumella | an ascomycete fungus | 1 | 2005 |
| fungus | Diatrype bullata | an ascomycete fungus | 3 | 1999 |
| fungus | Diatrype disciformis | an ascomycete fungus | 40 | 2013 |
| fungus | Diatrypella favacea | an ascomycete fungus | 25 | 2012 |
| fungus | Diatrypella quercina | an ascomycete fungus | 45 | 2013 |
| fungus | Diatrype stigma | an ascomycete fungus | 139 | 2025 |
| fungus | Dichomitus campestris | a basidiomycete fungus | 1 | 1997 |
| fungus | Diplocarpa bloxamii | an ascomycete fungus | 1 | 2012 |
| fungus | Diplocarpon earlianum | an ascomycete fungus | 1 | 2015 |
| fungus | Diplocarpon mespili | an ascomycete fungus | 3 | 2020 |
| fungus | Diplocarpon rosae | Rose Black-spot | 4 | 2020 |
| fungus | Disciotis venosa | Bleach Cup | 12 | 2019 |
| fungus | Discocistella grevillei | an ascomycete fungus | 1 | 1999 |
| fungus | Ditiola peziziformis | a basidiomycete fungus | 1 | 2000 |
| fungus | Dothidella ulmi | a fungus | 3 | 2018 |
| harvestman | Dicranopalpus ramosus (sensu lato (pre 2015)) | a harvestman | 58 | 2023 |
| leech, flatworm or ribbon worm | Dendrocoelum | a Dendrocoelum species (unidentified) | 1 | 1993 |
| leech, flatworm or ribbon worm | Dendrocoelum lacteum | a flatworm | 23 | 2019 |
| leech, flatworm or ribbon worm | Dugesia | a Dugesia species (unidentified) | 2 | 2016 |
| leech, flatworm or ribbon worm | Dugesiidae | a Dugesiidae species (unidentified) | 2 | 2023 |
| lichen | Dendrographa decolorans | a lichen | 3 | 2011 |
| lichen | Dermatocarpon miniatum | a lichen | 5 | 2025 |
| lichen | Dermatocarpon miniatum var. miniatum | a lichen | 2 | 2005 |
| lichen | Dimerella pineti | a lichen | 2 | 1991 |
| lichen | Diploicia canescens | a lichen | 25 | 2020 |
| lichen | Diploschistes gypsaceus | a lichen | 1 | 1988 |
| lichen | Diploschistes scruposus | a lichen | 3 | 2016 |
| lichen | Diplotomma alboatrum | a lichen | 18 | 2016 |
| lichen | Diplotomma hedinii | a lichen | 3 | 2014 |
| lichen | Diplotomma venustum | a lichen | 2 | 2004 |
| lichen | Dirina massiliensis f. sorediata (sensu auct. brit.) | a lichen | 4 | 2011 |
| liverwort | Diplophyllum albicans | White Earwort | 4 | 2022 |
| mammal | Dama dama | Fallow Deer | 40 | 2020 |
| mammal - marine | Delphinus delphis | Common Dolphin | 2 | 2024 |
| millipede | Diplopoda | a millipede (unidentified) | 20 | 2023 |
| mollusc | Deroceras | a Deroceras slug (unidentified) | 3 | 2023 |
| mollusc | Deroceras (Deroceras) agreste | Field Slug | 1 | 2019 |
| mollusc | Deroceras (Deroceras) invadens | Chestnut Slug | 6 | 2023 |
| mollusc | Deroceras (Deroceras) laeve | Marsh Slug | 4 | 1999 |
| mollusc | Deroceras (Deroceras) reticulatum | Netted Slug | 73 | 2023 |
| mollusc | Discus (Gonyodiscus) rotundatus | Rounded Snail | 113 | 2024 |
| mollusc | Dreissena polymorpha | Zebra Mussel | 2 | 2019 |
| moss | Dialytrichia mucronata | Pointed Lattice-moss | 2 | 2023 |
| moss | Dicranella heteromalla | Silky Forklet-moss | 35 | 2023 |
| moss | Dicranella schreberiana | Schreber's Forklet-moss | 9 | 2023 |
| moss | Dicranella staphylina | Field Forklet-moss | 1 | 2015 |
| moss | Dicranella varia | Variable Forklet-moss | 16 | 2023 |
| moss | Dicranoweisia cirrata | Common Pincushion | 30 | 2023 |
| moss | Dicranum | a Dicranum species (unidentified) | 1 | 1932 |
| moss | Dicranum bonjeanii | Crisped Fork-moss | 2 | 1991 |
| moss | Dicranum montanum | Mountain Fork-moss | 7 | 2000 |
| moss | Dicranum scoparium | Broom Fork-moss | 66 | 2023 |
| moss | Dicranum spurium | Rusty Fork-moss | 1 | 2023 |
| moss | Didymodon | a Didymodon species (unidentified) | 1 | 2023 |
| moss | Didymodon fallax | Fallacious Beard-moss | 108 | 2023 |
| moss | Didymodon icmadophilus (sensu J. Ku?era) | Slender Beard-moss | 1 | 2011 |
| moss | Didymodon insulanus | Cylindric Beard-moss | 94 | 2023 |
| moss | Didymodon luridus | Dusky Beard-moss | 33 | 2023 |
| moss | Didymodon nicholsonii | Nicholson's Beard-moss | 30 | 2023 |
| moss | Didymodon rigidulus | Rigid Beard-moss | 36 | 2023 |
| moss | Didymodon sinuosus | Wavy Beard-moss | 30 | 2023 |
| moss | Didymodon tophaceus | Olive Beard-moss | 16 | 2023 |
| moss | Didymodon vinealis | Soft-tufted Beard-moss | 71 | 2023 |
| moss | Distichium capillaceum | Fine Distichium | 1 | 1963 |
| moss | Ditrichum | a Ditrichum species (unidentified) | 1 | 1997 |
| moss | Ditrichum flexicaule | Bendy Ditrichum | 9 | 2005 |
| moss | Ditrichum gracile | Slender Ditrichum | 11 | 2023 |
| moss | Drepanocladus aduncus | Kneiff's Hook-moss | 11 | 2022 |
| moss | Drepanocladus polygamus | Fertile Feather-moss | 1 | 1963 |
| moth or butterfly - butterfly | Danaus plexippus | Monarch (or Milkweed) | 6 | 2007 |
| moth or butterfly - butterfly | Dryas julia subsp. delila | Julia | 1 | 2015 |
| moth or butterfly - macro moth | Daphnis nerii | Oleander Hawk-moth | 2 | 2001 |
| moth or butterfly - macro moth | Dasypolia templi | Brindled Ochre | 4 | 1981 |
| moth or butterfly - macro moth | Deilephila elpenor | Elephant Hawk-moth | 2586 | 2025 |
| moth or butterfly - macro moth | Deilephila porcellus | Small Elephant Hawk-moth | 441 | 2024 |
| moth or butterfly - macro moth | Deileptenia ribeata | Satin Beauty | 52 | 2024 |
| moth or butterfly - macro moth | Deltote pygarga | Marbled White Spot | 203 | 2024 |
| moth or butterfly - macro moth | Deltote uncula | Silver Hook | 1 | 1981 |
| moth or butterfly - macro moth | Denticucullus pygmina | Small Wainscot | 39 | 2018 |
| moth or butterfly - macro moth | Diachrysia chrysitis | Burnished Brass | 1779 | 2024 |
| moth or butterfly - macro moth | Diaphora mendica | Muslin Moth | 1590 | 2024 |
| moth or butterfly - macro moth | Diarsia brunnea | Purple Clay | 207 | 2024 |
| moth or butterfly - macro moth | Diarsia dahlii | Barred Chestnut | 6 | 2007 |
| moth or butterfly - macro moth | Diarsia mendica | Ingrailed Clay | 624 | 2024 |
| moth or butterfly - macro moth | Diarsia mendica mendica | an Ingrailed Clay | 179 | 2024 |
| moth or butterfly - macro moth | Diarsia rubi | Small Square-spot | 2385 | 2024 |
| moth or butterfly - macro moth | Diloba caeruleocephala | Figure of Eight | 85 | 2024 |
| moth or butterfly - macro moth | Drepana falcataria | Pebble Hook-tip | 389 | 2024 |
| moth or butterfly - macro moth | Drepana falcataria subsp. falcataria | a Pebble Hook-tip | 4 | 2014 |
| moth or butterfly - macro moth | Drymonia dodonaea | Marbled Brown | 9 | 2022 |
| moth or butterfly - macro moth | Drymonia ruficornis | Lunar Marbled Brown | 200 | 2023 |
| moth or butterfly - macro moth | Dryobota labecula | Oak Rustic | 4 | 2024 |
| moth or butterfly - macro moth | Dryobotodes eremita | Brindled Green | 98 | 2023 |
| moth or butterfly - macro moth | Dypterygia scabriuscula | Bird's Wing | 6 | 1995 |
| moth or butterfly - macro moth | Dysstroma citrata | a moth | 4 | 2015 |
| moth or butterfly - macro moth | Dysstroma citrata citrata | Dark Marbled Carpet | 53 | 2022 |
| moth or butterfly - macro moth | Dysstroma truncata | Common Marbled Carpet | 4592 | 2025 |
| moth or butterfly - micro moth | Dahlica inconspicuella | Lesser Lichen Case-bearer | 1 | 2016 |
| moth or butterfly - micro moth | Delplanqueia | a Delplanqueia pyralid moth (unidentified) | 1 | 2020 |
| moth or butterfly - micro moth | Delplanqueia dilutella | a pyralid moth | 70 | 2024 |
| moth or butterfly - micro moth | Delplanqueia inscriptella | Thyme Knot-horn | 1 | 2024 |
| moth or butterfly - micro moth | Depressaria badiella | a micro-moth | 3 | 2003 |
| moth or butterfly - micro moth | Depressaria chaerophylli | a micro-moth | 4 | 2021 |
| moth or butterfly - micro moth | Depressaria daucella | a micro-moth | 77 | 2024 |
| moth or butterfly - micro moth | Depressaria douglasella | a micro-moth | 3 | 1994 |
| moth or butterfly - micro moth | Depressaria pimpinellae | a micro-moth | 1 | 2009 |
| moth or butterfly - micro moth | Depressaria pulcherrimella | a micro-moth | 1 | 1991 |
| moth or butterfly - micro moth | Depressaria radiella | Parsnip Moth | 103 | 2024 |
| moth or butterfly - micro moth | Depressaria ultimella | a micro-moth | 9 | 2023 |
| moth or butterfly - micro moth | Diasemia reticularis | a pyralid moth | 1 | 1956 |
| moth or butterfly - micro moth | Diasemiopsis ramburialis | a pyralid moth | 1 | 2014 |
| moth or butterfly - micro moth | Dichomeris alacella | a micro-moth | 3 | 2022 |
| moth or butterfly - micro moth | Dichomeris marginella | Juniper Webber | 64 | 2023 |
| moth or butterfly - micro moth | Dichrorampha | a Dichrorampha species (unidentified) | 6 | 2021 |
| moth or butterfly - micro moth | Dichrorampha acuminatana | a tortrix moth | 63 | 2024 |
| moth or butterfly - micro moth | Dichrorampha aeratana | a tortrix moth | 6 | 2021 |
| moth or butterfly - micro moth | Dichrorampha alpinana | a tortrix moth | 31 | 2023 |
| moth or butterfly - micro moth | Dichrorampha flavidorsana | a tortrix moth | 4 | 2014 |
| moth or butterfly - micro moth | Dichrorampha petiverella | Common Drill | 21 | 2022 |
| moth or butterfly - micro moth | Dichrorampha plumbagana | a tortrix moth | 4 | 2016 |
| moth or butterfly - micro moth | Dichrorampha plumbana | a tortrix moth | 16 | 2020 |
| moth or butterfly - micro moth | Dichrorampha senectana | a tortrix moth | 3 | 2010 |
| moth or butterfly - micro moth | Dichrorampha sequana | a tortrix moth | 5 | 2023 |
| moth or butterfly - micro moth | Dichrorampha simpliciana | a tortrix moth | 9 | 2023 |
| moth or butterfly - micro moth | Dichrorampha vancouverana | a tortrix moth | 8 | 2023 |
| moth or butterfly - micro moth | Digitivalva pulicariae | a micro-moth | 47 | 2024 |
| moth or butterfly - micro moth | Dioryctria | a Dioryctria species (unidentified) | 6 | 2021 |
| moth or butterfly - micro moth | Dioryctria abietella | a pyralid moth | 41 | 2023 |
| moth or butterfly - micro moth | Dioryctria schuetzeella | a pyralid moth | 2 | 2024 |
| moth or butterfly - micro moth | Dioryctria simplicella | a pyralid moth | 1 | 2020 |
| moth or butterfly - micro moth | Dioryctria sylvestrella | a moth | 8 | 2022 |
| moth or butterfly - micro moth | Diplodoma laichartingella | a bagworm moth | 1 | 2015 |
| moth or butterfly - micro moth | Ditula angustiorana | Red-barred Tortrix | 431 | 2025 |
| moth or butterfly - micro moth | Diurnea fagella | March Tubic | 288 | 2024 |
| moth or butterfly - micro moth | Diurnea lipsiella | a micro-moth | 2 | 2010 |
| moth or butterfly - micro moth | Dolicharthria punctalis | a pyralid moth | 1 | 1906 |
| moth or butterfly - micro moth | Donacaula forficella | a pyralid moth | 51 | 2024 |
| moth or butterfly - micro moth | Donacaula mucronella | a pyralid moth | 3 | 2023 |
| moth or butterfly - micro moth | Duponchelia fovealis | a pyralid moth | 2 | 2020 |
| moth or butterfly - micro moth | Dyseriocrania subpurpurella | a micro-moth | 60 | 2023 |
| plant | Dactylis | a Dactylis species (unidentified) | 2 | 2014 |
| plant | Dactylis glomerata | Cock's-foot | 8189 | 2025 |
| plant | Dactylis glomerata subsp. glomerata | a flowering plant | 1 | 1921 |
| plant | Dactylorhiza | a Dactylorhiza orchid (unidentified) | 24 | 2023 |
| plant | Dactylorhiza fuchsii | Common Spotted-orchid | 1450 | 2025 |
| plant | Dactylorhiza fuchsii x maculata = D. x transiens | a marsh-orchid | 6 | 2009 |
| plant | Dactylorhiza fuchsii x praetermissa = D. x grandis | a marsh-orchid | 23 | 2019 |
| plant | Dactylorhiza incarnata | Early Marsh-orchid | 2 | 1986 |
| plant | Dactylorhiza incarnata subsp. incarnata | an early marsh-orchid | 2 | 1946 |
| plant | Dactylorhiza kerryensis | Western Marsh-orchid | 3 | 1999 |
| plant | Dactylorhiza maculata | Heath Spotted-orchid | 97 | 2019 |
| plant | Dactylorhiza maculata subsp. ericetorum | a heath spotted-orchid | 28 | 2011 |
| plant | Dactylorhiza maculata x praetermissa = D. x hallii | a marsh-orchid | 5 | 2015 |
| plant | Dactylorhiza praetermissa | Southern Marsh-orchid | 344 | 2024 |
| plant | Dactylorhiza traunsteinerioides | Narrow-leaved Marsh-orchid | 18 | 2011 |
| plant | Dahlia | a Dahlia species (unidentified) | 2 | 1971 |
| plant | Danthonia decumbens | Heath-grass | 258 | 2024 |
| plant | Daphne | a Daphne species (unidentified) | 1 | 1993 |
| plant | Daphne laureola | Spurge-laurel | 423 | 2024 |
| plant | Daphne mezereum | Mezereon | 3 | 1991 |
| plant | Darmera peltata | Indian Rhubarb | 3 | 2023 |
| plant | Datura ferox | Angel's-trumpets | 2 | 1957 |
| plant | Datura stramonium | Thorn-apple | 41 | 2020 |
| plant | Daucus | a Daucus species (unidentified) | 1 | 2011 |
| plant | Daucus carota | Wild Carrot | 2503 | 2024 |
| plant | Daucus carota subsp. carota | a wild carrot | 247 | 2023 |
| plant | Davidia involucrata | Dove-tree | 10 | 2023 |
| plant | Deschampsia | a Deschampsia species (unidentified) | 1 | 1984 |
| plant | Deschampsia cespitosa | Tufted Hair-grass | 2241 | 2024 |
| plant | Deschampsia cespitosa subsp. alpina | Alpine Hair-grass | 2 | 2005 |
| plant | Deschampsia cespitosa subsp. cespitosa | a tufted hair-grass | 2 | 2005 |
| plant | Deschampsia cespitosa subsp. parviflora | a tufted hair-grass | 1 | 1923 |
| plant | Deschampsia flexuosa | Wavy Hair-grass | 84 | 2019 |
| plant | Descurainia pinnata | Tansy-mustard | 1 | 1922 |
| plant | Descurainia sophia | Flixweed | 9 | 2003 |
| plant | Deutzia × magnifica | a Deutzia shrub | 1 | 1984 |
| plant | Dianthus armeria | Deptford Pink | 1 | 1936 |
| plant | Dianthus barbatus | Sweet William | 6 | 2019 |
| plant | Dianthus deltoides | Maiden Pink | 4 | 2008 |
| plant | Dianthus gratianopolitanus | Cheddar Pink | 18 | 2018 |
| plant | Digitalis | a Digitalis species (unidentified) | 4 | 2017 |
| plant | Digitalis lutea | Straw Foxglove | 4 | 2017 |
| plant | Digitalis purpurea | Foxglove | 947 | 2024 |
| plant | Digitaria ciliaris | Tropical Finger-grass | 1 | 1984 |
| plant | Digitaria ischaemum | Smooth Finger Grass | 1 | 2013 |
| plant | Digitaria sanguinalis | Hairy Finger-grass | 31 | 2017 |
| plant | Dioscorea communis | Black Bryony | 3928 | 2024 |
| plant | Diplotaxis | a wall-rocket (unidentified) | 12 | 2018 |
| plant | Diplotaxis erucoides | White Wall-rocket | 2 | 2019 |
| plant | Diplotaxis muralis | Annual Wall-rocket | 349 | 2024 |
| plant | Diplotaxis tenuifolia | Perennial Wall-rocket | 283 | 2024 |
| plant | Diplotaxis tenuisiliqua | a wall-rocket | 1 | 2003 |
| plant | Dipsacus | a teasel (unidentified) | 74 | 2023 |
| plant | Dipsacus fullonum | Wild Teasel | 3694 | 2025 |
| plant | Dipsacus fullonum (sensu lato) | Wild Teasel sens. lat. | 52 | 2010 |
| plant | Dipsacus laciniatus | a flowering plant | 2 | 2023 |
| plant | Dipsacus pilosus | Small Teasel | 335 | 2024 |
| plant | Dipsacus sativus | Fuller's Teasel | 1 | 1931 |
| plant | Dittrichia graveolens | Stinking Fleabane | 2 | 1934 |
| plant | Doronicum pardalianches | Leopard's-bane | 31 | 2019 |
| plant | Dorycnium hirsutum | Canary Clover | 2 | 2004 |
| plant | Draba muralis | Wall Whitlowgrass | 15 | 2018 |
| plant | Dracocephalum parviflorum | a flowering plant | 2 | 1931 |
| plant | Dracunculus vulgaris | Dragon Arum | 2 | 2019 |
| plant | Dryopteridaceae | a Dryopteridaceae species (unidentified) | 1 | 2023 |
| plant | Dryopteris | a buckler-fern (unidentified) | 14 | 2023 |
| plant | Dryopteris affinis | Scaly Male Fern | 444 | 2024 |
| plant | Dryopteris affinis subsp. affinis | a buckler-fern | 14 | 2024 |
| plant | Dryopteris borreri | a buckler-fern | 19 | 2023 |
| plant | Dryopteris cambrensis | a buckler-fern | 1 | 2022 |
| plant | Dryopteris carthusiana | Narrow Buckler-fern | 30 | 2021 |
| plant | Dryopteris dilatata | Broad Buckler-fern | 1505 | 2024 |
| plant | Dryopteris filix-mas | Male Fern | 3057 | 2024 |
| plant | Dryopteris filix-mas agg. | Male Fern agg. | 333 | 2023 |
| plant | Dryopteris submontana | Rigid Buckler Fern | 1 | 1834 |
| plant | Dryopteris x complexa nothosubsp. Complexa | a buckler-fern | 1 | 2007 |
| sea-fan, sea anemone or jellyfish | Diadumene lineata | Orange-striped Anemone | 1 | 2016 |
| sea-fan, sea anemone or jellyfish | Dynamena pumila | a Sea-fan/Sea Anemone/Jellyfish | 1 | 1937 |
| slime mould | Diderma hemisphaericum | a slime mould | 2 | 2005 |
| slime mould | Diderma spumarioides | a slime mould | 2 | 2008 |
| slime mould | Didymium | a Didymium species (unidentified) | 1 | 1997 |
| slime mould | Didymium bahiense | a slime mould | 1 | 1995 |
| slime mould | Didymium difforme | a slime mould | 4 | 2008 |
| slime mould | Didymium megalosporum | a slime mould | 1 | 2006 |
| slime mould | Didymium melanospermum | a slime mould | 1 | 2017 |
| slime mould | Didymium squamulosum | a slime mould | 8 | 2008 |
| spider | Diaea dorsata | a crab spider | 14 | 2024 |
| spider | Dictyna | a Dictyna species (unidentified) | 4 | 2023 |
| spider | Dictyna arundinacea | a mesh webbed spider | 24 | 2013 |
| spider | Dictyna latens | a mesh webbed spider | 2 | 1999 |
| spider | Dictyna uncinata | a mesh webbed spider | 9 | 1999 |
| spider | Dicymbium nigrum | a money spider | 7 | 2019 |
| spider | Diplocephalus cristatus | a money spider | 1 | 1991 |
| spider | Diplocephalus latifrons | a money spider | 2 | 1997 |
| spider | Diplocephalus permixtus | a money spider | 1 | 1988 |
| spider | Diplocephalus picinus | a money spider | 8 | 1996 |
| spider | Diplostyla concolor | a money spider | 19 | 2003 |
| spider | Dismodicus bifrons | a money spider | 3 | 1999 |
| spider | Dolomedes fimbriatus | Raft Spider | 1 | 2002 |
| spider | Drapetisca socialis | a money spider | 6 | 2012 |
| spider | Drassodes cupreus | a ground spider | 8 | 2020 |
| spider | Drassodes lapidosus | a ground spider | 13 | 2020 |
| spider | Drassodes lapidosus/cupreus | a ground spider | 1 | 2012 |
| spider | Drassodes pubescens | a ground spider | 2 | 1989 |
| spider | Drassyllus pusillus | a ground spider | 3 | 2003 |
| spider | Dysdera | a Woodlouse Spider (unidentified) | 3 | 2017 |
| spider | Dysdera crocata | Woodlouse Spider | 53 | 2024 |
| spider | Dysdera erythrina | a Woodlouse Spider | 19 | 2018 |
| spider | Dysderidae | a Dysderidae species (unidentified) | 2 | 2023 |
| springtail | Deuterosminthurus pallipes | a springtail (Collembola) | 6 | 2021 |
| springtail | Dicyrtoma fusca | a springtail (Collembola) | 1 | 2020 |
| springtail | Dicyrtomidae | a Dicyrtomidae species (unidentified) | 1 | 2014 |
| springtail | Dicyrtomina | a Dicyrtomina species (unidentified) | 3 | 2023 |
| springtail | Dicyrtomina ornata | a springtail (Collembola) | 2 | 2023 |
| springtail | Dicyrtomina saundersi | a springtail (Collembola) | 9 | 2020 |
| true fly - | Dasineura | a Dasineura species (unidentified) | 1 | 2018 |
| true fly - | Dasiops mucronatus | a fly | 2 | 2013 |
| true fly - | Dasiops spatiosus | a fly | 1 | 1948 |
| true fly - | Delia | a Delia species (unidentified) | 7 | 2013 |
| true fly - | Delia florilega | a fly | 10 | 2013 |
| true fly - | Delia lamelliseta | a fly | 1 | 2004 |
| true fly - | Delia platura | a fly | 27 | 2020 |
| true fly - | Desmometopa sordida | a fly | 1 | 2004 |
| true fly - | Dexia rustica | a parasitic fly | 1 | 2021 |
| true fly - | Dexiosoma caninum | a parasitic fly | 5 | 2013 |
| true fly - | Diastata adusta | a fly | 3 | 2009 |
| true fly - | Diastata costata | a fly | 1 | 2009 |
| true fly - | Diastata fuscula | a fly | 19 | 2023 |
| true fly - | Dichetophora obliterata | a snail-killing fly | 3 | 2004 |
| true fly - | Dicraeus fennicus | a fly | 1 | 2008 |
| true fly - | Dicraeus ingratus | a fly | 7 | 2006 |
| true fly - | Dicraeus napaeus | a fly | 2 | 2002 |
| true fly - | Dicraeus scibilis | a fly | 5 | 2008 |
| true fly - | Dicraeus styriacus | a fly | 1 | 2006 |
| true fly - | Dicraeus tibialis | a fly | 9 | 2008 |
| true fly - | Dicraeus vagans | a fly | 21 | 2008 |
| true fly - | Dilophus bispinosus | a st mark's fly | 1 | 2020 |
| true fly - | Dilophus febrilis | Fever Fly | 92 | 2023 |
| true fly - | Dilophus femoratus | a st mark's fly | 1 | 2000 |
| true fly - | Dinera carinifrons | a parasitic fly | 1 | 1979 |
| true fly - | Diplonevra florescens | a scuttle fly | 2 | 2020 |
| true fly - | Diplonevra funebris | a scuttle fly | 3 | 2013 |
| true fly - | Diplonevra nitidula | a scuttle fly | 3 | 2008 |
| true fly - | Diplonevra pilosella | a scuttle fly | 3 | 2004 |
| true fly - | Diplotoxa messoria | a fly | 12 | 2022 |
| true fly - | Diptera | a true fly (unidentified) | 72 | 2023 |
| true fly - | Discocerina obscurella | a shore fly | 2 | 2000 |
| true fly - | Discomyza incurva | a shore fly | 6 | 2009 |
| true fly - | Ditrichophora calceata | a shore fly | 4 | 2001 |
| true fly - | Ditrichophora fuscella | a shore fly | 2 | 2000 |
| true fly - | Dixella | a Dixella species (unidentified) | 5 | 2013 |
| true fly - | Dolichopodidae | a Dolichopodidae fly species (unidentified) | 1 | 2008 |
| true fly - | Dolichopodinae | a Dolichopodinae species (unidentified) | 2 | 2021 |
| true fly - | Dorycera graminum | Phoenix Fly | 3 | 2014 |
| true fly - | Dorylomorpha hungarica | a big-headed fly | 6 | 2001 |
| true fly - | Dorylomorpha imparata | a big-headed fly | 1 | 2003 |
| true fly - | Dorylomorpha xanthopus | a big-headed fly | 2 | 2001 |
| true fly - | Drino lota | a parasitic fly | 1 | 2002 |
| true fly - | Drosophila busckii | a fruit fly | 1 | 2015 |
| true fly - | Drosophila confusa | a fruit fly | 4 | 2001 |
| true fly - | Drosophila helvetica | a fruit fly | 1 | 2006 |
| true fly - | Drosophila immigrans | a fruit fly | 2 | 2001 |
| true fly - | Drosophila melanogaster | a fruit fly | 1 | 2003 |
| true fly - | Drosophila obscura | a fruit fly | 4 | 2020 |
| true fly - | Drosophila phalerata | a fruit fly | 3 | 2003 |
| true fly - | Drosophila picta | a fruit fly | 2 | 2009 |
| true fly - | Drosophila subobscura | a fruit fly | 3 | 2021 |
| true fly - | Drosophila transversa | a fruit fly | 1 | 1997 |
| true fly - | Drosophila tristis | a fruit fly | 1 | 2000 |
| true fly - | Drosophilidae | a Drosophilidae species (unidentified) | 8 | 2018 |
| true fly - | Drymeia brumalis | a muscid fly | 1 | 1998 |
| true fly - | Dryomyza flaveola | a fly | 2 | 2003 |
| true fly - | Dryomyzidae | a Dryomyzidae species (unidentified) | 1 | 1997 |
| true fly - | Dufouria chalybeata | a parasitic fly | 2 | 2001 |
| true fly - | Dufouria nigrita | a parasitic fly | 3 | 2004 |
| true fly - cranefly | Dicranomyia autumnalis | a cranefly | 2 | 2021 |
| true fly - cranefly | Dicranomyia chorea | a cranefly | 21 | 2022 |
| true fly - cranefly | Dicranomyia fusca | a cranefly | 7 | 2022 |
| true fly - cranefly | Dicranomyia mitis (sensu lato) | a cranefly | 4 | 2003 |
| true fly - cranefly | Dicranomyia modesta | a cranefly | 36 | 2023 |
| true fly - cranefly | Dicranophragma adjunctum | a cranefly | 4 | 2022 |
| true fly - cranefly | Dicranota | a Dicranota cranefly (unidentified) | 11 | 2018 |
| true fly - cranefly | Dicranota claripennis | a cranefly | 4 | 2022 |
| true fly - cranefly | Dicranota lucidipennis | a cranefly | 2 | 2003 |
| true fly - cranefly | Dicranota pavida | a cranefly | 2 | 2003 |
| true fly - cranefly | Dicranota subtilis | a cranefly | 1 | 2003 |
| true fly - cranefly | Diogma glabrata | a cranefly | 3 | 2022 |
| true fly - (diptera) | Delia radicum | an insect - true fly (Diptera) | 4 | 2003 |
| true fly - (diptera) | Dicranomyia melleicauda subsp. complicata | an insect - true fly (Diptera) | 1 | 2009 |
| true fly - (diptera) | Dictenidia bimaculata | an insect - true fly (Diptera) | 2 | 2017 |
| true fly - (diptera) | Ditaeniella grisescens | an insect - true fly (Diptera) | 1 | 2001 |
| true fly - (diptera) | Dolichocephala oblongoguttata | an insect - true fly (Diptera) | 1 | 2003 |
| true fly - (diptera) | Drosophila suzukii | Spotted-Winged Drosophila | 40 | 2023 |
| true fly - hoverfly | Dasysyrphus albostriatus | a hoverfly | 28 | 2023 |
| true fly - hoverfly | Dasysyrphus pinastri | a hoverfly | 3 | 2006 |
| true fly - hoverfly | Dasysyrphus tricinctus | a hoverfly | 17 | 2021 |
| true fly - hoverfly | Dasysyrphus venustus (sensu lato) | a hoverfly | 30 | 2021 |
| true fly - hoverfly | Didea fasciata | a hoverfly | 4 | 2016 |
| true fly - midge, gnat or mosquito | Dasineura acrophila | a gall midge | 1 | 1999 |
| true fly - midge, gnat or mosquito | Dasineura crataegi | a gall midge | 1 | 2012 |
| true fly - midge, gnat or mosquito | Dasineura filipendulae | a gall midge | 1 | 1999 |
| true fly - midge, gnat or mosquito | Dasineura fraxinea | a gall midge | 2 | 2001 |
| true fly - midge, gnat or mosquito | Dasineura fraxini | a gall midge | 9 | 2023 |
| true fly - midge, gnat or mosquito | Dasineura marginemtorquens | a gall midge | 1 | 1999 |
| true fly - midge, gnat or mosquito | Dasineura pustulans | a gall midge | 2 | 2015 |
| true fly - midge, gnat or mosquito | Dasineura rosae | a gall midge | 1 | 1999 |
| true fly - midge, gnat or mosquito | Dasineura tiliae | a gall midge | 5 | 2023 |
| true fly - midge, gnat or mosquito | Dasineura ulmaria | a gall midge | 14 | 2021 |
| true fly - midge, gnat or mosquito | Dasineura urticae | Nettle Pouch Gall | 20 | 2021 |
| true fly - midge, gnat or mosquito | Diadocidia ferruginosa | a fungus gnat | 6 | 2001 |
| true fly - midge, gnat or mosquito | Diadocidia spinosula | a fungus gnat | 3 | 2000 |
| true fly - midge, gnat or mosquito | Didymomyia tiliacea | a gall midge | 3 | 2022 |
| true fly - midge, gnat or mosquito | Ditomyia fasciata | a fungus gnat | 2 | 2000 |
| true fly - midge, gnat or mosquito | Dixa nebulosa | a meniscus midge | 2 | 2023 |
| true fly - midge, gnat or mosquito | Dixa nubilipennis | a meniscus midge | 3 | 2003 |
| true fly - midge, gnat or mosquito | Dixa submaculata | a meniscus midge | 7 | 2023 |
| true fly - midge, gnat or mosquito | Dixella aestivalis | a meniscus midge | 34 | 2013 |
| true fly - midge, gnat or mosquito | Dixella amphibia | a meniscus midge | 16 | 2013 |
| true fly - midge, gnat or mosquito | Dixella attica | a meniscus midge | 2 | 2009 |
| true fly - midge, gnat or mosquito | Dixella autumnalis | a meniscus midge | 12 | 2004 |
| true fly - midge, gnat or mosquito | Dixella martinii | a meniscus midge | 1 | 1983 |
| true fly - midge, gnat or mosquito | Dixella serotina | a meniscus midge | 1 | 2009 |
| true fly - midge, gnat or mosquito | Dixidae | a meniscus midge (unidentified) | 19 | 2013 |
| true fly - midge, gnat or mosquito | Docosia fuscipes | a fungus gnat | 12 | 2021 |
| true fly - midge, gnat or mosquito | Docosia gilvipes | a fungus gnat | 1 | 2020 |
| true fly - midge, gnat or mosquito | Docosia moravica | a fungus gnat | 7 | 2021 |
| true fly - midge, gnat or mosquito | Docosia sciarina | a fungus gnat | 8 | 2021 |
| true fly - midge, gnat or mosquito | Dynatosoma reciprocum | a fungus gnat | 2 | 2020 |
| true fly - picture-winged, conopid or stilt-legged fly | Dithryca guttularis | a gall fly | 1 | 1990 |
| true fly - robber, empid or dolichopid fly | Diaphorus oculatus | a dolichopodid fly | 4 | 1999 |
| true fly - robber, empid or dolichopid fly | Dioctria atricapilla | Violet Black-legged Robberfly | 22 | 2022 |
| true fly - robber, empid or dolichopid fly | Dioctria baumhaueri | Stripe-legged Robberfly | 6 | 2023 |
| true fly - robber, empid or dolichopid fly | Dioctria linearis | Small Yellow-legged Robberfly | 9 | 2022 |
| true fly - robber, empid or dolichopid fly | Dioctria rufipes | Common Red-legged Robberfly | 26 | 2022 |
| true fly - robber, empid or dolichopid fly | Dolichocephala guttata | a dance fly | 1 | 2000 |
| true fly - robber, empid or dolichopid fly | Dolichocephala irrorata | a dance fly | 1 | 2001 |
| true fly - robber, empid or dolichopid fly | Dolichopus andalusiacus | a dolichopodid fly | 1 | 2009 |
| true fly - robber, empid or dolichopid fly | Dolichopus brevipennis | a dolichopodid fly | 4 | 2021 |
| true fly - robber, empid or dolichopid fly | Dolichopus campestris | a dolichopodid fly | 2 | 2002 |
| true fly - robber, empid or dolichopid fly | Dolichopus clavipes | a dolichopodid fly | 2 | 2016 |
| true fly - robber, empid or dolichopid fly | Dolichopus diadema | a dolichopodid fly | 2 | 2009 |
| true fly - robber, empid or dolichopid fly | Dolichopus festivus | a dolichopodid fly | 17 | 2023 |
| true fly - robber, empid or dolichopid fly | Dolichopus griseipennis | a dolichopodid fly | 49 | 2023 |
| true fly - robber, empid or dolichopid fly | Dolichopus latilimbatus | a dolichopodid fly | 11 | 2009 |
| true fly - robber, empid or dolichopid fly | Dolichopus nitidus | a dolichopodid fly | 1 | 2009 |
| true fly - robber, empid or dolichopid fly | Dolichopus notatus | a dolichopodid fly | 1 | 2009 |
| true fly - robber, empid or dolichopid fly | Dolichopus nubilus | a dolichopodid fly | 15 | 2009 |
| true fly - robber, empid or dolichopid fly | Dolichopus pennatus | a dolichopodid fly | 5 | 1983 |
| true fly - robber, empid or dolichopid fly | Dolichopus picipes | a dolichopodid fly | 4 | 2001 |
| true fly - robber, empid or dolichopid fly | Dolichopus planitarsis | a dolichopodid fly | 2 | 1984 |
| true fly - robber, empid or dolichopid fly | Dolichopus plumipes | a dolichopodid fly | 45 | 2022 |
| true fly - robber, empid or dolichopid fly | Dolichopus popularis | a dolichopodid fly | 9 | 2020 |
| true fly - robber, empid or dolichopid fly | Dolichopus simplex | a dolichopodid fly | 4 | 2000 |
| true fly - robber, empid or dolichopid fly | Dolichopus subpennatus | a dolichopodid fly | 1 | 1983 |
| true fly - robber, empid or dolichopid fly | Dolichopus trivialis | a dolichopodid fly | 36 | 2023 |
| true fly - robber, empid or dolichopid fly | Dolichopus ungulatus | a dolichopodid fly | 20 | 2023 |
| true fly - robber, empid or dolichopid fly | Dolichopus urbanus | a dolichopodid fly | 2 | 2001 |
| true fly - robber, empid or dolichopid fly | Dolichopus virgultorum | a dolichopodid fly | 3 | 2023 |
| true fly - robber, empid or dolichopid fly | Dolichopus vitripennis | a dolichopodid fly | 1 | 2021 |
| true fly - robber, empid or dolichopid fly | Dolichopus wahlbergi | a dolichopodid fly | 10 | 2008 |
| true fly - robber, empid or dolichopid fly | Drapetis exilis | a dance fly | 1 | 1979 |
| true fly - robber, empid or dolichopid fly | Drapetis pusilla | a dance fly | 1 | 2004 |
| true fly - robber, empid or dolichopid fly | Drapetis simulans | a dance fly | 2 | 2004 |
| true fly - robber, empid or dolichopid fly | Dysmachus trigonus | Fan-bristled Robberfly | 3 | 2016 |
| tunicate (urochordata) | Dendrodoa grossularia | Baked Bean Ascidian | 3 | 1995 |
| water flea | Daphnia | a Daphnia water flea (unidentified) | 47 | 2015 |
| water flea | Daphnia (Ctenodaphnia) magna | a water flea | 5 | 1984 |
| water flea | Daphnia (Daphnia) hyalina | a water flea | 2 | 1982 |
| water flea | Daphnia (Daphnia) longispina | a water flea | 7 | 1995 |
| water flea | Disparalona rostrata | a water flea | 1 | 1991 |
| worm | Dendrobaena attemsi | an earthworm | 5 | 2017 |
| worm | Dendrobaena hortensis | an earthworm | 5 | 2020 |
| worm | Dendrobaena octaedra | Octagonal-tailed Worm | 3 | 2017 |
| worm | Dendrobaena pygmaea | an earthworm | 1 | 2015 |
| worm | Dendrobaena veneta | an earthworm | 8 | 2020 |