| Acanthocnemidae Crowson, 1964 | | 1 | Species | Taxom |
| Acroceridae Leach, 1815 | Hunch-back flies | 9 | Species | Taxom |
| Adelidae Bruand, 1851 | Adelid Moths | 11 | Species | Taxom |
| Ademosynidae Ponomarenko, 1968 | | 8 | Species | Taxom |
| Aderidae Winkler, 1927 | Ant-like leaf beetles | 13 | Species | Taxom |
| Agaonidae Walker, 1848 | Fig wasp | 28 | Species | Taxom |
| Agromyzidae Fallen, 1823 | Leaf miner flies | 137 | Species | Taxom |
| Agyrtidae Thomson, 1859 | Primitive carrion beetles | 20 | Species | Taxom |
| Alloioscarabaeidae Bai & al., 2012 | | 1 | Species | Taxom |
| Alucitidae Leach, 1815 | Many Plumed Moths | 10 | Species | Taxom |
| Amphizoidae LeConte, 1853 | Stout-stream beetles | 3 | Species | Taxom |
| Ampulicidae Shuckard, 1840 | Ampulicid wasps | 6 | Species | Taxom |
| Anaxyelidae Martynov, 1925 | Anaxyelids | 3 | Species | Taxom |
| Andrenidae Webster, 1913 | Andrenid bees | 58 | Species | Taxom |
| Aneuretopsychidae Rasnitsyn & ..., 1990 | | 4 | Species | Taxom |
| Anisopodidae Knab, 1912 | Window Midges | 20 | Species | Taxom |
| Anomopterellidae (Rasnitsyn, 1975) | | 1 | Species | Taxom |
| Antefungivoridae Rohdendorf, 1938 | | 14 | Species | Taxom |
| Anthelidae Turner, 1904 | Australian Lappet Moths | 1 | Species | Taxom |
| Anthicidae Latreille, 1819 | Ant beetles | 57 | Species | Taxom |
| Anthomyiidae Robineau-Des..., 1830 | Anthomyiid flies | 530 | Species | Taxom |
| Anthomyzidae Czerny, 1903 | Anthomyzid flies | 3 | Species | Taxom |
| Anthophoridae (C. L. Koch, 1846) | | 1 | Species | Taxom |
| Anthribidae Billberg, 1820 | Fungus Weevil | 44 | Species | Taxom |
| Apataniidae Wallengren, 1886 | Early Smoky Wing Sedges | 45 | Species | Taxom |
| Aphelinidae Thomson, 1876 | Aphelinid wasps | 151 | Species | Taxom |
| Aphodiidae Leach, 1815 | | 3 | Species | Taxom |
| Apidae Latreille, 1802 | Bumble bees | 297 | Species | Taxom |
| Archeocrypticidae Kaszab, 1964 | Ancient Fungus Beetles | 1 | Species | Taxom |
| Archisargidae Rohdendorf, 1962 | | 29 | Species | Taxom |
| Arctiidae Leach, 1815 | Footman moths | 21 | Species | Taxom |
| Argidae Konow, 1890 | Argid flies | 51 | Species | Taxom |
| Artematopodidae Lacordaire, 1857 | Soft bodied plant beetle | 1 | Species | Taxom |
| Ascololepidopterigidae Zhang & al., 2013 | | 3 | Species | Taxom |
| Asilidae Latreille, 1802 | Assassin flies | 309 | Species | Taxom |
| Asiochaoboridae Hong & Wang, 1990 | | 4 | Species | Taxom |
| Asiocoleidae Rohdendorf, 1961 | | 1 | Species | Taxom |
| Aspidytidae Ribera, Beu..., 2002 | Cliff water beetles | 1 | Species | Taxom |
| Asteiidae Rondani, 1856 | Asteiid Flies | 1 | Species | Taxom |
| Athericidae Stuckenberg, 1973 | Athericid flies | 5 | Species | Taxom |
| Attelabidae Billberg, 1820 | Leaf Rolling Weevil | 795 | Species | Taxom |
| Aulacidae Shuckard, 1842 | Aulacid wasps | 7 | Species | Taxom |
| Autostichidae Le Marchand, 1947 | Autostichid Moths | 41 | Species | Taxom |
| Axymyiidae Rohdendorf, 1946 | Axymyiidae flies | 7 | Species | Taxom |
| Baissidae Rasnitsyn, 1975 | | 1 | Species | Taxom |
| Baissodidae Benton, 1993 | | 2 | Species | Taxom |
| Batrachedridae Heinemann & ..., 1876 | Batrachedrid Moths | 2 | Species | Taxom |
| Beraeidae Wallengren, 1891 | Small eastern caddisflies | 5 | Species | Taxom |
| Bethylidae Halliday, 1839 | Bethylid wasps | 27 | Species | Taxom |
| Bibionidae Fleming, 1821 | Bibionid flies | 143 | Species | Taxom |
| Biphyllidae LeConte, 1861 | Biphyllid beetles | 2 | Species | Taxom |
| Bittacidae Handlirsch, 1906 | Hanging scorpionflies | 48 | Species | Taxom |
| Blasticotomidae Thomson, 1871 | Blasticotomid sawflies | 3 | Species | Taxom |
| Blephariceridae Loew, 1861 | Mountain midges | 14 | Species | Taxom |
| Bombycidae Latreille, 1802 | Lappet moths | 44 | Species | Taxom |
| Bombyliidae Latreille, 1802 | Bee Flies | 153 | Species | Taxom |
| Bostrichidae Latreille, 1802 | Auger beetles | 52 | Species | Taxom |
| Bothrideridae Erichson, 1845 | Cocoon-forming beetles | 3 | Species | Taxom |
| Brachodidae Agenjo, 1966 | Little Bear Moths | 9 | Species | Taxom |
| Brachycentridae Ulmer, 1903 | Humpless Casemaker Caddisflies | 4 | Species | Taxom |
| Brachyceridae (Billberg, 1820) | Brachycerids | 1 | Species | Taxom |
| Brachyceritidae Hong, 2002 | | 1 | Species | Taxom |
| Brachypteridae (Erichson, 1845) | Short-winged Flower Beetles | 2 | Species | Taxom |
| Brachystomatidae Melander, 1908 | | 1 | Species | Taxom |
| Braconidae Latreille, 1829 | Braconid wasps | 274 | Species | Taxom |
| Bradynobaenidae Saussure, 1892 | Bradynobaenid wasps | 0 | Species | Taxom |
| Brahmaeidae Swinhoe, 1892 | Brahmin Moths | 11 | Species | Taxom |
| Brentidae Billberg, 1820 | Brenthidae | 45 | Species | Taxom |
| Buprestidae Leach, 1815 | Flat-headed wood-borers | 190 | Species | Taxom |
| Byrrhidae Latreille, 1804 | Moss beetles | 69 | Species | Taxom |
| Byturidae Jacquelin du..., 1858 | Fruit worms | 6 | Species | Taxom |
| Calamoceratidae Ulmer, 1905 | | 13 | Species | Taxom |
| Callidulidae Moore, 1877 | Old World Butterfly Moths | 6 | Species | Taxom |
| Calliphoridae Brauer & Ber..., 1889 | Blow flies | 245 | Species | Taxom |
| Callirhipidae Emden, 1924 | Callirhipid beetles | 4 | Species | Taxom |
| Canaceidae (Jones, 1906) | Beach flies | 4 | Species | Taxom |
| Cantharidae Imhoff, 1856 | Cantharids | 275 | Species | Taxom |
| Carabidae Latreille, 1802 | Carabid beetles | 5410 | Species | Taxom |
| Caridae Thompson, 1992 | | 11 | Species | Taxom |
| Carnidae Newman, 1834 | Bird flies | 1 | Species | Taxom |
| Carposinidae Walsingham, 1907 | Carposinid moths | 50 | Species | Taxom |
| Castniidae Boisduval, 1828 | Castniid moths | 1 | Species | Taxom |
| Cecidomyiidae Newman, 1834 | Cecidomyidae | 73 | Species | Taxom |
| Celyphidae Bigot, 1852 | Beetle flies | 32 | Species | Taxom |
| Cephidae Newman, 1834 | Cephids | 21 | Species | Taxom |
| Cerambycidae Latreille, 1802 | Long Horn beetles | 3689 | Species | Taxom |
| Ceraphronidae Haliday, 1833 | Ceraphronid wasps | 1 | Species | Taxom |
| Ceratophyllidae Dampf, 1908 | Bird Fleas | 113 | Species | Taxom |
| Ceratopogonidae Newman, 1834 | Biting midge | 393 | Species | Taxom |
| Cerophytidae Latreille, 1834 | Cerophytid beetles | 1 | Species | Taxom |
| Cerylonidae Billberg, 1820 | Cerylid Kingfishers | 3 | Species | Taxom |
| Cetoniidae (Leach, 1815) | Flower beetles | 1 | Species | Taxom |
| Chalcididae Latreille, 1817 | Chalcidid wasps | 44 | Species | Taxom |
| Chamaemyiidae Hendel, 1910 | Aphid flies | 6 | Species | Taxom |
| Chaoboridae Newman, 1834 | Phantom midge | 7 | Species | Taxom |
| Chironomidae Erichson, 1842 | Chironomids | 336 | Species | Taxom |
| Chloropidae Schoenherr, 1840 | Chloropid flies | 145 | Species | Taxom |
| Choreutidae Stainton, 1854 | Choreuitid Moths | 25 | Species | Taxom |
| Choristopsychidae Martynov, 1937 | | 4 | Species | Taxom |
| Chrysididae Latreille, 1802 | Chrysidid wasps | 46 | Species | Taxom |
| Chrysomelidae Latreille, 1802 | Casebearers | 936 | Species | Taxom |
| Ciidae Leach, 1819 | Minute tree fungus beetles | 12 | Species | Taxom |
| Cimbicidae Kirby, 1837 | Cimbicid sawflies | 55 | Species | Taxom |
| Cimbrophlebiidae Willmann, 1977 | Hangingfly | 8 | Species | Taxom |
| Cleridae Latreille, 1802 | Checkered Beetle | 33 | Species | Taxom |
| Coccinellidae Latreille, 1807 | Coccinelles | 146 | Species | Taxom |
| Coelocatiniidae Ponomarenko, 1968 | | 3 | Species | Taxom |
| Coleocatiniidae Ponomarenko ..., 2015 | | 1 | Species | Taxom |
| Coleophoridae Hübner, 1825 | Case moths | 137 | Species | Taxom |
| Colletidae Lepeletier, 1841 | Colletid bees | 60 | Species | Taxom |
| Conopidae Latreille, 1802 | Thick-headed Flies | 74 | Species | Taxom |
| Copromorphidae Meyrick, 1905 | Fig Borers | 3 | Species | Taxom |
| Coptoclavidae Ponomarenko, 1961 | Extinct family | 7 | Species | Taxom |
| Coptopsyllidae Wagner, 1928 | | 1 | Species | Taxom |
| Corylophidae LeConte, 1852 | Hooded beetles | 1 | Species | Taxom |
| Cosmopterigidae Heinemann & ..., 1876 | Cosmet Moths | 56 | Species | Taxom |
| Cossidae Leach, 1815 | Borers | 127 | Species | Taxom |
| Crabronidae Latreille, 1802 | Bee Wolves | 149 | Species | Taxom |
| Crambidae Latreille, 1810 | Crambid Snout Moths | 989 | Species | Taxom |
| Cretohisteridae | | 1 | Species | Taxom |
| Cryptochetidae Brues & Mela..., 1932 | Cryptochetid Flies | 3 | Species | Taxom |
| Cryptophagidae Kirby, 1937 | Mould beetles | 16 | Species | Taxom |
| Ctenophthalmidae Rothschild, 1915 | | 116 | Species | Taxom |
| Ctenuchidae (W. Kirby, 1837) | Ctenuchid moths | 0 | Species | Taxom |
| Cucujidae Latreille, 1802 | Flat bark beetles | 13 | Species | Taxom |
| Culicidae Meigen, 1818 | Mosquito | 273 | Species | Taxom |
| Cupedidae Laporte, 1836 | Cupedids | 59 | Species | Taxom |
| Curculionidae Latreille, 1802 | Ambrosia beetles | 1194 | Species | Taxom |
| Curtonotidae Duda, 1934 | Curtonotid flies | 1 | Species | Taxom |
| Cylindrotomidae (Mulsant, 1842) | Cylindrotomid Crane Flies | 2 | Species | Taxom |
| Cynipidae Latreille, 1802 | Cynipid gall wasps | 12 | Species | Taxom |
| Danaidae (Boisduval, 1833) | Milkweed Butterflies | 2 | Species | Taxom |
| Daohugoidae Rasnitsyn & ..., 2004 | | 1 | Species | Taxom |
| Dascillidae Guérin-Ménev..., 1843 | Orchid beetles | 41 | Species | Taxom |
| Dermestidae Hope, 1840 | Carpet beetles | 128 | Species | Taxom |
| Derodontidae LeConte, 1861 | Tooth-neck fungus beetles | 10 | Species | Taxom |
| Diapriidae Latreille, 1796 | Diapriid wasps | 9 | Species | Taxom |
| Diopsidae Billberg, 1820 | Stalk-eyed flies | 16 | Species | Taxom |
| Diprionidae Rohwer, 1911 | Conifer sawflies | 21 | Species | Taxom |
| Dipseudopsidae Ulmer, 1904 | | 12 | Species | Taxom |
| Discolomatidae Horn, 1878 | | 2 | Species | Taxom |
| Dixidae Schiner, 1868 | Dixid Midges | 8 | Species | Taxom |
| Dolichopodidae Latreille, 1809 | Long legged flies | 672 | Species | Taxom |
| Douglasiidae Heinemann & ..., 1876 | Douglas Moths | 1 | Species | Taxom |
| Drepanidae Meyrick, 1895 | Drepanids | 173 | Species | Taxom |
| Drosophilidae Rondani, 1856 | Fruit flies | 437 | Species | Taxom |
| Dryinidae Haliday, 1840 | Dryinid wasps | 1 | Species | Taxom |
| Dryomyzidae Schiner, 1862 | Dryomyzid flies | 3 | Species | Taxom |
| Dryopidae Billberg, 1820 | Long toed water beetle | 19 | Species | Taxom |
| Dytiscidae Leach, 1815 | Diving beetles | 124 | Species | Taxom |
| Ecnomidae Ulmer, 1903 | | 24 | Species | Taxom |
| Elachistidae Bruand, 1851 | Elachistid moths | 123 | Species | Taxom |
| Elateridae Leach, 1815 | Click Beetle | 719 | Species | Taxom |
| Elenchidae Perkins, 1905 | | 1 | Species | Taxom |
| Elmidae Curtis, 1830 | Drive beetles | 80 | Species | Taxom |
| Empididae Latreille, 1809 | Balloon flies | 116 | Species | Taxom |
| Encyrtidae Walker, 1837 | Encyrtid wasps | 233 | Species | Taxom |
| Endomychidae Leach, 1815 | False Ladybirds | 63 | Species | Taxom |
| Endromidae Boisduval, 1828 | Glory Moths | 1 | Species | Taxom |
| Eolepidopterigidae Rasnitsyn, 1983 | | 8 | Species | Taxom |
| Eomeropidae Cockerell, 1909 | | 5 | Species | Taxom |
| Eostephanitidae Hong, 2002 | | 1 | Species | Taxom |
| Epermeniidae Spuler, 1910 | Epermeniid moths | 4 | Species | Taxom |
| Ephialtitidae Handlirsch, 1906 | | 19 | Species | Taxom |
| Ephydridae Zetterstedt, 1837 | Brine flies | 76 | Species | Taxom |
| Epicopeiidae Swinhoe, 1892 | Oriental Swallowtail Moths | 2 | Species | Taxom |
| Epipyropidae Dyar, 1903 | Planthopper Parasite Moths | 1 | Species | Taxom |
| Erebidae Leach, 1815 | Erebid Moths | 1387 | Species | Taxom |
| Eremazidae Iablokoff-Kh..., 1977 | | 3 | Species | Taxom |
| Eremochaetidae Ussatchov, 1968 | | 10 | Species | Taxom |
| Eriocottidae Spuler, 1898 | Old World Spiny Winged Moths | 1 | Species | Taxom |
| Erotylidae Latreille, 1802 | Pleasing Fungus Beetle | 23 | Species | Taxom |
| Eucharitidae Latreille, 1809 | Eucharitid wasp | 5 | Species | Taxom |
| Eucinetidae Lacordaire, 1857 | Plate-thigh beetle | 3 | Species | Taxom |
| Eucnemidae Eschscholtz, 1829 | Click Beetles | 18 | Species | Taxom |
| Eulichadidae Crowson, 1973 | Forest stream beetle | 7 | Species | Taxom |
| Eulophidae Westwood, 1829 | Eulophid wasps | 208 | Species | Taxom |
| Eupelmidae Walker, 1833 | Eupelmid wasps | 35 | Species | Taxom |
| Eupterotidae Swinhoe, 1892 | Giant Lappet Moths | 9 | Species | Taxom |
| Eurytomidae Walker, 1832 | Eurytomid wasps | 41 | Species | Taxom |
| Euteliidae Grote, 1882 | Euteliid Moths | 18 | Species | Taxom |
| Evaniidae Latreille, 1802 | Ensign wasp | 5 | Species | Taxom |
| Expansicornidae Hong, 2002 | | 1 | Species | Taxom |
| Falsiformicidae Rasnitsyn, 1975 | | 1 | Species | Taxom |
| Fanniidae Schnabl & Dz..., 1911 | Latrine flies | 67 | Species | Taxom |
| Figitidae Thomson, 1862 | Figitid wasps | 12 | Species | Taxom |
| Formicidae Latreille, 1809 | Ant | 1958 | Species | Taxom |
| Fungivoritidae Rohdendorf, 1957 | | 6 | Species | Taxom |
| Gasteruptiidae Ashmead, 1900 | Carrot Wasps | 3 | Species | Taxom |
| Gelechiidae Stainton, 1854 | Gelechiid moths | 256 | Species | Taxom |
| Geometridae Leach, 1815 | Cankerworm moths | 1572 | Species | Taxom |
| Geotrupidae Latreille, 1802 | Dor beetles | 235 | Species | Taxom |
| Glaphyridae MacLeay, 1819 | Bumble bee scarab beetle | 51 | Species | Taxom |
| Glaphyropteridae Pongracz, 1935 | | 1 | Species | Taxom |
| Glaresidae Kolbe, 1905 | Enigmatic scarab beetle | 5 | Species | Taxom |
| Glossosomatidae Wallengren, 1891 | Little Black Caddisflies | 58 | Species | Taxom |
| Glyphipterigidae Stainton, 1854 | Glyphipterigid moths | 20 | Species | Taxom |
| Goeridae Ulmer, 1903 | | 34 | Species | Taxom |
| Gracillariidae Stainton, 1854 | Blotch leaf miner moths | 167 | Species | Taxom |
| Gyrinidae Latreille, 1802 | Whirligig beetle | 33 | Species | Taxom |
| Halictidae Thomson, 1869 | Flower bees | 137 | Species | Taxom |
| Halictophagidae Perkins, 1905 | | 10 | Species | Taxom |
| Haliplidae Aubé, 1836 | Crawling Water Beetle | 21 | Species | Taxom |
| Heleomyzidae (Westwood, 1840) | Heleomyzid flies | 21 | Species | Taxom |
| Helicopsychidae Ulmer, 1912 | Snail Case caddisflies | 2 | Species | Taxom |
| Heliozelidae Heinemann & ..., 1876 | Leaf miners | 2 | Species | Taxom |
| Helophoridae (Leach, 1815) | Water scavenger beetles | 1 | Species | Taxom |
| Heloridae Förster, 1856 | Helorid wasps | 12 | Species | Taxom |
| Helotidae Reitter, 1876 | | 19 | Species | Taxom |
| Hennigmatidae Shcherbakov, 1995 | | 1 | Species | Taxom |
| Hepialidae Stephens, 1829 | Ghost Moths | 114 | Species | Taxom |
| Hesperiidae Latreille, 1809 | Indet. Skipper | 467 | Species | Taxom |
| Hesperinidae Hendel, 1928 | | 1 | Species | Taxom |
| Heteroceridae MacLeay, 1825 | Mud beetles | 11 | Species | Taxom |
| Hippoboscidae Samouelle, 1819 | Keds | 19 | Species | Taxom |
| Histeridae Gyllenhal, 1808 | Clown beetle | 214 | Species | Taxom |
| Holcorpidae Willmann, 1989 | | 2 | Species | Taxom |
| Huaxiasciaritidae (Hong, 2002) | | 28 | Species | Taxom |
| Hyblaeidae Hampson, 1903 | Teak Moths | 4 | Species | Taxom |
| Hybosoridae Erichson, 1847 | Pill scarab beetles | 25 | Species | Taxom |
| Hybotidae Meigen, 1820 | Dance flies | 152 | Species | Taxom |
| Hydraenidae Mulsant, 1844 | Cascade Beetles | 94 | Species | Taxom |
| Hydrobiosidae Ulmer, 1905 | | 96 | Species | Taxom |
| Hydrophilidae Latreille, 1802 | Silver Water Beetles | 474 | Species | Taxom |
| Hydropsychidae Curtis, 1835 | Net Spinning caddisflies | 123 | Species | Taxom |
| Hydroptilidae Stephens, 1836 | Micro caddisflies | 253 | Species | Taxom |
| Hydroscaphidae LeConte, 1874 | Skiff beetle | 2 | Species | Taxom |
| Hygrobiidae Régimbart, 1878 | Screech beetles | 1 | Species | Taxom |
| Hystrichopsyllidae Tiraboschi, 1904 | Insectivore fleas | 13 | Species | Taxom |
| Ichneumonidae Latreille, 1802 | Ichneumon flies | 215 | Species | Taxom |
| Ichneumonomimidae Rasnitsyn, 1975 | | 1 | Species | Taxom |
| Immidae Heppner, 1977 | Imma Moths | 6 | Species | Taxom |
| Incurvariidae Spuler, 1898 | Fairy moths | 1 | Species | Taxom |
| Ironomyiidae McAlpine & M..., 1966 | Ironic flies | 2 | Species | Taxom |
| Ischnopsyllidae Wahlgren, 1907 | Bat fleas | 18 | Species | Taxom |
| Jacobsoniidae Heller, 1926 | Jacobson's beetles | 2 | Species | Taxom |
| Jurodidae Ponomarenko, 1985 | Jurodids | 2 | Species | Taxom |
| Karatavitidae Rasnitsyn, 1963 | | 17 | Species | Taxom |
| Kateretidae Kirkby, 1837 | Pollen Beetles | 1 | Species | Taxom |
| Keroplatidae Rondani, 1856 | Fungus gnats | 27 | Species | Taxom |
| Kovalevisargidae Mostovski, 1997 | | 4 | Species | Taxom |
| Kuafuidae Rasnitsyn & ..., 2010 | | 1 | Species | Taxom |
| Lampyridae Latreille, 1817 | Fireflies | 44 | Species | Taxom |
| Lasiocampidae Harris, 1841 | Eggar Moths | 54 | Species | Taxom |
| Lasiosynidae Kirejtshuk, ..., 2010 | | 22 | Species | Taxom |
| Latridiidae Erichson, 1842 | Minute brown scavenger beetle | 12 | Species | Taxom |
| Lauxaniidae Macquart, 1835 | Beach flies | 99 | Species | Taxom |
| Lecithoceridae Le Marchand, 1947 | Long-horned moths | 107 | Species | Taxom |
| Leiodidae Fleming, 1821 | Round fungus beetles | 392 | Species | Taxom |
| Lemoniidae Hampson, 1918 | Autumn Silkworm Moths | 3 | Species | Taxom |
| Lepidostomatidae Ulmer, 1903 | Bizarre Caddisflies | 73 | Species | Taxom |
| Leptoceridae Leach, 1815 | Long Horned caddisflies | 202 | Species | Taxom |
| Leptopsyllidae Rothschild &..., 1915 | Bird fleas | 75 | Species | Taxom |
| Leucospidae Fabricius, 1775 | Leucospid wasps | 9 | Species | Taxom |
| Liadytidae Ponomarenko, 1977 | | 1 | Species | Taxom |
| Limacodidae Duponchel, 1845 | Cup moths | 58 | Species | Taxom |
| Limnephilidae Kolenati, 1848 | Northern caddisflies | 198 | Species | Taxom |
| Limnetidae Hong, 1983 | | 1 | Species | Taxom |
| Limnichidae Erichson, 1846 | Minute marsh loving beetle | 17 | Species | Taxom |
| Limnocentropodidae Tsuda, 1942 | | 2 | Species | Taxom |
| Limoniidae (Speiser, 1909) | Craneflies | 92 | Species | Taxom |
| Liopteridae Ashmead, 1895 | Liopterid wasps | 13 | Species | Taxom |
| Lithoscarabaeidae Nikolajev, 1992 | | 2 | Species | Taxom |
| Lonchaeidae Loew, 1861 | Lance Flies | 7 | Species | Taxom |
| Lonchopteridae Curtis, 1839 | Pointed-wing flies | 12 | Species | Taxom |
| Luanpingitidae Zhang, 1986 | | 1 | Species | Taxom |
| Lucanidae Latreille, 1804 | Stag Beetle | 570 | Species | Taxom |
| Lutrochidae Kasap & Crowson, 1975 | Robust marsh loving beetle | 1 | Species | Taxom |
| Lycaenidae Leach, 1815 | And blues | 817 | Species | Taxom |
| Lycidae Laporte, 1836 | Lycid beetles | 75 | Species | Taxom |
| Lymexylidae Fleming, 1821 | Ship-timber beetle | 4 | Species | Taxom |
| Lyonetiidae Stainton, 1854 | Lyonet Moths | 9 | Species | Taxom |
| Lypusidae Herrich-Schä..., 1857 | European bagworm moths | 1 | Species | Taxom |
| Magnocoleidae Hong, 1998 | | 1 | Species | Taxom |
| Megachilidae Schenk, 1860 | And Resin Bees | 156 | Species | Taxom |
| Megalodontesidae Konow, 1897 | | 12 | Species | Taxom |
| Megalopodidae Latreille, 1802 | Megalopodid Leaf Beetles | 28 | Species | Taxom |
| Megalyridae Schletterer, 1889 | Megalyrid wasps | 5 | Species | Taxom |
| Megamerinidae Hendel, 1913 | Megamerinid flies | 6 | Species | Taxom |
| Melandryidae Leach, 1815 | False Darkling Beetle | 36 | Species | Taxom |
| Melittidae Schenk, 1860 | Melittid bees | 7 | Species | Taxom |
| Meloidae Gyllenhal, 1810 | Blister Beetle | 101 | Species | Taxom |
| Melolonthidae (Leach, 1817) | Chafers | 24 | Species | Taxom |
| Melyridae Leach, 1815 | Malachite Beetles | 75 | Species | Taxom |
| Mengenillidae Kinzelbach, 1970 | | 1 | Species | Taxom |
| Meropeidae Espen-Petersen, 1921 | Earwig-flies | 1 | Species | Taxom |
| Mesokristenseniidae Huang, Nel &..., 2010 | | 7 | Species | Taxom |
| Mesopsychidae Tillyard, 1917 | | 32 | Species | Taxom |
| Mesosciophilidae Rohdendorf, 1946 | | 15 | Species | Taxom |
| Mesoserphidae Kozlov, 1970 | | 8 | Species | Taxom |
| Micronoctuidae Fibiger, 2005 | | 4 | Species | Taxom |
| Micropezidae Illiger, 1798 | Stilt Flies | 12 | Species | Taxom |
| Micropterigidae Herrich-Schä..., 1855 | Mandibulate Archaic Moths | 8 | Species | Taxom |
| Milichiidae Schiner, 1862 | Filth flies | 4 | Species | Taxom |
| Mirinidae (Kozlov, 1985) | | 1 | Species | Taxom |
| Mirolydidae Wang, Rasnit..., 2017 | | 1 | Species | Taxom |
| Molannidae Wallengren, 1891 | Hood Casemaker Caddisflies | 2 | Species | Taxom |
| Monotomidae Laporte, 1840 | Minute Clubbed Beetles | 7 | Species | Taxom |
| Mordellidae Latreille, 1802 | Pintail beetles | 71 | Species | Taxom |
| Muscidae Latreille, 1802 | Face flies | 819 | Species | Taxom |
| Mutillidae André, 1907 | Cow ant | 24 | Species | Taxom |
| Mycetophagidae Leach, 1815 | Hairy fungus beetle | 17 | Species | Taxom |
| Mycetophilidae Newman, 1834 | Fungus Gnat | 413 | Species | Taxom |
| Mycteridae Blanchard, 1845 | Mycterid beetles | 1 | Species | Taxom |
| Mydidae Bezzi, 1903 | Mydas flies | 1 | Species | Taxom |
| Mymaridae Haliday, 1833 | Fairflies | 23 | Species | Taxom |
| Mymarommatidae Debauche, 1948 | False fairy wasp | 2 | Species | Taxom |
| Myrmecolacidae Saunders, 1872 | | 2 | Species | Taxom |
| Mythicomyiidae Melander, 1902 | Micro Bee Flies | 1 | Species | Taxom |
| Nannochoristidae Tillyard, 1917 | | 3 | Species | Taxom |
| Necrotauliidae Handlirsch, 1906 | | 8 | Species | Taxom |
| Nemestrinidae Macquart, 1834 | Tangle-veined flies | 16 | Species | Taxom |
| Nemonychidae Bedel, 1882 | Nemonychid weevils | 10 | Species | Taxom |
| Neopseustidae Hering, 1925 | Archaic Bell Moths | 3 | Species | Taxom |
| Nepticulidae Stainton, 1854 | Leaf miners | 53 | Species | Taxom |
| Ningxiapsychidae Hong & Li, 2004 | | 1 | Species | Taxom |
| Nitidulidae Latreille, 1802 | Nitidules | 76 | Species | Taxom |
| Noctuidae Latreille, 1809 | Armyworms | 1057 | Species | Taxom |
| Nolidae Hampson, 1894 | Hatted Caterpillars | 89 | Species | Taxom |
| Nosodendridae Erichson, 1846 | Nosodendrid beetles | 4 | Species | Taxom |
| Noteridae C. G. Thomson, 1860 | Burrowing water beetle | 2 | Species | Taxom |
| Notodontidae Stephens, 1829 | Bag Shelter Moths | 249 | Species | Taxom |
| Nycteribiidae Samouelle, 1819 | Bat Flies | 2 | Species | Taxom |
| Nymphalidae Rafinesque, 1815 | Admirals | 1294 | Species | Taxom |
| Nymphomyiidae Tokunaga, 1932 | Nymphomyiid crane flies | 1 | Species | Taxom |
| Ochodaeidae Mulsant & Rey, 1870 | Sand-loving scarab beetle | 16 | Species | Taxom |
| Odiniidae Hendel, 1920 | Odiniid flies | 2 | Species | Taxom |
| Odontoceridae Wallengren, 1891 | Mortarjoint Casemaker Caddisflies | 43 | Species | Taxom |
| Oecophoridae Bruand, 1851 | Concealer Moths | 102 | Species | Taxom |
| Oedemeridae Latreille, 1810 | False Blister Beetle | 60 | Species | Taxom |
| Oestridae Leach, 1815 | Bot flies | 15 | Species | Taxom |
| Omethidae LeConte, 1861 | False fireflies | 2 | Species | Taxom |
| Ommatidae Sharp & Muir, 1912 | | 50 | Species | Taxom |
| Opetiidae Rondani, 1856 | Flat-footed flies | 4 | Species | Taxom |
| Opomyzidae (Fallen, 1820) | Opomyzid flies | 6 | Species | Taxom |
| Orientisargidae Zhang, 2012 | | 1 | Species | Taxom |
| Ormyridae Förster, 1856 | Armyrids | 5 | Species | Taxom |
| Orsodacnidae Thomson, 1859 | Orsodacnid Leaf Beetles | 1 | Species | Taxom |
| Orthophlebiidae Handlirsch, 1906 | | 43 | Species | Taxom |
| Orussidae Newman, 1834 | Orussid wasps | 5 | Species | Taxom |
| Ostomatidae Reitter, 1882 | Bark-gnawing beetles | 1 | Species | Taxom |
| Otitidae (Macquart, 1835) | Picture-winged flies | 40 | Species | Taxom |
| Palaephatidae Davis, 1986 | Gondwanaland Moths | 3 | Species | Taxom |
| Pallopteridae Loew, 1862 | Flutter flies | 3 | Species | Taxom |
| Pamphiliidae Cameron, 1890 | Leaf-rolling sawflies | 69 | Species | Taxom |
| Panorpidae Linnaeus, 1758 | Common scorpionflies | 156 | Species | Taxom |
| Papilionidae Latreille, 1802 | Apollos | 283 | Species | Taxom |
| Parachoristidae Tillyard, 1937 | | 4 | Species | Taxom |
| Parandrexidae Kirejtshuk, 1994 | | 3 | Species | Taxom |
| Paraxymyiidae Rohdendorf, 1946 | Paxylommatid wasps | 2 | Species | Taxom |
| Paroryssidae Martynov, 1925 | | 2 | Species | Taxom |
| Passalidae Leach, 1815 | Bess beetle | 20 | Species | Taxom |
| Pediciidae Osten Sacken, 1860 | Hairy-Eyed Crane Flies | 12 | Species | Taxom |
| Pelecinidae Haliday, 1839 | Ancestral And Modern Pelecinid Wasps | 32 | Species | Taxom |
| Perilampidae Latreille, 1809 | Perilampid waps | 5 | Species | Taxom |
| Periscelididae Oldenberg, 1914 | Periscelidid Flies | 1 | Species | Taxom |
| Perissommatidae Colless, 1962 | | 2 | Species | Taxom |
| Permochoristidae Tillyard, 1918 | | 8 | Species | Taxom |
| Permocupedidae Martynov, 1933 | | 1 | Species | Taxom |
| Permosynidae Tillyard, 1924 | | 1 | Species | Taxom |
| Permotanyderidae Riek, 1953 | | 1 | Species | Taxom |
| Phaeomyiidae (Verbeke, 1950) | Marsh flies | 1 | Species | Taxom |
| Phalacridae Leach, 1815 | Shining flower beetles | 5 | Species | Taxom |
| Phengodidae LeConte, 1861 | Glow-worms | 1 | Species | Taxom |
| Philopotamidae Stephens, 1829 | Finger Net caddisflies | 92 | Species | Taxom |
| Phloiophilidae Kiesenwetter, 1863 | | 1 | Species | Taxom |
| Phoridae Curtis, 1833 | Coffin Flies | 80 | Species | Taxom |
| Phryganeidae (Leach, 1815) | Giant casemaker | 24 | Species | Taxom |
| Phryganopsychidae Wiggins, 1959 | | 1 | Species | Taxom |
| Pieridae Duponchel, 1835 | And Sulphurs | 243 | Species | Taxom |
| Pipunculidae Walker, 1834 | Big headed flies | 46 | Species | Taxom |
| Platypezidae Fallen, 1815 | Flat footed flies | 4 | Species | Taxom |
| Platystomatidae Schiner, 1862 | Picture-winged flies | 35 | Species | Taxom |
| Pleciofungivoridae Rohdendorf, 1946 | | 9 | Species | Taxom |
| Pleciomimidae Rodendorf, 1949 | | 7 | Species | Taxom |
| Pleocomidae LeConte, 1861 | Rain beetle | 1 | Species | Taxom |
| Plutellidae Guenée, 1845 | Diamond-back moths | 24 | Species | Taxom |
| Polycentropodidae Ulmer, 1903 | Tube Maker Caddisflies | 71 | Species | Taxom |
| Pompilidae Latreille, 1805 | Pompilid wasps | 106 | Species | Taxom |
| Praeaulacidae Rasnitsyn, 1972 | | 40 | Species | Taxom |
| Praesiricidae Rasnitsyn, 1968 | | 11 | Species | Taxom |
| Prionoceridae Lacaordaire, 1857 | | 5 | Species | Taxom |
| Proctotrupidae Latreille, 1802 | Proctotrupid wasps | 13 | Species | Taxom |
| Prodoxidae Riley, 1881 | Yucca Moths | 1 | Species | Taxom |
| Prostomidae C. G. Thomson, 1859 | Jugular-horned beetle | 2 | Species | Taxom |
| Protapioceridae Ren, 1998 | | 4 | Species | Taxom |
| Protempididae Ussatchov, 1968 | | 2 | Species | Taxom |
| Protendipedidae Rohdendorf, 1962 | | 2 | Species | Taxom |
| Proterhinidae (Fauvel, 1891) | | 2 | Species | Taxom |
| Protobrachyceridae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Protomphralidae Rohdendorf, 1957 | | 2 | Species | Taxom |
| Protopleciidae Rohdendorf, 1946 | | 27 | Species | Taxom |
| Protorhyphidae Handlirsch, 1906 | | 4 | Species | Taxom |
| Psephenidae Lacordaire, 1854 | Water pennies | 20 | Species | Taxom |
| Pseudopolycentropodidae Handlirsch, 1925 | | 4 | Species | Taxom |
| Pseudopulicidae Gao, Shih & Ren, 2012 | | 6 | Species | Taxom |
| Psilidae Macquart, 1835 | Carrot flies | 27 | Species | Taxom |
| Psychidae Boisduval, 1828 | Bagmoths | 36 | Species | Taxom |
| Psychodidae Newman, 1834 | Drain flies | 60 | Species | Taxom |
| Psychomyiidae Walker, 1852 | Net Tube Caddisflies | 26 | Species | Taxom |
| Pterogeniidae Crowson, 1953 | | 1 | Species | Taxom |
| Pterolonchidae Meyrick, 1918 | Lance Wing Moths | 1 | Species | Taxom |
| Pteromalidae Dalman, 1820 | Pteromalid wasps | 250 | Species | Taxom |
| Pterophoridae Zeller, 1841 | Plume Moths | 135 | Species | Taxom |
| Ptiliidae Heer, 1843 | Feather-wing beetles | 10 | Species | Taxom |
| Ptilodactylidae Laporte, 1836 | Ptilodactylid beetles | 13 | Species | Taxom |
| Ptinidae Latreille, 1802 | Death-watch and Spider Beetles | 110 | Species | Taxom |
| Ptychopteridae Osten Sacken, 1862 | Phantom crane flies | 17 | Species | Taxom |
| Pulicidae Billberg, 1820 | Cat fleas | 15 | Species | Taxom |
| Pygiopsyllidae Wagner, 1939 | | 3 | Species | Taxom |
| Pyralidae Latreille, 1802 | Flour Moths | 300 | Species | Taxom |
| Pyrgotidae Schiner, 1868 | Light Flies | 21 | Species | Taxom |
| Pyrochroidae Latreille, 1807 | Cardinal beetles | 8 | Species | Taxom |
| Pythidae Solier, 1834 | Dead log bark beetles | 1 | Species | Taxom |
| Rhagionemestriidae Ussatchov, 1968 | | 2 | Species | Taxom |
| Rhagionempididae Rohdendorf, 1938 | | 2 | Species | Taxom |
| Rhagionidae Latreille, 1802 | Snipe flies | 74 | Species | Taxom |
| Rhiniidae Brauer & Ber..., 1889 | | 0 | Species | Taxom |
| Rhinophoridae Robineau-Des..., 1863 | Woodlouse flies | 4 | Species | Taxom |
| Rhipiceridae Latreille, 1834 | Cedar beetles | 4 | Species | Taxom |
| Rhipiphoridae Gemminger & ..., 1870 | Hump back beetles | 1 | Species | Taxom |
| Rhyacophilidae Stephens, 1836 | Free-living Caddisflies | 30 | Species | Taxom |
| Rhynchitidae Gistel, 1848 | Leaf-rolling weevils | 11 | Species | Taxom |
| Riodinidae Grote, 1895 | Metalmark Butterflies | 55 | Species | Taxom |
| Ripiphoridae Gemminger & ..., 1870 | Rhipiphoridae | 3 | Species | Taxom |
| Roeslerstammiidae Bruand, 1850 | Double-eye moths | 3 | Species | Taxom |
| Ropalomeridae Linder, 1930 | Ropalomerid flies | 0 | Species | Taxom |
| Roproniidae Bradley, 1905 | Roproniid wasps | 5 | Species | Taxom |
| Rutelidae (MacLeay, 1819) | | 8 | Species | Taxom |
| Salpingidae Leach, 1815 | Narrow-waisted bark beetle | 1 | Species | Taxom |
| Sapygidae Latreille, 1810 | Club-horned wasps | 2 | Species | Taxom |
| Sarcophagidae Macquart, 1834 | Flesh flies | 192 | Species | Taxom |
| Saturniidae Boisduval, 1837 | And Giant Silk Moths | 77 | Species | Taxom |
| Satyridae Boisduval, 1833 | Browns | 0 | Species | Taxom |
| Saurophthiridae Ponomarenko, 1986 | | 1 | Species | Taxom |
| Scarabaeidae Latreille, 1802 | Dung beetles | 3244 | Species | Taxom |
| Scathophagidae Robineau-Des..., 1830 | Dung flies | 25 | Species | Taxom |
| Scatopsidae Newman, 1834 | Dung midges | 9 | Species | Taxom |
| Scelionidae Haliday, 1839 | Scelionid wasps | 80 | Species | Taxom |
| Scenopinidae Burmeister, 1835 | Window Flies | 3 | Species | Taxom |
| Schizocoleidae Rohdendorf, 1961 | | 8 | Species | Taxom |
| Schizophoridae Ponomarenko, 1968 | | 13 | Species | Taxom |
| Schizopodidae (LeConte, 1859) | False Jewel Beetles | 1 | Species | Taxom |
| Sciaridae Billberg, 1820 | Black fungus gnats | 30 | Species | Taxom |
| Sciomyzidae Fallen, 1820 | Marsh Flies | 44 | Species | Taxom |
| Scirtidae Fleming, 1821 | Marsh Beetle | 29 | Species | Taxom |
| Scolebythidae Evans, 1963 | Scolebythid wasps | 2 | Species | Taxom |
| Scoliidae Leach, 1815 | Mammoth wasps | 17 | Species | Taxom |
| Scolytidae (Latreille, 1807) | Ambrosia | 1 | Species | Taxom |
| Scraptiidae Mulsant, 1856 | Antlike leaf beetles | 13 | Species | Taxom |
| Scydmaenidae (Leach, 1815) | Ant-like stone beetles | 157 | Species | Taxom |
| Scythrididae Rebel, 1901 | Flower Moths | 6 | Species | Taxom |
| Sepsidae Walker, 1833 | Black scavenger flies | 18 | Species | Taxom |
| Septiventeridae Bai & al., 2013 | | 1 | Species | Taxom |
| Sepulcidae Rasnitsyn, 1968 | | 2 | Species | Taxom |
| Serendipidae Evenhuis, 1994 | | 3 | Species | Taxom |
| Sericostomatidae Stephens, 1836 | Bushtailed Caddisflies | 5 | Species | Taxom |
| Sesiidae Boisduval, 1828 | Clear Wings | 181 | Species | Taxom |
| Signiphoridae Howard, 1894 | Signiphorid waps | 1 | Species | Taxom |
| Silphidae Latreille, 1807 | Burying And Carrion Beetles | 89 | Species | Taxom |
| Silvanidae Kirby, 1837 | Flat bark beetles | 9 | Species | Taxom |
| Simuliidae Newman, 1834 | Black flies | 125 | Species | Taxom |
| Sinisilvanidae (Hong, 2002) | | 1 | Species | Taxom |
| Sinoryssidae Hong, 1983 | | 1 | Species | Taxom |
| Sinosiricidae Hong You-Chong, 1975 | | 1 | Species | Taxom |
| Siricidae Billberg, 1820 | Horntail | 35 | Species | Taxom |
| Spaniidae (Nagatomi, 1982) | | 1 | Species | Taxom |
| Sphaeritidae Schuckard, 1839 | False clown beetle | 6 | Species | Taxom |
| Sphaeroceridae Macquart, 1835 | Dung flies | 10 | Species | Taxom |
| Sphecidae Latreille, 1802 | Digger & Sand wasps | 46 | Species | Taxom |
| Sphingidae Latreille, 1802 | Hawk Moths | 239 | Species | Taxom |
| Staphylinidae Lameere, 1900 | Rove beetles | 6511 | Species | Taxom |
| Stenopsychidae Martynov, 1924 | | 56 | Species | Taxom |
| Stephanidae Leach, 1815 | Crown wasp | 3 | Species | Taxom |
| Stivaliidae Mardon, 1978 | | 5 | Species | Taxom |
| Strashilidae Rasnitsyn, 1992 | | 2 | Species | Taxom |
| Stratiomyidae Latreille, 1802 | Soldier flies | 152 | Species | Taxom |
| Streblidae (Kolenati, 1863) | Bat flies | 3 | Species | Taxom |
| Strongylophthalmyiidae Hennig, 1940 | Strongylophthalmyiid flies | 5 | Species | Taxom |
| Stylopidae Kirby, 1813 | Strepsiptera | 5 | Species | Taxom |
| Synchroidae Lacordaire, 1859 | Synchroa bark beetles | 1 | Species | Taxom |
| Synteliidae Lewis, 1882 | | 4 | Species | Taxom |
| Syrphidae Latreille, 1802 | Drone flies | 465 | Species | Taxom |
| Tabanidae Latreille, 1802 | Breeze flies | 373 | Species | Taxom |
| Tachinidae (Robineau-Des..., 1830) | Bristle Flies | 623 | Species | Taxom |
| Tachiniscidae (Kertesz, 1903) | | 1 | Species | Taxom |
| Taldycupedidae Rohdendorf, 1961 | | 11 | Species | Taxom |
| Tanyderidae Alexander, 1919 | Primitive crane flies | 9 | Species | Taxom |
| Tasimiidae Riek, 1968 | | 1 | Species | Taxom |
| Tenebrionidae Latreille, 1802 | Darkling Beetle | 178 | Species | Taxom |
| Tenthredinidae Latreille, 1804 | Common sawflies | 820 | Species | Taxom |
| Tephritidae Newman, 1834 | Fruit flies | 464 | Species | Taxom |
| Teratomyzidae Hennig, 1969 | Fern Flies | 0 | Species | Taxom |
| Tethinidae (Hendel, 1916) | Tethinid flies | 7 | Species | Taxom |
| Tetracampidae Förster, 1856 | Tetracampid wasps | 2 | Species | Taxom |
| Tetratomidae Billberg, 1820 | Polypore fungus beetle | 12 | Species | Taxom |
| Thanerocleridae Chapin, 1921 | | 1 | Species | Taxom |
| Thaumaleidae Bezzi, 1913 | Solitary midges | 1 | Species | Taxom |
| Therevidae Newman, 1834 | Stiletto flies | 21 | Species | Taxom |
| Throscidae Laporte, 1840 | False metallic wood-boring beetles | 13 | Species | Taxom |
| Thynnidae Shuckard, 1841 | Thynnid Wasps | 1 | Species | Taxom |
| Thyrididae Herrich-Schä..., 1846 | Picture Winged Leaf Moths | 10 | Species | Taxom |
| Tineidae Latreille, 1810 | & Allies | 81 | Species | Taxom |
| Tiphiidae Leach, 1815 | Flower wasps | 29 | Species | Taxom |
| Tipulidae Latreille, 1802 | Crane Flies | 1441 | Species | Taxom |
| Tischeriidae Spuler, 1898 | Lyonetiid moths | 3 | Species | Taxom |
| Tortricidae Latreille, 1803 | Bell Moths | 883 | Species | Taxom |
| Torymidae Walker, 1833 | Apple seed chalcids | 32 | Species | Taxom |
| Trachypachidae C. G. Thomson, 1857 | False ground beetle | 24 | Species | Taxom |
| Triaplidae Ponomarenko, 1977 | Extinct family | 1 | Species | Taxom |
| Trichoceridae Rondani, 1841 | Winter Crane Flies | 23 | Species | Taxom |
| Trichogrammatidae Haliday, 1851 | Trichogrammatid wasps | 108 | Species | Taxom |
| Tricoleidae (Ponomarenko, 1969) | | 4 | Species | Taxom |
| Trictenotomidae Blanchard, 1845 | Croc beetles | 8 | Species | Taxom |
| Trigonalidae (Cresson, 1887) | Trigonalid sawflies | 1 | Species | Taxom |
| Tritarsidae Hong, 2002 | | 1 | Species | Taxom |
| Trogidae (MacLeay, 1819) | Gnawer beetles | 49 | Species | Taxom |
| Trogossitidae Latreille, 1802 | Bark gnawing beetle | 22 | Species | Taxom |
| Tshekardocoleidae Rohdendorf, 1944 | | 1 | Species | Taxom |
| Ulidiidae Macquart, 1835 | Picture-winged Flies | 6 | Species | Taxom |
| Uraniidae Blanchard, 1845 | Swallowtail Moths | 31 | Species | Taxom |
| Uranorhagionidae Zhang, Yang ..., 2010 | | 5 | Species | Taxom |
| Vermileonidae Williston, 1886 | Wormlion | 9 | Species | Taxom |
| Vermipsyllidae Wagner, 1889 | Carnivore fleas | 22 | Species | Taxom |
| Vesperidae Mulsant, 1839 | Vesperid longicorn beetles | 18 | Species | Taxom |
| Vespidae Leach, 1815 | And Allies | 219 | Species | Taxom |
| Vitimotauliidae Sukatsheva, 1968 | | 7 | Species | Taxom |
| Volitorididae Hong, 1982 | | 1 | Species | Taxom |
| Xenidae Pohl & Beutel, 2005 | | 3 | Species | Taxom |
| Xiphocentronidae Schmid, 1982 | | 1 | Species | Taxom |
| Xiphydriidae Leach, 1819 | Wood wasps | 14 | Species | Taxom |
| Xyelidae Newman, 1835 | Sawfly | 45 | Species | Taxom |
| Xyelotomidae Rasnitsyn, 1968 | | 8 | Species | Taxom |
| Xyelydidae Rasnitsyn, 1968 | | 20 | Species | Taxom |
| Xylomyidae Verrall, 1901 | Wood soldier flies | 32 | Species | Taxom |
| Xylophagidae Fallen, 1810 | Awl-flies | 18 | Species | Taxom |
| Xyloryctidae Meyrick, 1890 | Flower Moths | 10 | Species | Taxom |
| Yponomeutidae Stephens, 1829 | Ermine Moths | 120 | Species | Taxom |
| Ypsolophidae Guenée, 1845 | Ypsolophid Moths | 20 | Species | Taxom |
| Zhangsolvidae Nagatomi & Yang, 1998 | | 1 | Species | Taxom |
| Zopheridae Solier, 1834 | Cylindrical bark beetles | 20 | Species | Taxom |
| Zygaenidae Latreille, 1809 | Burnet Forester | 95 | Species | Taxom |
