| Acanthocnemidae Crowson, 1964 | | 4 | Species | Taxom |
| Acanthopteroctetidae Davis, 1978 | Archaic Sun Moths | 3 | Species | Taxom |
| Acartophthalmidae Czerny, 1928 | Acartophthalmid flies | 7 | Species | Taxom |
| Acroceridae Leach, 1815 | Hunch-back flies | 156 | Species | Taxom |
| Adelidae Bruand, 1851 | Adelid Moths | 202 | Species | Taxom |
| Ademosynidae Ponomarenko, 1968 | | 36 | Species | Taxom |
| Aderidae Winkler, 1927 | Ant-like leaf beetles | 263 | Species | Taxom |
| Agaonidae Walker, 1848 | Fig wasp | 286 | Species | Taxom |
| Agromyzidae Fallen, 1823 | Leaf miner flies | 2878 | Species | Taxom |
| Agyrtidae Thomson, 1859 | Primitive carrion beetles | 67 | Species | Taxom |
| Aididae Schaus, 1906 | | 1 | Species | Taxom |
| Alavarommatidae Ortega-Blanc..., 2011 | | 1 | Species | Taxom |
| Alloioscarabaeidae Bai & al., 2012 | | 1 | Species | Taxom |
| Alucitidae Leach, 1815 | Many Plumed Moths | 113 | Species | Taxom |
| Amphizoidae LeConte, 1853 | Stout-stream beetles | 4 | Species | Taxom |
| Ampulicidae Shuckard, 1840 | Ampulicid wasps | 155 | Species | Taxom |
| Anaxyelidae Martynov, 1925 | Anaxyelids | 43 | Species | Taxom |
| Ancistropsyllidae Toumanoff & ..., 1947 | | 3 | Species | Taxom |
| Andrenidae Webster, 1913 | Andrenid bees | 1414 | Species | Taxom |
| Aneuretopsychidae Rasnitsyn & ..., 1990 | | 7 | Species | Taxom |
| Angarosphecidae Rasnitsyn, 1975 | | 8 | Species | Taxom |
| Anisopodidae Knab, 1912 | Window Midges | 128 | Species | Taxom |
| Anomalopsychidae Flint, 1981 | | 8 | Species | Taxom |
| Anomopterellidae (Rasnitsyn, 1975) | | 2 | Species | Taxom |
| Ansorgiidae Krzeminski &..., 1993 | | 1 | Species | Taxom |
| Antefungivoridae Rohdendorf, 1938 | | 29 | Species | Taxom |
| Anthelidae Turner, 1904 | Australian Lappet Moths | 16 | Species | Taxom |
| Anthicidae Latreille, 1819 | Ant beetles | 880 | Species | Taxom |
| Anthomyiidae Robineau-Des..., 1830 | Anthomyiid flies | 1830 | Species | Taxom |
| Anthomyzidae Czerny, 1903 | Anthomyzid flies | 223 | Species | Taxom |
| Anthophoridae (C. L. Koch, 1846) | | 5 | Species | Taxom |
| Anthribidae Billberg, 1820 | Fungus Weevil | 1680 | Species | Taxom |
| Apataniidae Wallengren, 1886 | Early Smoky Wing Sedges | 236 | Species | Taxom |
| Apatelodidae Neumoegen & ..., 1894 | American Silkworm Moths | 2 | Species | Taxom |
| Aphelinidae Thomson, 1876 | Aphelinid wasps | 729 | Species | Taxom |
| Aphodiidae Leach, 1815 | | 19 | Species | Taxom |
| Apidae Latreille, 1802 | Bumble bees | 2780 | Species | Taxom |
| Apioceridae Bigot, 1852 | Flower-loving flies | 16 | Species | Taxom |
| Apsilocephalidae Nagatomi & al., 1991 | | 4 | Species | Taxom |
| Aptenoperissidae Rasnitsyn & ..., 2016 | | 1 | Species | Taxom |
| Archaemiopteridae Guthorl, 1939 | | 1 | Species | Taxom |
| Archaeocynipidae Rasnitsyn & ..., 1988 | | 3 | Species | Taxom |
| Archaeolepidae (Whalley, 1985) | | 1 | Species | Taxom |
| Archaeoserphitidae Engel, 2015 | | 1 | Species | Taxom |
| Archeocrypticidae Kaszab, 1964 | Ancient Fungus Beetles | 16 | Species | Taxom |
| Archisargidae Rohdendorf, 1962 | | 41 | Species | Taxom |
| Archisialidae Martynov, 1933 | | 1 | Species | Taxom |
| Archizelmiridae Rohdendorf, 1962 | | 5 | Species | Taxom |
| Arctiidae Leach, 1815 | Footman moths | 143 | Species | Taxom |
| Argidae Konow, 1890 | Argid flies | 167 | Species | Taxom |
| Artematopodidae Lacordaire, 1857 | Soft bodied plant beetle | 18 | Species | Taxom |
| Artiidae | | 0 | Species | Taxom |
| Ascololepidopterigidae Zhang & al., 2013 | | 3 | Species | Taxom |
| Asilidae Latreille, 1802 | Assassin flies | 3767 | Species | Taxom |
| Asiochaoboridae Hong & Wang, 1990 | | 4 | Species | Taxom |
| Asiocoleidae Rohdendorf, 1961 | | 4 | Species | Taxom |
| Aspidytidae Ribera, Beu..., 2002 | Cliff water beetles | 2 | Species | Taxom |
| Asteiidae Rondani, 1856 | Asteiid Flies | 55 | Species | Taxom |
| Atelestidae Hennig, 1970 | | 17 | Species | Taxom |
| Athericidae Stuckenberg, 1973 | Athericid flies | 82 | Species | Taxom |
| Attelabidae Billberg, 1820 | Leaf Rolling Weevil | 3150 | Species | Taxom |
| Aulacidae Shuckard, 1842 | Aulacid wasps | 103 | Species | Taxom |
| Aulacigastridae Wollaston, 1864 | Aulacigastrid flies | 21 | Species | Taxom |
| Austroniidae Kozlov, 1975 | Austroniid wasps | 1 | Species | Taxom |
| Autostichidae Le Marchand, 1947 | Autostichid Moths | 325 | Species | Taxom |
| Axymyiidae Rohdendorf, 1946 | Axymyiidae flies | 16 | Species | Taxom |
| Baissidae Rasnitsyn, 1975 | | 2 | Species | Taxom |
| Baissodidae Benton, 1993 | | 8 | Species | Taxom |
| Baissoferidae Sukatsheva, 1968 | | 5 | Species | Taxom |
| Batrachedridae Heinemann & ..., 1876 | Batrachedrid Moths | 57 | Species | Taxom |
| Bedelliidae (Stainton, 1849) | | 1 | Species | Taxom |
| Belidae Schönherr, 1826 | Belid Beetle | 55 | Species | Taxom |
| Belmontiidae Tillyard, 1919 | | 0 | Species | Taxom |
| Beraeidae Wallengren, 1891 | Small eastern caddisflies | 62 | Species | Taxom |
| Berendtimiridae Winkler, 1987 | | 1 | Species | Taxom |
| Bethylidae Halliday, 1839 | Bethylid wasps | 507 | Species | Taxom |
| Bethylonymidae Rasnitsyn, 1975 | | 23 | Species | Taxom |
| Bibionidae Fleming, 1821 | Bibionid flies | 803 | Species | Taxom |
| Biphyllidae LeConte, 1861 | Biphyllid beetles | 49 | Species | Taxom |
| Bittacidae Handlirsch, 1906 | Hanging scorpionflies | 197 | Species | Taxom |
| Blasticotomidae Thomson, 1871 | Blasticotomid sawflies | 5 | Species | Taxom |
| Blastobasidae (Meyrick, 1894) | Blastobasid moths | 0 | Species | Taxom |
| Blattocoleidae Zeuner, 1933 | | 3 | Species | Taxom |
| Blephariceridae Loew, 1861 | Mountain midges | 160 | Species | Taxom |
| Boholdoyidae Kovalev, 1985 | | 3 | Species | Taxom |
| Bolboceratidae (Mulsant, 1842) | Dor beetle | 2 | Species | Taxom |
| Boleopsidae Kirejtshuk &..., 2013 | | 1 | Species | Taxom |
| Bolitophilidae Malloch, 1917 | | 8 | Species | Taxom |
| Bombycidae Latreille, 1802 | Lappet moths | 158 | Species | Taxom |
| Bombyliidae Latreille, 1802 | Bee Flies | 2078 | Species | Taxom |
| Boreidae Latreille, 1816 | Snow fleas | 25 | Species | Taxom |
| Boridae C. G. Thomson, 1859 | Borids | 5 | Species | Taxom |
| Bostrichidae Latreille, 1802 | Auger beetles | 345 | Species | Taxom |
| Bothrideridae Erichson, 1845 | Cocoon-forming beetles | 65 | Species | Taxom |
| Brachodidae Agenjo, 1966 | Little Bear Moths | 94 | Species | Taxom |
| Brachycentridae Ulmer, 1903 | Humpless Casemaker Caddisflies | 33 | Species | Taxom |
| Brachyceridae (Billberg, 1820) | Brachycerids | 31 | Species | Taxom |
| Brachyceritidae Hong, 2002 | | 1 | Species | Taxom |
| Brachycleistogastridae (Kovalev, 1994) | | 4 | Species | Taxom |
| Brachypsectridae LeConte & Horn, 1883 | Texas beetle | 2 | Species | Taxom |
| Brachypteridae (Erichson, 1845) | Short-winged Flower Beetles | 71 | Species | Taxom |
| Brachystomatidae Melander, 1908 | | 11 | Species | Taxom |
| Braconidae Latreille, 1829 | Braconid wasps | 8602 | Species | Taxom |
| Bradynobaenidae Saussure, 1892 | Bradynobaenid wasps | 11 | Species | Taxom |
| Brahmaeidae Swinhoe, 1892 | Brahmin Moths | 26 | Species | Taxom |
| Brassolidae (Boisduval, 1836) | | 1 | Species | Taxom |
| Braulidae Egger, 1853 | Bee lice | 7 | Species | Taxom |
| Brentidae Billberg, 1820 | Brenthidae | 1635 | Species | Taxom |
| Buprestidae Leach, 1815 | Flat-headed wood-borers | 2909 | Species | Taxom |
| Byrrhidae Latreille, 1804 | Moss beetles | 353 | Species | Taxom |
| Byturidae Jacquelin du..., 1858 | Fruit worms | 23 | Species | Taxom |
| Calamoceratidae Ulmer, 1905 | | 107 | Species | Taxom |
| Callidulidae Moore, 1877 | Old World Butterfly Moths | 37 | Species | Taxom |
| Callipharixenidae Pierce, 1918 | | 1 | Species | Taxom |
| Calliphoridae Brauer & Ber..., 1889 | Blow flies | 1428 | Species | Taxom |
| Callirhipidae Emden, 1924 | Callirhipid beetles | 69 | Species | Taxom |
| Calocidae Ross, 1967 | | 2 | Species | Taxom |
| Camillidae Frey, 1921 | Camillid flies | 21 | Species | Taxom |
| Canaceidae (Jones, 1906) | Beach flies | 54 | Species | Taxom |
| Canacidae Jones, 1906 | Beach Flies | 6 | Species | Taxom |
| Cantharidae Imhoff, 1856 | Cantharids | 2367 | Species | Taxom |
| Canthyloscelidae Enderlein, 1912 | | 9 | Species | Taxom |
| Carabaidae | | 1 | Species | Taxom |
| Carabidae Latreille, 1802 | Carabid beetles | 24809 | Species | Taxom |
| Caridae Thompson, 1992 | | 35 | Species | Taxom |
| Carnidae Newman, 1834 | Bird flies | 94 | Species | Taxom |
| Carposinidae Walsingham, 1907 | Carposinid moths | 127 | Species | Taxom |
| Castniidae Boisduval, 1828 | Castniid moths | 14 | Species | Taxom |
| Cecidomyiidae Newman, 1834 | Cecidomyidae | 5262 | Species | Taxom |
| Cecidosidae Brèthes, 1916 | Gall Moths | 1 | Species | Taxom |
| Celyphidae Bigot, 1852 | Beetle flies | 99 | Species | Taxom |
| Cephidae Newman, 1834 | Cephids | 95 | Species | Taxom |
| Cerambycidae Latreille, 1802 | Long Horn beetles | 17777 | Species | Taxom |
| Ceraphronidae Haliday, 1833 | Ceraphronid wasps | 127 | Species | Taxom |
| Ceratophyllidae Dampf, 1908 | Bird Fleas | 311 | Species | Taxom |
| Ceratopogonidae Newman, 1834 | Biting midge | 3455 | Species | Taxom |
| Cerophytidae Latreille, 1834 | Cerophytid beetles | 9 | Species | Taxom |
| Cerylonidae Billberg, 1820 | Cerylid Kingfishers | 137 | Species | Taxom |
| Cetoniidae (Leach, 1815) | Flower beetles | 4 | Species | Taxom |
| Chalcididae Latreille, 1817 | Chalcidid wasps | 751 | Species | Taxom |
| Chamaemyiidae Hendel, 1910 | Aphid flies | 240 | Species | Taxom |
| Chaoboridae Newman, 1834 | Phantom midge | 117 | Species | Taxom |
| Charipidae | | 0 | Species | Taxom |
| Chathamiidae Tillyard, 1925 | Marine Caddises | 1 | Species | Taxom |
| Chelonariidae Blanchard, 1845 | Chelonarid beetles | 27 | Species | Taxom |
| Chimabachidae (HEINEMANN, 1870) | Chimabachid Moths | 3 | Species | Taxom |
| Chimaeropsyllidae Ewing & Fox, 1943 | | 1 | Species | Taxom |
| Chimeromyiidae Grimaldi & C..., 2009 | | 8 | Species | Taxom |
| Chironomidae Erichson, 1842 | Chironomids | 7947 | Species | Taxom |
| Chloropidae Schoenherr, 1840 | Chloropid flies | 1772 | Species | Taxom |
| Choreutidae Stainton, 1854 | Choreuitid Moths | 182 | Species | Taxom |
| Choristopsychidae Martynov, 1937 | | 4 | Species | Taxom |
| Chrysididae Latreille, 1802 | Chrysidid wasps | 789 | Species | Taxom |
| Chrysomelidae Latreille, 1802 | Casebearers | 6339 | Species | Taxom |
| Chyromyidae Hendel, 1916 | Chiromyid flies | 107 | Species | Taxom |
| Ciidae Leach, 1819 | Minute tree fungus beetles | 269 | Species | Taxom |
| Cimbicidae Kirby, 1837 | Cimbicid sawflies | 143 | Species | Taxom |
| Cimbrophlebiidae Willmann, 1977 | Hangingfly | 11 | Species | Taxom |
| Cladochoristidae Tillyard, 1926 | | 3 | Species | Taxom |
| Clambidae Fischer, 1821 | Fringe-winged beetles | 78 | Species | Taxom |
| Cleridae Latreille, 1802 | Checkered Beetle | 487 | Species | Taxom |
| Clusiidae Schönherr, 1840 | Clusiid flies | 194 | Species | Taxom |
| Coccinellidae Latreille, 1807 | Coccinelles | 1436 | Species | Taxom |
| Cochylidae | | 3 | Species | Taxom |
| Coelocatiniidae Ponomarenko, 1968 | | 9 | Species | Taxom |
| Coelopidae Hendel, 1910 | Kelp Flies | 10 | Species | Taxom |
| Coleocatiniidae Ponomarenko ..., 2015 | | 1 | Species | Taxom |
| Coleophoridae Hübner, 1825 | Case moths | 1928 | Species | Taxom |
| Coleopsidae Kirejtshuk &..., 2016 | | 1 | Species | Taxom |
| Colletidae Lepeletier, 1841 | Colletid bees | 563 | Species | Taxom |
| Colymbotethidae Ponomarenko, 1993 | | 2 | Species | Taxom |
| Conoesucidae Ross, 1967 | | 7 | Species | Taxom |
| Conopidae Latreille, 1802 | Thick-headed Flies | 403 | Species | Taxom |
| Copromorphidae Meyrick, 1905 | Fig Borers | 15 | Species | Taxom |
| Coptoclavidae Ponomarenko, 1961 | Extinct family | 51 | Species | Taxom |
| Coptopsyllidae Wagner, 1928 | | 18 | Species | Taxom |
| Corioxenidae Kinzelbach, 1970 | | 22 | Species | Taxom |
| Corylophidae LeConte, 1852 | Hooded beetles | 102 | Species | Taxom |
| Cosmopterigidae Heinemann & ..., 1876 | Cosmet Moths | 674 | Species | Taxom |
| Cossidae Leach, 1815 | Borers | 816 | Species | Taxom |
| Crabronidae Latreille, 1802 | Bee Wolves | 4043 | Species | Taxom |
| Crambidae Latreille, 1810 | Crambid Snout Moths | 5296 | Species | Taxom |
| Cretohisteridae | | 1 | Species | Taxom |
| Cretostylopidae Grimalid & K..., 2005 | | 1 | Species | Taxom |
| Crowsoniellidae Iablokoff-Kh..., 1983 | Crowsoniella relicta | 1 | Species | Taxom |
| Cryptochetidae Brues & Mela..., 1932 | Cryptochetid Flies | 19 | Species | Taxom |
| Cryptophagidae Kirby, 1937 | Mould beetles | 446 | Species | Taxom |
| Ctenophthalmidae Rothschild, 1915 | | 356 | Species | Taxom |
| Ctenuchidae (W. Kirby, 1837) | Ctenuchid moths | 8 | Species | Taxom |
| Cucujidae Latreille, 1802 | Flat bark beetles | 255 | Species | Taxom |
| Culicidae Meigen, 1818 | Mosquito | 2329 | Species | Taxom |
| Cupedidae Laporte, 1836 | Cupedids | 182 | Species | Taxom |
| Curculionidae Latreille, 1802 | Ambrosia beetles | 23327 | Species | Taxom |
| Curtonotidae Duda, 1934 | Curtonotid flies | 21 | Species | Taxom |
| Cycloristidae Martynova, 1958 | | 2 | Species | Taxom |
| Cylindrotomidae (Mulsant, 1842) | Cylindrotomid Crane Flies | 20 | Species | Taxom |
| Cynipidae Latreille, 1802 | Cynipid gall wasps | 748 | Species | Taxom |
| Cypselosomatidae Hennig, 1958 | Cypselosomatid flies | 13 | Species | Taxom |
| Cypselostomatidae | | 1 | Species | Taxom |
| Dalceridae Dyar, 1898 | Dalcerid moths | 1 | Species | Taxom |
| Danaidae (Boisduval, 1833) | Milkweed Butterflies | 44 | Species | Taxom |
| Daohugoidae Rasnitsyn & ..., 2004 | | 1 | Species | Taxom |
| Dascillidae Guérin-Ménev..., 1843 | Orchid beetles | 76 | Species | Taxom |
| Decliniidae Nikitsky, La..., 1994 | Declinia relicta | 2 | Species | Taxom |
| Depressariidae Meyrick, 1883 | Flat-Bodied Moths | 1 | Species | Taxom |
| Dermestidae Hope, 1840 | Carpet beetles | 707 | Species | Taxom |
| Derodontidae LeConte, 1861 | Tooth-neck fungus beetles | 36 | Species | Taxom |
| Deuterophlebiidae Edwards, 1922 | Mountain midges | 8 | Species | Taxom |
| Diadocidiidae Winnertz, 1863 | | 3 | Species | Taxom |
| Diapriidae Latreille, 1796 | Diapriid wasps | 933 | Species | Taxom |
| Diastatidae Hendel, 1917 | Bog flies | 42 | Species | Taxom |
| Dictyodipteridae Rohdendorf, 1961 | | 1 | Species | Taxom |
| Dinopanorpidae Carpenter, 1972 | | 2 | Species | Taxom |
| Diopsidae Billberg, 1820 | Stalk-eyed flies | 63 | Species | Taxom |
| Diprionidae Rohwer, 1911 | Conifer sawflies | 51 | Species | Taxom |
| Dipseudopsidae Ulmer, 1904 | | 75 | Species | Taxom |
| Discolomatidae Horn, 1878 | | 114 | Species | Taxom |
| Ditomyiidae Keilin, 1919 | | 6 | Species | Taxom |
| Dixidae Schiner, 1868 | Dixid Midges | 156 | Species | Taxom |
| Dolichopodidae Latreille, 1809 | Long legged flies | 3975 | Species | Taxom |
| Douglasiidae Heinemann & ..., 1876 | Douglas Moths | 35 | Species | Taxom |
| Drepanidae Meyrick, 1895 | Drepanids | 513 | Species | Taxom |
| Drilidae (Blanchard, 1845) | Drilid beetles | 3 | Species | Taxom |
| Drosophilidae Rondani, 1856 | Fruit flies | 2066 | Species | Taxom |
| Dryinidae Haliday, 1840 | Dryinid wasps | 352 | Species | Taxom |
| Dryomyzidae Schiner, 1862 | Dryomyzid flies | 50 | Species | Taxom |
| Dryophthoridae (Schönherr, 1825) | Palm weevils | 9 | Species | Taxom |
| Dryopidae Billberg, 1820 | Long toed water beetle | 127 | Species | Taxom |
| Dudgeoneidae Berger, 1958 | Dudgeon Carpenterworm Moths | 1 | Species | Taxom |
| Dysoneuridae Sukatsheva, 1968 | | 6 | Species | Taxom |
| Dytiscidae Leach, 1815 | Diving beetles | 2093 | Species | Taxom |
| Ecnomidae Ulmer, 1903 | | 212 | Species | Taxom |
| Elachistidae Bruand, 1851 | Elachistid moths | 1280 | Species | Taxom |
| Elateridae Leach, 1815 | Click Beetle | 6644 | Species | Taxom |
| Electrotomidae Rasnitsyn, 1977 | | 1 | Species | Taxom |
| Elenchidae Perkins, 1905 | | 9 | Species | Taxom |
| Elliidae Krzeminska, ..., 1993 | | 4 | Species | Taxom |
| Elmidae Curtis, 1830 | Drive beetles | 715 | Species | Taxom |
| Elodophthalmidae Kirejtshuk &..., 2008 | | 2 | Species | Taxom |
| Embolemidae Förster, 1856 | Embolemid wasps | 16 | Species | Taxom |
| Empididae Latreille, 1809 | Balloon flies | 2138 | Species | Taxom |
| Encyrtidae Walker, 1837 | Encyrtid wasps | 2175 | Species | Taxom |
| Endomychidae Leach, 1815 | False Ladybirds | 728 | Species | Taxom |
| Endromidae Boisduval, 1828 | Glory Moths | 1 | Species | Taxom |
| Englathaumatidae Novokshonov ..., 2016 | | 2 | Species | Taxom |
| Eoditomyiidae Ansorge, 1996 | | 1 | Species | Taxom |
| Eoichneumonidae (Jell & Duncan, 1986) | | 15 | Species | Taxom |
| Eolepidopterigidae Rasnitsyn, 1983 | | 12 | Species | Taxom |
| Eomeropidae Cockerell, 1909 | | 10 | Species | Taxom |
| Eomyiidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Eopolyneuridae Rohdendorf, 1962 | | 2 | Species | Taxom |
| Eostephanitidae Hong, 2002 | | 1 | Species | Taxom |
| Eostratiomyiidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Epermeniidae Spuler, 1910 | Epermeniid moths | 164 | Species | Taxom |
| Ephialtitidae Handlirsch, 1906 | | 78 | Species | Taxom |
| Ephydridae Zetterstedt, 1837 | Brine flies | 1157 | Species | Taxom |
| Epicopeiidae Swinhoe, 1892 | Oriental Swallowtail Moths | 9 | Species | Taxom |
| Epipyropidae Dyar, 1903 | Planthopper Parasite Moths | 14 | Species | Taxom |
| Erebidae Leach, 1815 | Erebid Moths | 8057 | Species | Taxom |
| Eremazidae Iablokoff-Kh..., 1977 | | 3 | Species | Taxom |
| Eremochaetidae Ussatchov, 1968 | | 23 | Species | Taxom |
| Eriocottidae Spuler, 1898 | Old World Spiny Winged Moths | 48 | Species | Taxom |
| Eriocraniidae Rebel, 1901 | Eriocraniid moths | 42 | Species | Taxom |
| Erotylidae Latreille, 1802 | Pleasing Fungus Beetle | 290 | Species | Taxom |
| Ethmiidae (Busck, 1909) | Black-spotted Moths | 1 | Species | Taxom |
| Eucharitidae Latreille, 1809 | Eucharitid wasp | 116 | Species | Taxom |
| Eucinetidae Lacordaire, 1857 | Plate-thigh beetle | 38 | Species | Taxom |
| Eucnemidae Eschscholtz, 1829 | Click Beetles | 150 | Species | Taxom |
| Eucoilidae (Thomson, 1862) | | 9 | Species | Taxom |
| Eulichadidae Crowson, 1973 | Forest stream beetle | 32 | Species | Taxom |
| Eulophidae Westwood, 1829 | Eulophid wasps | 2474 | Species | Taxom |
| Eupelmidae Walker, 1833 | Eupelmid wasps | 311 | Species | Taxom |
| Eupterotidae Swinhoe, 1892 | Giant Lappet Moths | 115 | Species | Taxom |
| Eurytomidae Walker, 1832 | Eurytomid wasps | 793 | Species | Taxom |
| Euteliidae Grote, 1882 | Euteliid Moths | 176 | Species | Taxom |
| Evaniidae Latreille, 1802 | Ensign wasp | 197 | Species | Taxom |
| Expansicornidae Hong, 2002 | | 1 | Species | Taxom |
| Falsiformicidae Rasnitsyn, 1975 | | 2 | Species | Taxom |
| Fanniidae Schnabl & Dz..., 1911 | Latrine flies | 248 | Species | Taxom |
| Fergusoninidae Hennig, 1958 | | 3 | Species | Taxom |
| Figitidae Thomson, 1862 | Figitid wasps | 655 | Species | Taxom |
| Formicidae Latreille, 1809 | Ant | 8392 | Species | Taxom |
| Fungivoritidae Rohdendorf, 1957 | | 13 | Species | Taxom |
| Galacticidae Minet, 1986 | Galacticid Moths | 9 | Species | Taxom |
| Gasteruptiidae Ashmead, 1900 | Carrot Wasps | 74 | Species | Taxom |
| Gelechiidae Stainton, 1854 | Gelechiid moths | 3284 | Species | Taxom |
| Geometridae Leach, 1815 | Cankerworm moths | 10649 | Species | Taxom |
| Georyssidae Laporte, 1819 | Minute mud-loving beetles | 1 | Species | Taxom |
| Geotrupidae Latreille, 1802 | Dor beetles | 775 | Species | Taxom |
| Gerocynipidae Kovalev, 1994 | | 5 | Species | Taxom |
| Gigasiricidae (Rasnitsyn, 1968) | | 1 | Species | Taxom |
| Glaphyridae MacLeay, 1819 | Bumble bee scarab beetle | 210 | Species | Taxom |
| Glaphyropteridae Pongracz, 1935 | | 23 | Species | Taxom |
| Glaresidae Kolbe, 1905 | Enigmatic scarab beetle | 27 | Species | Taxom |
| Glossinidae Theobald, 1903 | Tik-tik flies | 8 | Species | Taxom |
| Glossopteridae Sharov, 1966 | | 1 | Species | Taxom |
| Glossosomatidae Wallengren, 1891 | Little Black Caddisflies | 358 | Species | Taxom |
| Glyphipterigidae Stainton, 1854 | Glyphipterigid moths | 198 | Species | Taxom |
| Gnomuscidae Shcherbakov, 1995 | | 2 | Species | Taxom |
| Gobryidae Mcalpine, 1997 | | 5 | Species | Taxom |
| Goeridae Ulmer, 1903 | | 184 | Species | Taxom |
| Gracillariidae Stainton, 1854 | Blotch leaf miner moths | 1454 | Species | Taxom |
| Grauvogeliidae Krzeminski, 1994 | | 6 | Species | Taxom |
| Gyrinidae Latreille, 1802 | Whirligig beetle | 241 | Species | Taxom |
| Halictidae Thomson, 1869 | Flower bees | 2220 | Species | Taxom |
| Halictophagidae Perkins, 1905 | | 92 | Species | Taxom |
| Haliplidae Aubé, 1836 | Crawling Water Beetle | 132 | Species | Taxom |
| Helcomyzidae Malloch, 1933 | Helcomyzid flies | 1 | Species | Taxom |
| Heleomyzidae (Westwood, 1840) | Heleomyzid flies | 480 | Species | Taxom |
| Heliconiidae (Swainson, 1822) | Heliconians | 4 | Species | Taxom |
| Helicophidae Mosely, 1953 | | 1 | Species | Taxom |
| Helicopsychidae Ulmer, 1912 | Snail Case caddisflies | 119 | Species | Taxom |
| Heliodinidae Heinemann & ..., 1876 | Heliodinid moths | 18 | Species | Taxom |
| Heliozelidae Heinemann & ..., 1876 | Leaf miners | 70 | Species | Taxom |
| Helophoridae (Leach, 1815) | Water scavenger beetles | 1 | Species | Taxom |
| Heloridae Förster, 1856 | Helorid wasps | 25 | Species | Taxom |
| Helosciomyzidae Griffiths, 1972 | | 7 | Species | Taxom |
| Helotidae Reitter, 1876 | | 111 | Species | Taxom |
| Hennigmatidae Shcherbakov, 1995 | | 3 | Species | Taxom |
| Hepialidae Stephens, 1829 | Ghost Moths | 343 | Species | Taxom |
| Hesperiidae Latreille, 1809 | Indet. Skipper | 2150 | Species | Taxom |
| Hesperinidae Hendel, 1928 | | 10 | Species | Taxom |
| Heteroceridae MacLeay, 1825 | Mud beetles | 200 | Species | Taxom |
| Heterocheilidae Mcalpine, 1991 | Half-bridge flies | 3 | Species | Taxom |
| Heterogynidae Rambur, 1866 | Mediterranean Burnet Moths | 8 | Species | Taxom |
| Heteromyzidae Fallen, 1820 | Heleomyzid flies | 4 | Species | Taxom |
| Hilarimorphidae Hendel, 1936 | Hilarimorphid flies | 11 | Species | Taxom |
| Himantopteridae Rogenhofer, 1884 | Long Tailed Burnet Moths | 8 | Species | Taxom |
| Hippoboscidae Samouelle, 1819 | Keds | 390 | Species | Taxom |
| Histeridae Gyllenhal, 1808 | Clown beetle | 2187 | Species | Taxom |
| Hoffeinsmyiidae Michelsen, 2009 | | 1 | Species | Taxom |
| Holcopogonidae Gozmany, 1967 | | 2 | Species | Taxom |
| Holcorpidae Willmann, 1989 | | 2 | Species | Taxom |
| Homalophlebiidae Handlirsch, 1906 | | 3 | Species | Taxom |
| Huaxiasciaritidae (Hong, 2002) | | 28 | Species | Taxom |
| Hyblaeidae Hampson, 1903 | Teak Moths | 18 | Species | Taxom |
| Hybosoridae Erichson, 1847 | Pill scarab beetles | 239 | Species | Taxom |
| Hybotidae Meigen, 1820 | Dance flies | 1341 | Species | Taxom |
| Hydraenidae Mulsant, 1844 | Cascade Beetles | 1106 | Species | Taxom |
| Hydrobiosidae Ulmer, 1905 | | 546 | Species | Taxom |
| Hydrochidae (Thomson, 1859) | | 1 | Species | Taxom |
| Hydrophilidae Latreille, 1802 | Silver Water Beetles | 2321 | Species | Taxom |
| Hydropsychidae Curtis, 1835 | Net Spinning caddisflies | 885 | Species | Taxom |
| Hydroptilidae Stephens, 1836 | Micro caddisflies | 1918 | Species | Taxom |
| Hydroscaphidae LeConte, 1874 | Skiff beetle | 16 | Species | Taxom |
| Hygrobiidae Régimbart, 1878 | Screech beetles | 4 | Species | Taxom |
| Hyperpolyneuridae Rohdendorf, 1961 | | 1 | Species | Taxom |
| Hystrichopsyllidae Tiraboschi, 1904 | Insectivore fleas | 39 | Species | Taxom |
| Ibaliidae Thomson, 1862 | Ibaliid wasps | 22 | Species | Taxom |
| Ichneumonidae Latreille, 1802 | Ichneumon flies | 10853 | Species | Taxom |
| Ichneumonomimidae Rasnitsyn, 1975 | | 2 | Species | Taxom |
| Ideliidae (Zalessky, 1929) | | 43 | Species | Taxom |
| Immidae Heppner, 1977 | Imma Moths | 74 | Species | Taxom |
| Incurvariidae Spuler, 1898 | Fairy moths | 50 | Species | Taxom |
| Ironomyiidae McAlpine & M..., 1966 | Ironic flies | 22 | Species | Taxom |
| Ischnopsyllidae Wahlgren, 1907 | Bat fleas | 72 | Species | Taxom |
| Ithyceridae (Schönherr, 1826) | New York weevil | 4 | Species | Taxom |
| Jacobsoniidae Heller, 1926 | Jacobson's beetles | 17 | Species | Taxom |
| Jurapriidae Rasnitsyn, 1983 | | 1 | Species | Taxom |
| Jurodidae Ponomarenko, 1985 | Jurodids | 6 | Species | Taxom |
| Kalophryganeidae Haupt, 1956 | | 1 | Species | Taxom |
| Kaltanidae Martynova, 1958 | | 39 | Species | Taxom |
| Karatavitidae Rasnitsyn, 1963 | | 21 | Species | Taxom |
| Kateretidae Kirkby, 1837 | Pollen Beetles | 16 | Species | Taxom |
| Keroplatidae Rondani, 1856 | Fungus gnats | 578 | Species | Taxom |
| Khutelchalcididae Rasnitsyn & al., 2004 | | 2 | Species | Taxom |
| Kinzelbachillidae Pohl & Beutel, 2016 | | 1 | Species | Taxom |
| Kovalevisargidae Mostovski, 1997 | | 6 | Species | Taxom |
| Kuafuidae Rasnitsyn & ..., 2010 | | 1 | Species | Taxom |
| Lacturidae Heppner, 1995 | Australian burnet moths | 18 | Species | Taxom |
| Laemophloeidae (Ganglbauer, 1899) | Lined flat bark beetles | 16 | Species | Taxom |
| Lagriidae (Latreille, 1825) | Lagriid beetles | 1 | Species | Taxom |
| Lampyridae Latreille, 1817 | Fireflies | 1039 | Species | Taxom |
| Languriidae (Latreille, 1802) | Lizard beetles | 1 | Species | Taxom |
| Lasiocampidae Harris, 1841 | Eggar Moths | 529 | Species | Taxom |
| Lasiosynidae Kirejtshuk, ..., 2010 | | 52 | Species | Taxom |
| Latridiidae Erichson, 1842 | Minute brown scavenger beetle | 367 | Species | Taxom |
| Lauxaniidae Macquart, 1835 | Beach flies | 1087 | Species | Taxom |
| Lecithoceridae Le Marchand, 1947 | Long-horned moths | 453 | Species | Taxom |
| Leiodidae Fleming, 1821 | Round fungus beetles | 3378 | Species | Taxom |
| Lemoniidae Hampson, 1918 | Autumn Silkworm Moths | 13 | Species | Taxom |
| Lepiceridae Hinton, 1936 | | 4 | Species | Taxom |
| Lepidostomatidae Ulmer, 1903 | Bizarre Caddisflies | 619 | Species | Taxom |
| Leptidae | | 0 | Species | Taxom |
| Leptoceridae Leach, 1815 | Long Horned caddisflies | 1479 | Species | Taxom |
| Leptopsyllidae Rothschild &..., 1915 | Bird fleas | 172 | Species | Taxom |
| Leucospidae Fabricius, 1775 | Leucospid wasps | 61 | Species | Taxom |
| Liadytidae Ponomarenko, 1977 | | 8 | Species | Taxom |
| Liassophilidae Tillyard, 1933 | | 6 | Species | Taxom |
| Limacodidae Duponchel, 1845 | Cup moths | 514 | Species | Taxom |
| Limnephilidae Kolenati, 1848 | Northern caddisflies | 1018 | Species | Taxom |
| Limnetidae Hong, 1983 | | 1 | Species | Taxom |
| Limnichidae Erichson, 1846 | Minute marsh loving beetle | 178 | Species | Taxom |
| Limnocentropodidae Tsuda, 1942 | | 17 | Species | Taxom |
| Limoniidae (Speiser, 1909) | Craneflies | 974 | Species | Taxom |
| Liopteridae Ashmead, 1895 | Liopterid wasps | 22 | Species | Taxom |
| Lithopanorpidae Carpenter, 1930 | | 1 | Species | Taxom |
| Lithoscarabaeidae Nikolajev, 1992 | | 3 | Species | Taxom |
| Lonchaeidae Loew, 1861 | Lance Flies | 275 | Species | Taxom |
| Lonchopteridae Curtis, 1839 | Pointed-wing flies | 61 | Species | Taxom |
| Lophocoronidae Common, 1973 | Australian Archaic Sun Moths | 1 | Species | Taxom |
| Luanpingitidae Zhang, 1986 | | 1 | Species | Taxom |
| Lucanidae Latreille, 1804 | Stag Beetle | 2112 | Species | Taxom |
| Lutrochidae Kasap & Crowson, 1975 | Robust marsh loving beetle | 2 | Species | Taxom |
| Lycaenidae Leach, 1815 | And blues | 4534 | Species | Taxom |
| Lycidae Laporte, 1836 | Lycid beetles | 818 | Species | Taxom |
| Lygistorrhinidae Hendel, 1936 | Long beaked fungus gnat | 19 | Species | Taxom |
| Lymexylidae Fleming, 1821 | Ship-timber beetle | 51 | Species | Taxom |
| Lyonetiidae Stainton, 1854 | Lyonet Moths | 268 | Species | Taxom |
| Lypusidae Herrich-Schä..., 1857 | European bagworm moths | 9 | Species | Taxom |
| Macropsyllidae Oudemans, 1909 | | 1 | Species | Taxom |
| Magnocoleidae Hong, 1998 | | 1 | Species | Taxom |
| Maimetshidae (Rasnitsyn, 1975) | | 13 | Species | Taxom |
| Megachilidae Schenk, 1860 | And Resin Bees | 2176 | Species | Taxom |
| Megalodontesidae Konow, 1897 | | 47 | Species | Taxom |
| Megalopodidae Latreille, 1802 | Megalopodid Leaf Beetles | 167 | Species | Taxom |
| Megalopygidae Herrich-Schä..., 1855 | Crinkled Flannel Moths | 12 | Species | Taxom |
| Megalyridae Schletterer, 1889 | Megalyrid wasps | 63 | Species | Taxom |
| Megamerinidae Hendel, 1913 | Megamerinid flies | 18 | Species | Taxom |
| Megaspilidae Ashmead, 1893 | Megaspilid wasps | 182 | Species | Taxom |
| Melandryidae Leach, 1815 | False Darkling Beetle | 279 | Species | Taxom |
| Melittidae Schenk, 1860 | Melittid bees | 126 | Species | Taxom |
| Melittosphecidae Poinar & Dan..., 2006 | | 1 | Species | Taxom |
| Meloidae Gyllenhal, 1810 | Blister Beetle | 906 | Species | Taxom |
| Melolonthidae (Leach, 1817) | Chafers | 92 | Species | Taxom |
| Melyridae Leach, 1815 | Malachite Beetles | 795 | Species | Taxom |
| Mengeidae Pierce, 1908 | | 2 | Species | Taxom |
| Mengenillidae Kinzelbach, 1970 | | 14 | Species | Taxom |
| Meropeidae Espen-Petersen, 1921 | Earwig-flies | 4 | Species | Taxom |
| Mesocinetidae Kirejtshuk &..., 2010 | | 4 | Species | Taxom |
| Mesokristenseniidae Huang, Nel &..., 2010 | | 7 | Species | Taxom |
| Mesophantasmatidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Mesopsychidae Tillyard, 1917 | | 62 | Species | Taxom |
| Mesosciophilidae Rohdendorf, 1946 | | 21 | Species | Taxom |
| Mesoserphidae Kozlov, 1970 | | 34 | Species | Taxom |
| Metarbelidae (Strand, 1909) | Tropical Carpenterworm Moths | 1 | Species | Taxom |
| Metropatoridae Handlirsch, 1906 | | 1 | Species | Taxom |
| Micromalthidae Barber, 1913 | Micromalthid beetles | 4 | Species | Taxom |
| Micronoctuidae Fibiger, 2005 | | 93 | Species | Taxom |
| Micropezidae Illiger, 1798 | Stilt Flies | 185 | Species | Taxom |
| Microphoridae (Chvala, 1983) | | 1 | Species | Taxom |
| Micropterigidae Herrich-Schä..., 1855 | Mandibulate Archaic Moths | 125 | Species | Taxom |
| Milichiidae Schiner, 1862 | Filth flies | 203 | Species | Taxom |
| Millieriidae (Stainton, 1854) | | 2 | Species | Taxom |
| Mimallonidae Burmeister, 1878 | Mimallonid Moths | 17 | Species | Taxom |
| Mirinidae (Kozlov, 1985) | | 2 | Species | Taxom |
| Mirolydidae Wang, Rasnit..., 2017 | | 1 | Species | Taxom |
| Mnesarchaeidae Eyer, 1924 | New Zealand Primitive Moths | 2 | Species | Taxom |
| Molannidae Wallengren, 1891 | Hood Casemaker Caddisflies | 24 | Species | Taxom |
| Monomachidae Ashmead, 1902 | Monomachid wasps | 3 | Species | Taxom |
| Monotomidae Laporte, 1840 | Minute Clubbed Beetles | 142 | Species | Taxom |
| Mordellidae Latreille, 1802 | Pintail beetles | 1006 | Species | Taxom |
| Muchoriidae Willmann, 1989 | | 1 | Species | Taxom |
| Muscidae Latreille, 1802 | Face flies | 3733 | Species | Taxom |
| Musidoromimidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Mutillidae André, 1907 | Cow ant | 473 | Species | Taxom |
| Mycetobiidae Winnertz, 1863 | | 1 | Species | Taxom |
| Mycetophagidae Leach, 1815 | Hairy fungus beetle | 79 | Species | Taxom |
| Mycetophilidae Newman, 1834 | Fungus Gnat | 6520 | Species | Taxom |
| Mycteridae Blanchard, 1845 | Mycterid beetles | 26 | Species | Taxom |
| Mydidae Bezzi, 1903 | Mydas flies | 70 | Species | Taxom |
| Mymaridae Haliday, 1833 | Fairflies | 754 | Species | Taxom |
| Mymarommatidae Debauche, 1948 | False fairy wasp | 54 | Species | Taxom |
| Myrmecolacidae Saunders, 1872 | | 59 | Species | Taxom |
| Myrmosidae Fox, 1894 | Myrmosid Wasps | 12 | Species | Taxom |
| Mythicomyiidae Melander, 1902 | Micro Bee Flies | 30 | Species | Taxom |
| Nadipteridae Lukashevich, 1995 | | 4 | Species | Taxom |
| Nannochoristidae Tillyard, 1917 | | 7 | Species | Taxom |
| Nannodastiidae Papp, 1980 | | 3 | Species | Taxom |
| Necrotauliidae Handlirsch, 1906 | | 50 | Species | Taxom |
| Nedubroviidae Bashkuev, 2011 | | 6 | Species | Taxom |
| Nemestrinidae Macquart, 1834 | Tangle-veined flies | 123 | Species | Taxom |
| Nemonychidae Bedel, 1882 | Nemonychid weevils | 148 | Species | Taxom |
| Neopseustidae Hering, 1925 | Archaic Bell Moths | 4 | Species | Taxom |
| Nepticulidae Stainton, 1854 | Leaf miners | 857 | Species | Taxom |
| Neriidae Hendel, 1916 | Banana stalk flies | 36 | Species | Taxom |
| Neurochaetidae Mcalpine, 1978 | Upside-Down Flies | 6 | Species | Taxom |
| Ningxiapsychidae Hong & Li, 2004 | | 1 | Species | Taxom |
| Nitidulidae Latreille, 1802 | Nitidules | 925 | Species | Taxom |
| Noctuidae Latreille, 1809 | Armyworms | 8551 | Species | Taxom |
| Noctuiidae | | 1 | Species | Taxom |
| Nolidae Hampson, 1894 | Hatted Caterpillars | 868 | Species | Taxom |
| Nosodendridae Erichson, 1846 | Nosodendrid beetles | 44 | Species | Taxom |
| Noteridae C. G. Thomson, 1860 | Burrowing water beetle | 67 | Species | Taxom |
| Nothybidae Frey, 1927 | | 9 | Species | Taxom |
| Notodontidae Stephens, 1829 | Bag Shelter Moths | 1341 | Species | Taxom |
| Nycteribiidae Samouelle, 1819 | Bat Flies | 45 | Species | Taxom |
| Nymphalidae Rafinesque, 1815 | Admirals | 5243 | Species | Taxom |
| Nymphomyiidae Tokunaga, 1932 | Nymphomyiid crane flies | 7 | Species | Taxom |
| Oborocoleidae Kukalová, 1968 | | 2 | Species | Taxom |
| Obrieniidae Zherikhin an..., 1994 | | 12 | Species | Taxom |
| Ochodaeidae Mulsant & Rey, 1870 | Sand-loving scarab beetle | 101 | Species | Taxom |
| Odiniidae Hendel, 1920 | Odiniid flies | 37 | Species | Taxom |
| Odontoceridae Wallengren, 1891 | Mortarjoint Casemaker Caddisflies | 111 | Species | Taxom |
| Oeconesidae Tillyard, 1921 | | 7 | Species | Taxom |
| Oecophoridae Bruand, 1851 | Concealer Moths | 794 | Species | Taxom |
| Oedemeridae Latreille, 1810 | False Blister Beetle | 407 | Species | Taxom |
| Oestridae Leach, 1815 | Bot flies | 104 | Species | Taxom |
| Omalisidae Lacordaire, 1857 | | 2 | Species | Taxom |
| Omethidae LeConte, 1861 | False fireflies | 17 | Species | Taxom |
| Ommatidae Sharp & Muir, 1912 | | 190 | Species | Taxom |
| Opetiidae Rondani, 1856 | Flat-footed flies | 10 | Species | Taxom |
| Opomyzidae (Fallen, 1820) | Opomyzid flies | 95 | Species | Taxom |
| Opostegidae Meyrick, 1893 | Opostegid moths | 42 | Species | Taxom |
| Orientisargidae Zhang, 2012 | | 1 | Species | Taxom |
| Ormyridae Förster, 1856 | Armyrids | 90 | Species | Taxom |
| Orsodacnidae Thomson, 1859 | Orsodacnid Leaf Beetles | 5 | Species | Taxom |
| Orthophlebiidae Handlirsch, 1906 | | 159 | Species | Taxom |
| Orussidae Newman, 1834 | Orussid wasps | 19 | Species | Taxom |
| Ostomatidae Reitter, 1882 | Bark-gnawing beetles | 1 | Species | Taxom |
| Othniodellithidae Engel & Huang, 2016 | | 2 | Species | Taxom |
| Otitidae (Macquart, 1835) | Picture-winged flies | 314 | Species | Taxom |
| Oxypeltidae Lacordaire, 1869 | | 1 | Species | Taxom |
| Pachylembiidae Ross, 2001 | | 1 | Species | Taxom |
| Pachyneuridae Schiner, 1864 | Dark-winged fungus gnats | 11 | Species | Taxom |
| Palaeomanteidae Handlirsch, 1906 | | 40 | Species | Taxom |
| Palaeophoridae Rohdendorf, 1951 | | 1 | Species | Taxom |
| Palaeosetidae Turner, 1922 | Miniature Ghost Moths | 4 | Species | Taxom |
| Palaephatidae Davis, 1986 | Gondwanaland Moths | 3 | Species | Taxom |
| Paleomelittidae Engel, 2001 | | 1 | Species | Taxom |
| Pallopteridae Loew, 1862 | Flutter flies | 70 | Species | Taxom |
| Pamphiliidae Cameron, 1890 | Leaf-rolling sawflies | 154 | Species | Taxom |
| Panorpidae Linnaeus, 1758 | Common scorpionflies | 575 | Species | Taxom |
| Panorpodidae Byers, 1965 | Short-faced scorpionflies | 27 | Species | Taxom |
| Pantophthalmidae Williston, 1906 | Timber flies | 1 | Species | Taxom |
| Papilionidae Latreille, 1802 | Apollos | 1069 | Species | Taxom |
| Parachoristidae Tillyard, 1937 | | 8 | Species | Taxom |
| Parahygrobiidae Ponomarenko, 1977 | Extinct family | 1 | Species | Taxom |
| Parandrexidae Kirejtshuk, 1994 | | 7 | Species | Taxom |
| Parapamphiliidae Rasnitsyn, 1968 | | 1 | Species | Taxom |
| Paraxymyiidae Rohdendorf, 1946 | Paxylommatid wasps | 8 | Species | Taxom |
| Paroryssidae Martynov, 1925 | | 11 | Species | Taxom |
| Passalidae Leach, 1815 | Bess beetle | 331 | Species | Taxom |
| Passalopalpidae Boucher & Bai, 2016 | | 1 | Species | Taxom |
| Passandridae (Erichson, 1845) | Parasitic flat bark beetle | 3 | Species | Taxom |
| Pediciidae Osten Sacken, 1860 | Hairy-Eyed Crane Flies | 82 | Species | Taxom |
| Pelecinidae Haliday, 1839 | Ancestral And Modern Pelecinid Wasps | 55 | Species | Taxom |
| Pelecorhynchidae Philip, 1941 | Pelecorhynchid flies | 7 | Species | Taxom |
| Peradeniidae Naumann & Ma..., 1985 | | 1 | Species | Taxom |
| Pergidae Rohwer, 1911 | Pergid flies | 8 | Species | Taxom |
| Perilampidae Latreille, 1809 | Perilampid waps | 163 | Species | Taxom |
| Periscelididae Oldenberg, 1914 | Periscelidid Flies | 37 | Species | Taxom |
| Perissommatidae Colless, 1962 | | 7 | Species | Taxom |
| Permocentropidae Martynov, 1932 | | 1 | Species | Taxom |
| Permochoristidae Tillyard, 1918 | | 192 | Species | Taxom |
| Permocupedidae Martynov, 1933 | | 32 | Species | Taxom |
| Permopanorpidae Tillyard, 1926 | | 5 | Species | Taxom |
| Permosialidae Martynov, 1928 | | 28 | Species | Taxom |
| Permosynidae Tillyard, 1924 | | 16 | Species | Taxom |
| Permotanyderidae Riek, 1953 | | 1 | Species | Taxom |
| Permotipulidae Tillyard, 1929 | | 2 | Species | Taxom |
| Phaeomyiidae (Verbeke, 1950) | Marsh flies | 7 | Species | Taxom |
| Phalacridae Leach, 1815 | Shining flower beetles | 108 | Species | Taxom |
| Phengodidae LeConte, 1861 | Glow-worms | 40 | Species | Taxom |
| Philopotamidae Stephens, 1829 | Finger Net caddisflies | 786 | Species | Taxom |
| Philorheithridae Mosely, 1936 | | 2 | Species | Taxom |
| Phloeostichidae Reitter, 1911 | | 1 | Species | Taxom |
| Phloiophilidae Kiesenwetter, 1863 | | 3 | Species | Taxom |
| Phoridae Curtis, 1833 | Coffin Flies | 2132 | Species | Taxom |
| Phryganeidae (Leach, 1815) | Giant casemaker | 127 | Species | Taxom |
| Phryganopsychidae Wiggins, 1959 | | 4 | Species | Taxom |
| Phthanoxenidae Engel & Huang, 2016 | | 1 | Species | Taxom |
| Phycosecidae Crowson, 1952 | | 0 | Species | Taxom |
| Pieridae Duponchel, 1835 | And Sulphurs | 1188 | Species | Taxom |
| Piophilidae Macquart, 1835 | Cheese flies | 104 | Species | Taxom |
| Pipunculidae Walker, 1834 | Big headed flies | 975 | Species | Taxom |
| Platygastridae Haliday, 1833 | Platygastrid wasps | 694 | Species | Taxom |
| Platypezidae Fallen, 1815 | Flat footed flies | 159 | Species | Taxom |
| Platystomatidae Schiner, 1862 | Picture-winged flies | 585 | Species | Taxom |
| Pleciodictyidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Pleciofungivoridae Rohdendorf, 1946 | | 82 | Species | Taxom |
| Pleciomimidae Rodendorf, 1949 | | 30 | Species | Taxom |
| Plectrotarsidae Mosely, 1953 | | 1 | Species | Taxom |
| Pleocomidae LeConte, 1861 | Rain beetle | 6 | Species | Taxom |
| Plumalexiidae Brothers, 2011 | | 1 | Species | Taxom |
| Plutellidae Guenée, 1845 | Diamond-back moths | 223 | Species | Taxom |
| Podabrocephalidae Pic, 1930 | | 1 | Species | Taxom |
| Polycentropodidae Ulmer, 1903 | Tube Maker Caddisflies | 585 | Species | Taxom |
| Pompilidae Latreille, 1805 | Pompilid wasps | 1399 | Species | Taxom |
| Praeaulacidae Rasnitsyn, 1972 | | 84 | Species | Taxom |
| Praeichneumonidae Rasnitsyn, 1983 | | 5 | Species | Taxom |
| Praelateriidae Dolin, 1973 | | 1 | Species | Taxom |
| Praesiricidae Rasnitsyn, 1968 | | 15 | Species | Taxom |
| Prionoceridae Lacaordaire, 1857 | | 41 | Species | Taxom |
| Procramptonomyiidae Kovalev, 1985 | | 6 | Species | Taxom |
| Proctorenyxidae Lelej & Kozlov, 1999 | | 1 | Species | Taxom |
| Proctotrupidae Latreille, 1802 | Proctotrupid wasps | 133 | Species | Taxom |
| Prodoxidae Riley, 1881 | Yucca Moths | 33 | Species | Taxom |
| Promecheilidae Lacordaire, 1859 | | 2 | Species | Taxom |
| Proneottiophilidae Hennig, 1969 | | 1 | Species | Taxom |
| Prorhyacophilidae Riek, 1955 | | 2 | Species | Taxom |
| Prosepididontidae A Handlirsch, 1919 | | 1 | Species | Taxom |
| Prostomidae C. G. Thomson, 1859 | Jugular-horned beetle | 19 | Species | Taxom |
| Protapioceridae Ren, 1998 | | 4 | Species | Taxom |
| Protempididae Ussatchov, 1968 | | 2 | Species | Taxom |
| Protendipedidae Rohdendorf, 1962 | | 3 | Species | Taxom |
| Proterhinidae (Fauvel, 1891) | | 2 | Species | Taxom |
| Protobrachyceridae Rohdendorf, 1962 | | 3 | Species | Taxom |
| Protoligoneuridae Rohdendorf, 1962 | | 6 | Species | Taxom |
| Protomeropidae Tillyard, 1926 | | 12 | Species | Taxom |
| Protomphralidae Rohdendorf, 1957 | | 3 | Species | Taxom |
| Protopleciidae Rohdendorf, 1946 | | 50 | Species | Taxom |
| Protorhyphidae Handlirsch, 1906 | | 19 | Species | Taxom |
| Protoxenidae Pohl, Beutel..., 2005 | | 1 | Species | Taxom |
| Psammocharidae (Yasumatsu, 1935) | | 0 | Species | Taxom |
| Psephenidae Lacordaire, 1854 | Water pennies | 158 | Species | Taxom |
| Pseudonannochoristidae Novokshonov, 1994 | | 2 | Species | Taxom |
| Pseudopolycentropodidae Handlirsch, 1925 | | 14 | Species | Taxom |
| Pseudopomyzidae (Mcalpine, 1966) | Banana flies | 6 | Species | Taxom |
| Pseudopulicidae Gao, Shih & Ren, 2012 | | 6 | Species | Taxom |
| Pseudosiricidae Handlirsch, 1908 | | 2 | Species | Taxom |
| Pseudostenolestidae Garrouste & Nel, 2015 | | 1 | Species | Taxom |
| Psilidae Macquart, 1835 | Carrot flies | 333 | Species | Taxom |
| Psychidae Boisduval, 1828 | Bagmoths | 651 | Species | Taxom |
| Psychodidae Newman, 1834 | Drain flies | 1842 | Species | Taxom |
| Psychomyiidae Walker, 1852 | Net Tube Caddisflies | 473 | Species | Taxom |
| Pterogeniidae Crowson, 1953 | | 20 | Species | Taxom |
| Pterolonchidae Meyrick, 1918 | Lance Wing Moths | 2 | Species | Taxom |
| Pteromalidae Dalman, 1820 | Pteromalid wasps | 2340 | Species | Taxom |
| Pterophoridae Zeller, 1841 | Plume Moths | 1101 | Species | Taxom |
| Ptiliidae Heer, 1843 | Feather-wing beetles | 370 | Species | Taxom |
| Ptilodactylidae Laporte, 1836 | Ptilodactylid beetles | 180 | Species | Taxom |
| Ptinidae Latreille, 1802 | Death-watch and Spider Beetles | 708 | Species | Taxom |
| Ptismidae Kirejtshuk &..., 2016 | | 1 | Species | Taxom |
| Ptychopteridae Osten Sacken, 1862 | Phantom crane flies | 153 | Species | Taxom |
| Pulicidae Billberg, 1820 | Cat fleas | 83 | Species | Taxom |
| Pygiopsyllidae Wagner, 1939 | | 35 | Species | Taxom |
| Pyralidae Latreille, 1802 | Flour Moths | 3069 | Species | Taxom |
| Pyrgotidae Schiner, 1868 | Light Flies | 89 | Species | Taxom |
| Pyrochroidae Latreille, 1807 | Cardinal beetles | 72 | Species | Taxom |
| Pythidae Solier, 1834 | Dead log bark beetles | 6 | Species | Taxom |
| Radiophronidae Ortega-Blanc..., 2010 | | 2 | Species | Taxom |
| Rangomaramidae Jaschhof & D..., 2002 | | 8 | Species | Taxom |
| Rhaetaniidae (Krzemiń..., 2002) | | 1 | Species | Taxom |
| Rhagionemestriidae Ussatchov, 1968 | | 9 | Species | Taxom |
| Rhagionempididae Rohdendorf, 1938 | | 5 | Species | Taxom |
| Rhagionidae Latreille, 1802 | Snipe flies | 557 | Species | Taxom |
| Rhagophthalmidae Olivier, 1907 | | 8 | Species | Taxom |
| Rhiniidae Brauer & Ber..., 1889 | | 15 | Species | Taxom |
| Rhinophoridae Robineau-Des..., 1863 | Woodlouse flies | 126 | Species | Taxom |
| Rhipiceridae Latreille, 1834 | Cedar beetles | 23 | Species | Taxom |
| Rhipiphoridae Gemminger & ..., 1870 | Hump back beetles | 19 | Species | Taxom |
| Rhombocoleidae Rohdendorf, 1961 | | 23 | Species | Taxom |
| Rhopalopsyllidae Oudemans, 1909 | Marsupial fleas | 7 | Species | Taxom |
| Rhopalosomatidae Ashmead, 1896 | Rhopalosomatid wasps | 12 | Species | Taxom |
| Rhyacophilidae Stephens, 1836 | Free-living Caddisflies | 60 | Species | Taxom |
| Rhynchitidae Gistel, 1848 | Leaf-rolling weevils | 35 | Species | Taxom |
| Rhyphidae (Newman, 1834) | | 1 | Species | Taxom |
| Richardidae Snow, 1896 | Richardid flies | 7 | Species | Taxom |
| Richardiidae (Snow, 1896) | Picture-winged flies | 9 | Species | Taxom |
| Riodinidae Grote, 1895 | Metalmark Butterflies | 378 | Species | Taxom |
| Ripiphoridae Gemminger & ..., 1870 | Rhipiphoridae | 67 | Species | Taxom |
| Robinjohniidae Martynova, 1948 | | 2 | Species | Taxom |
| Roeslerstammiidae Bruand, 1850 | Double-eye moths | 10 | Species | Taxom |
| Ropalomeridae Linder, 1930 | Ropalomerid flies | 2 | Species | Taxom |
| Roproniidae Bradley, 1905 | Roproniid wasps | 12 | Species | Taxom |
| Rutelidae (MacLeay, 1819) | | 93 | Species | Taxom |
| Salpingidae Leach, 1815 | Narrow-waisted bark beetle | 152 | Species | Taxom |
| Sapygidae Latreille, 1810 | Club-horned wasps | 16 | Species | Taxom |
| Sarcophagidae Macquart, 1834 | Flesh flies | 1658 | Species | Taxom |
| Saturniidae Boisduval, 1837 | And Giant Silk Moths | 478 | Species | Taxom |
| Satyridae Boisduval, 1833 | Browns | 1 | Species | Taxom |
| Saurophthiridae Ponomarenko, 1986 | | 2 | Species | Taxom |
| Saxonagrionidae Nel & al., 1999 | | 1 | Species | Taxom |
| Scaphocoridae Popov, 1968 | | 1 | Species | Taxom |
| Scarabaeidae Latreille, 1802 | Dung beetles | 16403 | Species | Taxom |
| Scarabaidae | | 1 | Species | Taxom |
| Scathophagidae Robineau-Des..., 1830 | Dung flies | 690 | Species | Taxom |
| Scatopsidae Newman, 1834 | Dung midges | 288 | Species | Taxom |
| Scelionidae Haliday, 1839 | Scelionid wasps | 1459 | Species | Taxom |
| Scenopinidae Burmeister, 1835 | Window Flies | 105 | Species | Taxom |
| Schizocoleidae Rohdendorf, 1961 | | 80 | Species | Taxom |
| Schizophoridae Ponomarenko, 1968 | | 55 | Species | Taxom |
| Schizopodidae (LeConte, 1859) | False Jewel Beetles | 2 | Species | Taxom |
| Schreckensteiniidae Fletcher, 1929 | Bristle Legged Moths | 2 | Species | Taxom |
| Sciaridae Billberg, 1820 | Black fungus gnats | 266 | Species | Taxom |
| Sciomyzidae Fallen, 1820 | Marsh Flies | 398 | Species | Taxom |
| Scirtidae Fleming, 1821 | Marsh Beetle | 477 | Species | Taxom |
| Sclerogibbidae Ashmead, 1902 | Sclerogibbid wasp | 15 | Species | Taxom |
| Scolebythidae Evans, 1963 | Scolebythid wasps | 20 | Species | Taxom |
| Scoliidae Leach, 1815 | Mammoth wasps | 157 | Species | Taxom |
| Scolytidae (Latreille, 1807) | Ambrosia | 5 | Species | Taxom |
| Scraptiidae Mulsant, 1856 | Antlike leaf beetles | 239 | Species | Taxom |
| Scydmaenidae (Leach, 1815) | Ant-like stone beetles | 2511 | Species | Taxom |
| Scythrididae Rebel, 1901 | Flower Moths | 50 | Species | Taxom |
| Sematuridae Guenée, 1858 | American Swallowtail Moths | 3 | Species | Taxom |
| Sepsidae Walker, 1833 | Black scavenger flies | 329 | Species | Taxom |
| Septiventeridae Bai & al., 2013 | | 1 | Species | Taxom |
| Sepulcidae Rasnitsyn, 1968 | | 43 | Species | Taxom |
| Serendipidae Evenhuis, 1994 | | 3 | Species | Taxom |
| Sericostomatidae Stephens, 1836 | Bushtailed Caddisflies | 64 | Species | Taxom |
| Serphitidae Brues, 1937 | | 13 | Species | Taxom |
| Sesiidae Boisduval, 1828 | Clear Wings | 739 | Species | Taxom |
| Siberhyphidae Kovalev, 1985 | | 1 | Species | Taxom |
| Sibiriothaumatidae Sukatcheva &..., 1998 | | 1 | Species | Taxom |
| Sierolomorphidae Krombein, 1951 | Sierolomorphid wasp | 2 | Species | Taxom |
| Signiphoridae Howard, 1894 | Signiphorid waps | 24 | Species | Taxom |
| Silphidae Latreille, 1807 | Burying And Carrion Beetles | 237 | Species | Taxom |
| Silvanidae Kirby, 1837 | Flat bark beetles | 261 | Species | Taxom |
| Simaethistidae Minet, 1991 | | 1 | Species | Taxom |
| Simuliidae Newman, 1834 | Black flies | 1540 | 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 | 90 | Species | Taxom |
| Smicripidae Horn, 1879 | Palmetto beetle | 4 | Species | Taxom |
| Sojanocoleidae Martynov, 1932 | | 1 | Species | Taxom |
| Somabrachyidae Hampson, 1920 | African Flannel Moths | 1 | Species | Taxom |
| Sonidae Pritykina, 1986 | | 1 | Species | Taxom |
| Soyaniidae Shcherbakov, 2015 | | 1 | Species | Taxom |
| Spaniidae (Nagatomi, 1982) | | 3 | Species | Taxom |
| Spathiopterygidae Engel & Orte..., 2013 | | 5 | Species | Taxom |
| Sphaeritidae Schuckard, 1839 | False clown beetle | 7 | Species | Taxom |
| Sphaeriusidae Erichson, 1845 | Minute Bog Beetles | 16 | Species | Taxom |
| Sphaeroceridae Macquart, 1835 | Dung flies | 1086 | Species | Taxom |
| Sphecidae Latreille, 1802 | Digger & Sand wasps | 517 | Species | Taxom |
| Sphindidae Jacquelin du..., 1860 | Cryptic slime mold beetle | 28 | Species | Taxom |
| Sphingidae Latreille, 1802 | Hawk Moths | 994 | Species | Taxom |
| Staphylinidae Lameere, 1900 | Rove beetles | 33487 | Species | Taxom |
| Stenopsychidae Martynov, 1924 | | 104 | Species | Taxom |
| Stenotrachelidae C. G. Thomson, 1859 | False long-horned beetles | 22 | Species | Taxom |
| Stephanidae Leach, 1815 | Crown wasp | 61 | Species | Taxom |
| Stigmaphronidae Kozlov, 1975 | Stigmaphronid wasps | 21 | Species | Taxom |
| Stivaliidae Mardon, 1978 | | 91 | Species | Taxom |
| Stolamissidae Liu & Engel, 2007 | | 1 | Species | Taxom |
| Strashilidae Rasnitsyn, 1992 | | 3 | Species | Taxom |
| Stratiomyidae Latreille, 1802 | Soldier flies | 1242 | Species | Taxom |
| Streblidae (Kolenati, 1863) | Bat flies | 66 | Species | Taxom |
| Strongylophthalmyiidae Hennig, 1940 | Strongylophthalmyiid flies | 76 | Species | Taxom |
| Stylopidae Kirby, 1813 | Strepsiptera | 154 | Species | Taxom |
| Symmocidae (Gozmany, 1957) | Symmocid Moths | 1 | Species | Taxom |
| Synchroidae Lacordaire, 1859 | Synchroa bark beetles | 3 | Species | Taxom |
| Synteliidae Lewis, 1882 | | 12 | Species | Taxom |
| Syrphidae Latreille, 1802 | Drone flies | 4926 | Species | Taxom |
| Syspastoxyelidae Engel & Huang, 2016 | | 1 | Species | Taxom |
| Tabanidae Latreille, 1802 | Breeze flies | 2379 | Species | Taxom |
| Tachinidae (Robineau-Des..., 1830) | Bristle Flies | 5091 | Species | Taxom |
| Tachiniscidae (Kertesz, 1903) | | 1 | Species | Taxom |
| Taimyrocoridae Popov, 2016 | | 1 | Species | Taxom |
| Taldycupedidae Rohdendorf, 1961 | | 31 | Species | Taxom |
| Tanaostigmatidae Howard, 1890 | Tanaostigmatid wasps | 6 | Species | Taxom |
| Tanyderidae Alexander, 1919 | Primitive crane flies | 44 | Species | Taxom |
| Tanyderophryneidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Tanypezidae Rondani, 1856 | Stretched-foot flies | 2 | Species | Taxom |
| Tasimiidae Riek, 1968 | | 1 | Species | Taxom |
| Taymyrelectronidae Botosaneanu ..., 1983 | | 1 | Species | Taxom |
| Tenebrionidae Latreille, 1802 | Darkling Beetle | 3408 | Species | Taxom |
| Tenthredinidae Latreille, 1804 | Common sawflies | 2780 | Species | Taxom |
| Tephritidae Newman, 1834 | Fruit flies | 2945 | Species | Taxom |
| Teratomyzidae Hennig, 1969 | Fern Flies | 0 | Species | Taxom |
| Teredidae Seidlitz, 1888 | | 117 | Species | Taxom |
| Tethepomyiidae Grimaldi & A..., 2008 | | 1 | Species | Taxom |
| Tethinidae (Hendel, 1916) | Tethinid flies | 107 | Species | Taxom |
| Tetracampidae Förster, 1856 | Tetracampid wasps | 39 | Species | Taxom |
| Tetratomidae Billberg, 1820 | Polypore fungus beetle | 83 | Species | Taxom |
| Thanerocleridae Chapin, 1921 | | 10 | Species | Taxom |
| Thaumaleidae Bezzi, 1913 | Solitary midges | 117 | Species | Taxom |
| Thaumatomeropidae Willmann, 1978 | | 5 | Species | Taxom |
| Therevidae Newman, 1834 | Stiletto flies | 461 | Species | Taxom |
| Throscidae Laporte, 1840 | False metallic wood-boring beetles | 94 | Species | Taxom |
| Thyatiridae (Blake, 1936) | False Owlet Moths | 0 | Species | Taxom |
| Thynnidae Shuckard, 1841 | Thynnid Wasps | 45 | Species | Taxom |
| Thyrididae Herrich-Schä..., 1846 | Picture Winged Leaf Moths | 190 | Species | Taxom |
| Tineidae Latreille, 1810 | & Allies | 1662 | Species | Taxom |
| Tineodidae Meyrick, 1885 | False Plume Moths | 1 | Species | Taxom |
| Tiphiidae Leach, 1815 | Flower wasps | 210 | Species | Taxom |
| Tipulidae Latreille, 1802 | Crane Flies | 8518 | Species | Taxom |
| Tipulodictyidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Tipulopleciidae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Tischeriidae Spuler, 1898 | Lyonetiid moths | 50 | Species | Taxom |
| Tomiochoristidae Martynova, 1958 | | 6 | Species | Taxom |
| Torridincolidae Steffan, 1964 | | 2 | Species | Taxom |
| Tortricidae Latreille, 1803 | Bell Moths | 5935 | Species | Taxom |
| Torymidae Walker, 1833 | Apple seed chalcids | 621 | Species | Taxom |
| Trachypachidae C. G. Thomson, 1857 | False ground beetle | 82 | Species | Taxom |
| Triadocupedidae (Ponomarenko, 1966) | | 1 | Species | Taxom |
| Triaplidae Ponomarenko, 1977 | Extinct family | 4 | Species | Taxom |
| Trichoceridae Rondani, 1841 | Winter Crane Flies | 406 | Species | Taxom |
| Trichogrammatidae Haliday, 1851 | Trichogrammatid wasps | 465 | Species | Taxom |
| Tricoleidae (Ponomarenko, 1969) | | 17 | Species | Taxom |
| Trictenotomidae Blanchard, 1845 | Croc beetles | 18 | Species | Taxom |
| Trigonalidae (Cresson, 1887) | Trigonalid sawflies | 26 | Species | Taxom |
| Trigonalyidae | | 3 | Species | Taxom |
| Tritarsidae Hong, 2002 | | 1 | Species | Taxom |
| Trogidae (MacLeay, 1819) | Gnawer beetles | 201 | Species | Taxom |
| Trogossitidae Latreille, 1802 | Bark gnawing beetle | 144 | Species | Taxom |
| Tshekarchiereidae Novokshonov, 1997 | | 1 | Species | Taxom |
| Tshekardocoleidae Rohdendorf, 1944 | | 21 | Species | Taxom |
| Uenoidae Iwata, 1927 | Stonecase Caddisflies | 7 | Species | Taxom |
| Ulidiidae Macquart, 1835 | Picture-winged Flies | 53 | Species | Taxom |
| Ulyanidae (Zherikhin, 1993) | | 2 | Species | Taxom |
| Undopterigidae (Kozlov, 1988) | | 1 | Species | Taxom |
| Uraloptysmatidae (VD Ivanov, 1992) | | 1 | Species | Taxom |
| Uraniidae Blanchard, 1845 | Swallowtail Moths | 260 | Species | Taxom |
| Uranorhagionidae Zhang, Yang ..., 2010 | | 5 | Species | Taxom |
| Urodidae Kyrki, 1984 | False Burnet Moths | 3 | Species | Taxom |
| Valeseguyidae Amorim & Gri..., 2006 | | 1 | Species | Taxom |
| Vanhorniidae Crawford, 1909 | Vanhorniid wasps | 2 | Species | Taxom |
| Vermileonidae Williston, 1886 | Wormlion | 25 | Species | Taxom |
| Vermipsyllidae Wagner, 1889 | Carnivore fleas | 39 | Species | Taxom |
| Vesperidae Mulsant, 1839 | Vesperid longicorn beetles | 47 | Species | Taxom |
| Vespidae Leach, 1815 | And Allies | 1463 | Species | Taxom |
| Vitimotauliidae Sukatsheva, 1968 | | 25 | Species | Taxom |
| Vladipteridae Shcherbakov, 1995 | | 4 | Species | Taxom |
| Volitorididae Hong, 1982 | | 1 | Species | Taxom |
| Xenasteiidae Hardy, 1980 | | 4 | Species | Taxom |
| Xenidae Pohl & Beutel, 2005 | | 44 | Species | Taxom |
| Xiphiopsyllidae Wagner, 1939 | | 1 | Species | Taxom |
| Xiphocentronidae Schmid, 1982 | | 93 | Species | Taxom |
| Xiphydriidae Leach, 1819 | Wood wasps | 35 | Species | Taxom |
| Xyelidae Newman, 1835 | Sawfly | 160 | Species | Taxom |
| Xyelotomidae Rasnitsyn, 1968 | | 23 | Species | Taxom |
| Xyelydidae Rasnitsyn, 1968 | | 34 | Species | Taxom |
| Xylomyidae Verrall, 1901 | Wood soldier flies | 123 | Species | Taxom |
| Xylophagidae Fallen, 1810 | Awl-flies | 123 | Species | Taxom |
| Xyloryctidae Meyrick, 1890 | Flower Moths | 402 | Species | Taxom |
| Yantarocentridae Ivanov & Mel..., 2015 | | 1 | Species | Taxom |
| Yponomeutidae Stephens, 1829 | Ermine Moths | 523 | Species | Taxom |
| Ypsolophidae Guenée, 1845 | Ypsolophid Moths | 134 | Species | Taxom |
| Zhangsolvidae Nagatomi & Yang, 1998 | | 5 | Species | Taxom |
| Zopheridae Solier, 1834 | Cylindrical bark beetles | 341 | Species | Taxom |
| Zygaenidae Latreille, 1809 | Burnet Forester | 578 | Species | Taxom |
