| Acanthosomatidae Signoret, 1864 | Acanthosomatids | 149 | Species | Taxom |
| Achilidae Stål, 1866 | Achilid Planthoppers | 25 | Species | Taxom |
| Aclerdidae Ferris, 1937 | Aclerdid scales | 18 | Species | Taxom |
| Acrididae MacLeay, 1819 | Grasshoppers and locusts | 495 | Species | Taxom |
| Acroceridae Leach, 1815 | Hunch-back flies | 22 | Species | Taxom |
| Adelgidae Heinze, 1962 | Adelgids | 5 | Species | Taxom |
| Adelidae Bruand, 1851 | Adelid Moths | 18 | Species | Taxom |
| Aderidae Winkler, 1927 | Ant-like leaf beetles | 49 | Species | Taxom |
| Adocimycolidae Poinar and Vega, 2023 | | 1 | Species | Taxom |
| Aenictopecheidae Usinger, 1932 | | 3 | Species | Taxom |
| Aeolothripidae Uzel, 1895 | Banded thrips | 16 | Species | Taxom |
| Aeshnidae Rambur, 1842 | Darners | 70 | Species | Taxom |
| Aetalionidae Spinola, 1850 | Treehopper | 1 | Species | Taxom |
| Agaonidae Walker, 1848 | Fig wasp | 64 | Species | Taxom |
| Agromyzidae Fallen, 1823 | Leaf miner flies | 222 | Species | Taxom |
| Agyrtidae Thomson, 1859 | Primitive carrion beetles | 23 | Species | Taxom |
| Aleyrodidae Westwood, 1840 | Whiteflies | 381 | Species | Taxom |
| Alienopteridae Bai & al., 2016 | | 14 | Species | Taxom |
| Alucitidae Leach, 1815 | Many Plumed Moths | 31 | Species | Taxom |
| Alydidae Amyot & Serv..., 1843 | Bean bugs | 99 | Species | Taxom |
| Amorphoscelidae Stål, 1877 | | 8 | Species | Taxom |
| Amphientomidae Enderlein, 1903 | Tropical Barklice | 13 | Species | Taxom |
| Amphipsocidae Mockford, 1978 | Hairy-winged Barklice | 9 | Species | Taxom |
| Amphipterygidae Selys, 1853 | | 1 | Species | Taxom |
| Amphizoidae LeConte, 1853 | Stout-stream beetles | 3 | Species | Taxom |
| Ampulicidae Shuckard, 1840 | Ampulicid wasps | 105 | Species | Taxom |
| Ancistropsyllidae Toumanoff & ..., 1947 | | 1 | Species | Taxom |
| Andrenidae Webster, 1913 | Andrenid bees | 317 | Species | Taxom |
| Anisolabididae Verhoeff, 1902 | | 7 | Species | Taxom |
| Anisopodidae Knab, 1912 | Window Midges | 12 | Species | Taxom |
| Anomalopsychidae Flint, 1981 | | 8 | Species | Taxom |
| Anostostomatidae Saussure, 1859 | Wetas & King Crickets | 8 | Species | Taxom |
| Anthelidae Turner, 1904 | Australian Lappet Moths | 4 | Species | Taxom |
| Anthicidae Latreille, 1819 | Ant beetles | 161 | Species | Taxom |
| Anthocoridae Fieber, 1837 | Flower bugs | 13 | Species | Taxom |
| Anthomyiidae Robineau-Des..., 1830 | Anthomyiid flies | 78 | Species | Taxom |
| Anthomyzidae Czerny, 1903 | Anthomyzid flies | 2 | Species | Taxom |
| Anthribidae Billberg, 1820 | Fungus Weevil | 164 | Species | Taxom |
| Apachyidae Verhoeff, 1902 | | 1 | Species | Taxom |
| Apataniidae Wallengren, 1886 | Early Smoky Wing Sedges | 127 | Species | Taxom |
| Aphalaridae Löw, 1879 | | 26 | Species | Taxom |
| Aphelinidae Thomson, 1876 | Aphelinid wasps | 151 | Species | Taxom |
| Aphelocheiridae Fieber, 1851 | | 85 | Species | Taxom |
| Aphididae Latreille, 1802 | Aphids | 248 | Species | Taxom |
| Aphodiidae Leach, 1815 | | 9 | Species | Taxom |
| Aphrophoridae Evans, 1946 | Froghoppers | 19 | Species | Taxom |
| Apidae Latreille, 1802 | Bumble bees | 885 | Species | Taxom |
| Aradidae Spinola, 1837 | Flat bug | 15 | Species | Taxom |
| Archeocrypticidae Kaszab, 1964 | Ancient Fungus Beetles | 11 | Species | Taxom |
| Archimylacridae Handlirsch, 1906 | | 2 | Species | Taxom |
| Archipsocidae Enderlein, 1903 | Ancient Barklice | 3 | Species | Taxom |
| Arctiidae Leach, 1815 | Footman moths | 28 | Species | Taxom |
| Argidae Konow, 1890 | Argid flies | 14 | Species | Taxom |
| Artematopodidae Lacordaire, 1857 | Soft bodied plant beetle | 5 | Species | Taxom |
| Artheneidae Stål, 1872 | | 2 | Species | Taxom |
| Arthropleidae Balthasar, 1937 | Flatheaded Mayflies | 1 | Species | Taxom |
| Ascalaphidae Rambur, 1842 | Owlflies | 10 | Species | Taxom |
| Aschiphasmatidae Brunner von ..., 1893 | | 22 | Species | Taxom |
| Asilidae Latreille, 1802 | Assassin flies | 637 | Species | Taxom |
| Aspidytidae Ribera, Beu..., 2002 | Cliff water beetles | 1 | Species | Taxom |
| Asteiidae Rondani, 1856 | Asteiid Flies | 6 | Species | Taxom |
| Asterolecaniidae Cockerell, 1896 | Asterolecaniids | 142 | Species | Taxom |
| Athericidae Stuckenberg, 1973 | Athericid flies | 10 | Species | Taxom |
| Attelabidae Billberg, 1820 | Leaf Rolling Weevil | 513 | Species | Taxom |
| Aulacidae Shuckard, 1842 | Aulacid wasps | 35 | Species | Taxom |
| Aulacigastridae Wollaston, 1864 | Aulacigastrid flies | 3 | Species | Taxom |
| Autostichidae Le Marchand, 1947 | Autostichid Moths | 49 | Species | Taxom |
| Baetidae Leach, 1815 | Mayflies | 45 | Species | Taxom |
| Batrachedridae Heinemann & ..., 1876 | Batrachedrid Moths | 25 | Species | Taxom |
| Bedelliidae (Stainton, 1849) | | 0 | Species | Taxom |
| Beesoniidae Ferris, 1950 | Beesoniids | 11 | Species | Taxom |
| Belmontiidae Tillyard, 1919 | | 0 | Species | Taxom |
| Belostomatidae Leach, 1815 | Alligator ticks | 11 | Species | Taxom |
| Beraeidae Wallengren, 1891 | Small eastern caddisflies | 3 | Species | Taxom |
| Berothidae Handlirsch, 1906 | Beaded lacewing | 1 | Species | Taxom |
| Berytidae Fieber, 1851 | Stilt bug | 22 | Species | Taxom |
| Bethylidae Halliday, 1839 | Bethylid wasps | 39 | Species | Taxom |
| Bibionidae Fleming, 1821 | Bibionid flies | 65 | Species | Taxom |
| Biphyllidae LeConte, 1861 | Biphyllid beetles | 17 | Species | Taxom |
| Bittacidae Handlirsch, 1906 | Hanging scorpionflies | 84 | Species | Taxom |
| Blaberidae Saussure, 1864 | Blaberids | 469 | Species | Taxom |
| Blattellidae (Karny, 1908) | German Cockroach | 345 | Species | Taxom |
| Blattidae Stephens, 1829 | American cockroaches | 151 | Species | Taxom |
| Blattulidae Vishnyokova, 1982 | | 5 | Species | Taxom |
| Blephariceridae Loew, 1861 | Mountain midges | 15 | Species | Taxom |
| Blissidae Stål, 1862 | Chinch Bugs | 43 | Species | Taxom |
| Bombycidae Latreille, 1802 | Lappet moths | 49 | Species | Taxom |
| Bombyliidae Latreille, 1802 | Bee Flies | 273 | Species | Taxom |
| Boopiidae Mjöberg, 1910 | | 1 | Species | Taxom |
| Boreidae Latreille, 1816 | Snow fleas | 2 | Species | Taxom |
| Bostrichidae Latreille, 1802 | Auger beetles | 159 | Species | Taxom |
| Bothrideridae Erichson, 1845 | Cocoon-forming beetles | 14 | Species | Taxom |
| Brachodidae Agenjo, 1966 | Little Bear Moths | 22 | Species | Taxom |
| Brachycentridae Ulmer, 1903 | Humpless Casemaker Caddisflies | 11 | Species | Taxom |
| Brachyceridae (Billberg, 1820) | Brachycerids | 1 | Species | Taxom |
| Brachypsectridae LeConte & Horn, 1883 | Texas beetle | 1 | Species | Taxom |
| Brachypteridae (Erichson, 1845) | Short-winged Flower Beetles | 11 | Species | Taxom |
| Brachystomatidae Melander, 1908 | | 1 | Species | Taxom |
| Braconidae Latreille, 1829 | Braconid wasps | 2097 | Species | Taxom |
| Bradynobaenidae Saussure, 1892 | Bradynobaenid wasps | 1 | Species | Taxom |
| Brahmaeidae Swinhoe, 1892 | Brahmin Moths | 6 | Species | Taxom |
| Braulidae Egger, 1853 | Bee lice | 2 | Species | Taxom |
| Brentidae Billberg, 1820 | Brenthidae | 802 | Species | Taxom |
| Buprestidae Leach, 1815 | Flat-headed wood-borers | 194 | Species | Taxom |
| Burmacoccidae Koteja, 2004 | | 1 | Species | Taxom |
| Byrrhidae Latreille, 1804 | Moss beetles | 70 | Species | Taxom |
| Byturidae Jacquelin du..., 1858 | Fruit worms | 3 | Species | Taxom |
| Caeciliusidae Kolbe, 1880 | Lizard Barklice | 43 | Species | Taxom |
| Caenidae Newman, 1853 | Small square-gill mayflies | 15 | Species | Taxom |
| Calamoceratidae Ulmer, 1905 | | 59 | Species | Taxom |
| Caliscelidae Amyot & Serv..., 1843 | Piglet Bugs | 18 | Species | Taxom |
| Callidulidae Moore, 1877 | Old World Butterfly Moths | 15 | Species | Taxom |
| Callipharixenidae Pierce, 1918 | | 1 | Species | Taxom |
| Calliphoridae Brauer & Ber..., 1889 | Blow flies | 192 | Species | Taxom |
| Callirhipidae Emden, 1924 | Callirhipid beetles | 8 | Species | Taxom |
| Calophyidae Vondracek, 1957 | | 11 | Species | Taxom |
| Calopsocidae (Pearman, 1936) | Common barklice | 1 | Species | Taxom |
| Calopterygidae Selys, 1850 | Broad-winged damselflies | 14 | Species | Taxom |
| Canaceidae (Jones, 1906) | Beach flies | 5 | Species | Taxom |
| Canacidae Jones, 1906 | Beach Flies | 1 | Species | Taxom |
| Cantharidae Imhoff, 1856 | Cantharids | 263 | Species | Taxom |
| Capniidae Klapálek, 1905 | Capniid winter stoneflies | 72 | Species | Taxom |
| Carabidae Latreille, 1802 | Carabid beetles | 4235 | Species | Taxom |
| Carcinophoridae Hincks, 1954 | | 13 | Species | Taxom |
| Carnidae Newman, 1834 | Bird flies | 10 | Species | Taxom |
| Carposinidae Walsingham, 1907 | Carposinid moths | 41 | Species | Taxom |
| Carsidaridae Crawford, 1911 | | 8 | Species | Taxom |
| Castniidae Boisduval, 1828 | Castniid moths | 2 | Species | Taxom |
| Cecidomyiidae Newman, 1834 | Forest Midges | 492 | Species | Taxom |
| Celyphidae Bigot, 1852 | Beetle flies | 19 | Species | Taxom |
| Cerambycidae Latreille, 1802 | Long Horn beetles | 2138 | Species | Taxom |
| Ceraphronidae Haliday, 1833 | Ceraphronid wasps | 2 | Species | Taxom |
| Ceratocombidae Fieber, 1861 | | 15 | Species | Taxom |
| Ceratophyllidae Dampf, 1908 | Bird Fleas | 59 | Species | Taxom |
| Ceratopogonidae Newman, 1834 | Biting midge | 337 | Species | Taxom |
| Cercopidae Leach, 1815 | Froghopper | 152 | Species | Taxom |
| Cerococcidae Balachowsky, 1942 | Cerococcids | 29 | Species | Taxom |
| Cerophytidae Latreille, 1834 | Cerophytid beetles | 1 | Species | Taxom |
| Cerylonidae Billberg, 1820 | Cerylid Kingfishers | 33 | Species | Taxom |
| Chalcididae Latreille, 1817 | Chalcidid wasps | 171 | Species | Taxom |
| Chamaemyiidae Hendel, 1910 | Aphid flies | 15 | Species | Taxom |
| Chaoboridae Newman, 1834 | Phantom midge | 5 | Species | Taxom |
| Chelisochidae Burr, 1907 | Black earwig | 3 | Species | Taxom |
| Chelonariidae Blanchard, 1845 | Chelonarid beetles | 2 | Species | Taxom |
| Chironomidae Erichson, 1842 | Chironomids | 557 | Species | Taxom |
| Chlorocyphidae Cowley, 1937 | Jewel damselfly | 40 | Species | Taxom |
| Chlorogomphidae Needham, 1903 | | 13 | Species | Taxom |
| Chlorolestidae (Fraser, 1960) | | 10 | Species | Taxom |
| Chloroperlidae Okamoto, 1912 | Green stoneflies | 12 | Species | Taxom |
| Chloropidae Schoenherr, 1840 | Chloropid flies | 277 | Species | Taxom |
| Choreutidae Stainton, 1854 | Choreuitid Moths | 71 | Species | Taxom |
| Chorotypidae Stål, 1873 | | 18 | Species | Taxom |
| Chresmodidae Haase, 1890 | | 1 | Species | Taxom |
| Chrysididae Latreille, 1802 | Chrysidid wasps | 35 | Species | Taxom |
| Chrysomelidae Latreille, 1802 | Casebearers | 2064 | Species | Taxom |
| Chrysopidae Schneider, 1851 | And Green Lacewings | 28 | Species | Taxom |
| Chyromyidae Hendel, 1916 | Chiromyid flies | 0 | Species | Taxom |
| Cicadellidae Latreille, 1802 | Cicadellids | 2298 | Species | Taxom |
| Cicadidae Westwood, 1840 | Cicada | 1202 | Species | Taxom |
| Ciidae Leach, 1819 | Minute tree fungus beetles | 17 | Species | Taxom |
| Cimbicidae Kirby, 1837 | Cimbicid sawflies | 5 | Species | Taxom |
| Cimicidae Latreille, 1802 | Bat bugs | 36 | Species | Taxom |
| Cixiidae Spinola, 1839 | Cixid planthoppers | 113 | Species | Taxom |
| Clambidae Fischer, 1821 | Fringe-winged beetles | 18 | Species | Taxom |
| Cleridae Latreille, 1802 | Checkered Beetle | 56 | Species | Taxom |
| Clusiidae Schönherr, 1840 | Clusiid flies | 3 | Species | Taxom |
| Coccidae Stephens, 1829 | Soft scale | 354 | Species | Taxom |
| Coccinellidae Latreille, 1807 | Coccinelles | 600 | Species | Taxom |
| Coelostomidiidae Morrison, 1928 | | 2 | Species | Taxom |
| Coenagrionidae Kirby, 1890 | Narrow-winged damselflies | 99 | Species | Taxom |
| Coleophoridae Hübner, 1825 | Case moths | 190 | Species | Taxom |
| Colletidae Lepeletier, 1841 | Colletid bees | 46 | Species | Taxom |
| Colobathristidae Stål, 1866 | | 1 | Species | Taxom |
| Conchaspididae Green, 1896 | False armored scales | 6 | Species | Taxom |
| Coniopterygidae Burmeister, 1839 | Dusty lacewings | 14 | Species | Taxom |
| Conopidae Latreille, 1802 | Thick-headed Flies | 72 | Species | Taxom |
| Copromorphidae Meyrick, 1905 | Fig Borers | 5 | Species | Taxom |
| Coptopsyllidae Wagner, 1928 | | 4 | Species | Taxom |
| Cordulegastridae Calvert, 1893 | Biddie | 14 | Species | Taxom |
| Corduliidae Selys-Longch..., 1850 | Baskettails | 54 | Species | Taxom |
| Coreidae Leach, 1815 | Broad-headed bugs | 643 | Species | Taxom |
| Corioxenidae Kinzelbach, 1970 | | 12 | Species | Taxom |
| Corixidae Leach, 1815 | Lesser Water-Boatman | 81 | Species | Taxom |
| Corydalidae Burmeister, 1839 | Dobsonflies | 9 | Species | Taxom |
| Corydiidae de Saussure, 1864 | Sand cockroaches | 110 | Species | Taxom |
| Corylophidae LeConte, 1852 | Hooded beetles | 2 | Species | Taxom |
| Cosmopterigidae Heinemann & ..., 1876 | Cosmet Moths | 266 | Species | Taxom |
| Cossidae Leach, 1815 | Borers | 206 | Species | Taxom |
| Crabronidae Latreille, 1802 | Bee Wolves | 1993 | Species | Taxom |
| Crambidae Latreille, 1810 | Crambid Snout Moths | 1562 | Species | Taxom |
| Cratovitismidae Bechly, 2007 | | 7 | Species | Taxom |
| Cretostylopidae Grimalid & K..., 2005 | | 1 | Species | Taxom |
| Cryptocercidae Handlirsch, 1925 | Brown-hooded cockroaches | 7 | Species | Taxom |
| Cryptochetidae Brues & Mela..., 1932 | Cryptochetid Flies | 3 | Species | Taxom |
| Cryptococcidae | | 4 | Species | Taxom |
| Cryptophagidae Kirby, 1937 | Mould beetles | 21 | Species | Taxom |
| Ctenophthalmidae Rothschild, 1915 | | 31 | Species | Taxom |
| Ctenuchidae (W. Kirby, 1837) | Ctenuchid moths | 0 | Species | Taxom |
| Cucujidae Latreille, 1802 | Flat bark beetles | 55 | Species | Taxom |
| Culicidae Meigen, 1818 | Mosquito | 1235 | Species | Taxom |
| Cupedidae Laporte, 1836 | Cupedids | 16 | Species | Taxom |
| Curculionidae Latreille, 1802 | Ambrosia beetles | 1763 | Species | Taxom |
| Curtonotidae Duda, 1934 | Curtonotid flies | 6 | Species | Taxom |
| Cydnidae Billberg, 1820 | Burrower bugs | 11 | Species | Taxom |
| Cylindrotomidae (Mulsant, 1842) | Cylindrotomid Crane Flies | 3 | Species | Taxom |
| Cymidae Baerensprung, 1860 | | 6 | Species | Taxom |
| Cynipidae Latreille, 1802 | Cynipid gall wasps | 7 | Species | Taxom |
| Cypselosomatidae Hennig, 1958 | Cypselosomatid flies | 2 | Species | Taxom |
| Dactylopiidae Signoret, 1875 | Cochineal insects | 6 | Species | Taxom |
| Danaidae (Boisduval, 1833) | Milkweed Butterflies | 1 | Species | Taxom |
| Dascillidae Guérin-Ménev..., 1843 | Orchid beetles | 9 | Species | Taxom |
| Dasydemellidae | Shaggy Psocids | 1 | Species | Taxom |
| Decliniidae Nikitsky, La..., 1994 | Declinia relicta | 1 | Species | Taxom |
| Delphacidae Leach, 1815 | Delphacid planthoppers | 681 | Species | Taxom |
| Derbidae Spinola, 1839 | Derbid planthoppers | 63 | Species | Taxom |
| Dericorythidae Jacobson & B..., 1902 | | 27 | Species | Taxom |
| Dermestidae Hope, 1840 | Carpet beetles | 141 | Species | Taxom |
| Derodontidae LeConte, 1861 | Tooth-neck fungus beetles | 5 | Species | Taxom |
| Deuterophlebiidae Edwards, 1922 | Mountain midges | 4 | Species | Taxom |
| Diapheromeridae Rehn & Hebard, 1909 | Diapheromerid Stick Insects | 90 | Species | Taxom |
| Diapriidae Latreille, 1796 | Diapriid wasps | 3 | Species | Taxom |
| Diaspididae Maskell, 1878 | Armored scale insects | 436 | Species | Taxom |
| Diastatidae Hendel, 1917 | Bog flies | 10 | Species | Taxom |
| Dictyopharidae Spinola, 1839 | Dictyopharid Planthoppers | 70 | Species | Taxom |
| Dilaridae Newman, 1853 | Pleasing lacewing | 54 | Species | Taxom |
| Dinidoridae Stål, 1867 | Dinidorid bug | 58 | Species | Taxom |
| Diopsidae Billberg, 1820 | Stalk-eyed flies | 10 | Species | Taxom |
| Diplatyidae (Verhoeff, 1902) | | 7 | Species | Taxom |
| Diprionidae Rohwer, 1911 | Conifer sawflies | 5 | Species | Taxom |
| Dipseudopsidae Ulmer, 1904 | | 55 | Species | Taxom |
| Dipsocoridae Dohrn, 1859 | Dipsocorids | 7 | Species | Taxom |
| Discolomatidae Horn, 1878 | | 21 | Species | Taxom |
| Dixidae Schiner, 1868 | Dixid Midges | 26 | Species | Taxom |
| Dolabellopsocidae Eertmoed, 1973 | | 1 | Species | Taxom |
| Dolichopodidae Latreille, 1809 | Long legged flies | 335 | Species | Taxom |
| Douglasiidae Heinemann & ..., 1876 | Douglas Moths | 2 | Species | Taxom |
| Drepanidae Meyrick, 1895 | Drepanids | 163 | Species | Taxom |
| Drilidae (Blanchard, 1845) | Drilid beetles | 1 | Species | Taxom |
| Drosophilidae Rondani, 1856 | Fruit flies | 446 | Species | Taxom |
| Dryinidae Haliday, 1840 | Dryinid wasps | 13 | Species | Taxom |
| Dryomyzidae Schiner, 1862 | Dryomyzid flies | 4 | Species | Taxom |
| Dryopidae Billberg, 1820 | Long toed water beetle | 37 | Species | Taxom |
| Dudgeoneidae Berger, 1958 | Dudgeon Carpenterworm Moths | 1 | Species | Taxom |
| Dytiscidae Leach, 1815 | Diving beetles | 996 | Species | Taxom |
| Ecnomidae Ulmer, 1903 | | 125 | Species | Taxom |
| Ectobiidae (Brunner von ..., 1865) | Wood cockroaches | 63 | Species | Taxom |
| Ectopsocidae | Outer Barklice | 21 | Species | Taxom |
| Elachistidae Bruand, 1851 | Elachistid moths | 159 | Species | Taxom |
| Elateridae Leach, 1815 | Click Beetle | 981 | Species | Taxom |
| Elenchidae Perkins, 1905 | | 6 | Species | Taxom |
| Elipsocidae Pearman, 1936 | Damp Barklice | 5 | Species | Taxom |
| Elmidae Curtis, 1830 | Drive beetles | 535 | Species | Taxom |
| Embiidae Burmeister, 1839 | | 12 | Species | Taxom |
| Empididae Latreille, 1809 | Balloon flies | 104 | Species | Taxom |
| Empusidae Burmeister, 1838 | Violin mantises | 5 | Species | Taxom |
| Encyrtidae Walker, 1837 | Encyrtid wasps | 445 | Species | Taxom |
| Enderleinellidae Ewing, 1929 | | 15 | Species | Taxom |
| Endomychidae Leach, 1815 | False Ladybirds | 126 | Species | Taxom |
| Endromidae Boisduval, 1828 | Glory Moths | 1 | Species | Taxom |
| Eneopteridae (Saussure, 1893) | Bush cricket | 4 | Species | Taxom |
| Enicocephalidae Stål, 1860 | Gnat bug | 39 | Species | Taxom |
| Ensiferoblattidae Li and Huang, 2023 | | 1 | Species | Taxom |
| Epermeniidae Spuler, 1910 | Epermeniid moths | 25 | Species | Taxom |
| Ephemerellidae (Klapálek, 1909) | Blue-Winged Olive Ephemerellidae | 25 | Species | Taxom |
| Ephemeridae Leach, 1817 | Burrowing mayflies | 12 | Species | Taxom |
| Ephialtitidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Ephydridae Zetterstedt, 1837 | Brine flies | 130 | Species | Taxom |
| Epicopeiidae Swinhoe, 1892 | Oriental Swallowtail Moths | 4 | Species | Taxom |
| Epiophlebiidae Muttkowski, 1911 | | 1 | Species | Taxom |
| Epipsocidae | Elliptical bark louse | 12 | Species | Taxom |
| Epipyropidae Dyar, 1903 | Planthopper Parasite Moths | 7 | Species | Taxom |
| Erebidae Leach, 1815 | Erebid Moths | 2370 | Species | Taxom |
| Eremiaphilidae Wood-Mason, 1889 | | 5 | Species | Taxom |
| Eriococcidae Cockerell, 1899 | Eriococcid scales | 90 | Species | Taxom |
| Eriocottidae Spuler, 1898 | Old World Spiny Winged Moths | 16 | Species | Taxom |
| Eriocraniidae Rebel, 1901 | Eriocraniid moths | 4 | Species | Taxom |
| Erotylidae Latreille, 1802 | Pleasing Fungus Beetle | 13 | Species | Taxom |
| Eucharitidae Latreille, 1809 | Eucharitid wasp | 31 | Species | Taxom |
| Eucinetidae Lacordaire, 1857 | Plate-thigh beetle | 4 | Species | Taxom |
| Eucnemidae Eschscholtz, 1829 | Click Beetles | 1 | Species | Taxom |
| Eulichadidae Crowson, 1973 | Forest stream beetle | 3 | Species | Taxom |
| Eulophidae Westwood, 1829 | Eulophid wasps | 338 | Species | Taxom |
| Eumastacidae Burr, 1898 | Matchstick grasshoppers | 19 | Species | Taxom |
| Eupelmidae Walker, 1833 | Eupelmid wasps | 56 | Species | Taxom |
| Euphaeidae Jacobson & B..., 1905 | Gossamerwings | 28 | Species | Taxom |
| Eupterotidae Swinhoe, 1892 | Giant Lappet Moths | 74 | Species | Taxom |
| Eurybrachidae Stål, 1862 | | 26 | Species | Taxom |
| Euryptilonidae Martynov, 1940 | | 1 | Species | Taxom |
| Eurytomidae Walker, 1832 | Eurytomid wasps | 168 | Species | Taxom |
| Euteliidae Grote, 1882 | Euteliid Moths | 58 | Species | Taxom |
| Evaniidae Latreille, 1802 | Ensign wasp | 131 | Species | Taxom |
| Fanniidae Schnabl & Dz..., 1911 | Latrine flies | 14 | Species | Taxom |
| Fergusoninidae Hennig, 1958 | | 1 | Species | Taxom |
| Figitidae Thomson, 1862 | Figitid wasps | 5 | Species | Taxom |
| Flatidae Spinola, 1839 | Flatid planthoppers | 74 | Species | Taxom |
| Forficulidae Stephens, 1829 | Common Earwig | 13 | Species | Taxom |
| Formicidae Latreille, 1809 | Ants | 1464 | Species | Taxom |
| Fractaliidae Vrsansky and..., 2021 | | 1 | Species | Taxom |
| Fulgoridae Latreille, 1807 | Fulgorid Planthopper | 65 | Species | Taxom |
| Gasteruptiidae Ashmead, 1900 | Carrot Wasps | 3 | Species | Taxom |
| Gelastocoridae Kirkaldy, 1897 | Toad bug | 17 | Species | Taxom |
| Gelechiidae Stainton, 1854 | Gelechiid moths | 771 | Species | Taxom |
| Geocoridae Baerensprung, 1860 | Big-eyed Bugs | 31 | Species | Taxom |
| Geometridae Leach, 1815 | Cankerworm moths | 3293 | Species | Taxom |
| Georyssidae Laporte, 1819 | Minute mud-loving beetles | 1 | Species | Taxom |
| Geotrupidae Latreille, 1802 | Dor beetles | 140 | Species | Taxom |
| Gerridae Leach, 1815 | Jesus bugs | 478 | Species | Taxom |
| Glaphyridae MacLeay, 1819 | Bumble bee scarab beetle | 4 | Species | Taxom |
| Glaresidae Kolbe, 1905 | Enigmatic scarab beetle | 1 | Species | Taxom |
| Glossosomatidae Wallengren, 1891 | Little Black Caddisflies | 151 | Species | Taxom |
| Glyphipterigidae Stainton, 1854 | Glyphipterigid moths | 37 | Species | Taxom |
| Goeridae Ulmer, 1903 | | 125 | Species | Taxom |
| Gomphidae Rambur, 1842 | Club-tailed dragonflies | 125 | Species | Taxom |
| Gracillariidae Stainton, 1854 | Blotch leaf miner moths | 363 | Species | Taxom |
| Gryllacrididae Blanchard, 1845 | Camel Crickets | 78 | Species | Taxom |
| Gryllidae Bolivar, 1878 | Crickets | 237 | Species | Taxom |
| Grylloblattidae E. M. Walker, 1914 | Grylloblattids | 15 | Species | Taxom |
| Gryllotalpidae Saussure, 1870 | Mole cricket | 16 | Species | Taxom |
| Gyrinidae Latreille, 1802 | Whirligig beetle | 43 | Species | Taxom |
| Haematopinidae Enderlein, 1904 | Ungulate lice | 10 | Species | Taxom |
| Halictidae Thomson, 1869 | Flower bees | 944 | Species | Taxom |
| Halictophagidae Perkins, 1905 | | 67 | Species | Taxom |
| Halimococcidae Brown & McKe..., 1962 | Halimococcids | 6 | Species | Taxom |
| Haliplidae Aubé, 1836 | Crawling Water Beetle | 48 | Species | Taxom |
| Hamophthiriidae Johnson, 1969 | | 1 | Species | Taxom |
| Hebridae Amyot and Se..., 1843 | Velvet water bug | 103 | Species | Taxom |
| Heleomyzidae (Westwood, 1840) | Heleomyzid flies | 24 | Species | Taxom |
| Heliconiidae (Swainson, 1822) | Heliconians | 3 | Species | Taxom |
| Helicopsychidae Ulmer, 1912 | Snail Case caddisflies | 58 | Species | Taxom |
| Heliodinidae Heinemann & ..., 1876 | Heliodinid moths | 5 | Species | Taxom |
| Heliozelidae Heinemann & ..., 1876 | Leaf miners | 10 | Species | Taxom |
| Helophoridae (Leach, 1815) | Water scavenger beetles | 1 | Species | Taxom |
| Helotidae Reitter, 1876 | | 24 | Species | Taxom |
| Helotrephidae Esaki & China, 1927 | Beetle backswimmers | 158 | Species | Taxom |
| Hemerobiidae Latreille, 1802 | Brown Lacewing | 22 | Species | Taxom |
| Hemipsocidae Pearman, 1936 | Leaf Litter Barklice | 4 | Species | Taxom |
| Hepialidae Stephens, 1829 | Ghost Moths | 211 | Species | Taxom |
| Heptageniidae Needham, 1901 | Flat-Bodied Up-Wings Heptageniidae | 15 | Species | Taxom |
| Hermatobatidae Coutière and..., 1901 | Seabugs | 4 | Species | Taxom |
| Hesperiidae Latreille, 1809 | Skipper | 679 | Species | Taxom |
| Heteroceridae MacLeay, 1825 | Mud beetles | 54 | Species | Taxom |
| Heterocheilidae Mcalpine, 1991 | Half-bridge flies | 0 | Species | Taxom |
| Heterogastridae Stål, 1872 | | 11 | Species | Taxom |
| Heteronemiidae Rehn, J. A. G., 1904 | | 1 | Species | Taxom |
| Heteropterygidae Kirby, 1896 | | 1 | Species | Taxom |
| Himantopteridae Rogenhofer, 1884 | Long Tailed Burnet Moths | 1 | Species | Taxom |
| Hippoboscidae Samouelle, 1819 | Keds | 78 | Species | Taxom |
| Histeridae Gyllenhal, 1808 | Clown beetle | 1217 | Species | Taxom |
| Hodotermitidae Desneux, 1904 | Harvester termites | 7 | Species | Taxom |
| Homotomidae Heslop-Harrison, 1958 | | 12 | Species | Taxom |
| Hoplopleuridae Ewing, 1929 | | 52 | Species | Taxom |
| Hyblaeidae Hampson, 1903 | Teak Moths | 4 | Species | Taxom |
| Hybosoridae Erichson, 1847 | Pill scarab beetles | 39 | Species | Taxom |
| Hybotidae Meigen, 1820 | Dance flies | 120 | Species | Taxom |
| Hydraenidae Mulsant, 1844 | Cascade Beetles | 293 | Species | Taxom |
| Hydrobiosidae Ulmer, 1905 | | 191 | Species | Taxom |
| Hydrometridae Billberg, 1820 | Marsh treader | 41 | Species | Taxom |
| Hydrophilidae Latreille, 1802 | Silver Water Beetles | 556 | Species | Taxom |
| Hydropsychidae Curtis, 1835 | Net Spinning caddisflies | 518 | Species | Taxom |
| Hydroptilidae Stephens, 1836 | Micro caddisflies | 926 | Species | Taxom |
| Hydroscaphidae LeConte, 1874 | Skiff beetle | 7 | Species | Taxom |
| Hygrobiidae Régimbart, 1878 | Screech beetles | 1 | Species | Taxom |
| Hymenopodidae Giglio-Tos, 1919 | Flower mimic mantises | 49 | Species | Taxom |
| Hypsipterygidae Drake, 1961 | | 2 | Species | Taxom |
| Hystrichopsyllidae Tiraboschi, 1904 | Insectivore fleas | 1 | Species | Taxom |
| Ibaliidae Thomson, 1862 | Ibaliid wasps | 13 | Species | Taxom |
| Ichneumonidae Latreille, 1802 | Ichneumon flies | 164 | Species | Taxom |
| Ignotingidae Zhang, Golub..., 2005 | | 1 | Species | Taxom |
| Immidae Heppner, 1977 | Imma Moths | 30 | Species | Taxom |
| Incurvariidae Spuler, 1898 | Fairy moths | 5 | Species | Taxom |
| Indotermitidae (Roonwal, 1958) | | 3 | Species | Taxom |
| Iridopterygidae Giglio-Tos, 1919 | | 19 | Species | Taxom |
| Ischnopsyllidae Wahlgren, 1907 | Bat fleas | 9 | Species | Taxom |
| Isostictidae Fraser, 1955 | Narrow-wings | 1 | Species | Taxom |
| Issidae Spinola, 1839 | Issid planthoppers | 49 | Species | Taxom |
| Jacobsoniidae Heller, 1926 | Jacobson's beetles | 8 | Species | Taxom |
| Kalotermitidae Froggatt, 1897 | Dampwood termites | 66 | Species | Taxom |
| Kermesidae Signoret, 1875 | Gall-like Scale Insects | 34 | Species | Taxom |
| Keroplatidae Rondani, 1856 | Fungus gnats | 63 | Species | Taxom |
| Kerriidae Lindinger, 1937 | Lac Insects | 5 | Species | Taxom |
| Kinnaridae Muir, 1925 | Kinnarid Planthoppers | 10 | Species | Taxom |
| Kozariidae Vea & Grimaldi, 2015 | | 2 | Species | Taxom |
| Kuwaniidae MacGillvray, 1921 | | 3 | Species | Taxom |
| Labiduridae Verhoeff, 1902 | Long-horned earwig | 5 | Species | Taxom |
| Labiidae (Burr, 1909) | Little earwig | 15 | Species | Taxom |
| Lachesillidae Pearman, 1936 | Fateful Barklice | 6 | Species | Taxom |
| Lacturidae Heppner, 1995 | Australian burnet moths | 12 | Species | Taxom |
| Laemobothriidae Mjöberg, 1910 | | 0 | Species | Taxom |
| Laemophloeidae (Ganglbauer, 1899) | Lined flat bark beetles | 16 | Species | Taxom |
| Lampyridae Latreille, 1817 | Fireflies | 865 | Species | Taxom |
| Largidae Amyot and Se..., 1843 | Bordered plant bugs | 69 | Species | Taxom |
| Lasiocampidae Harris, 1841 | Eggar Moths | 119 | Species | Taxom |
| Latridiidae Erichson, 1842 | Minute brown scavenger beetle | 59 | Species | Taxom |
| Lauxaniidae Macquart, 1835 | Beach flies | 61 | Species | Taxom |
| Lecanodiaspididae Borchsenius, 1965 | False pit scales | 30 | Species | Taxom |
| Lecithoceridae Le Marchand, 1947 | Long-horned moths | 174 | Species | Taxom |
| Leiodidae Fleming, 1821 | Round fungus beetles | 451 | Species | Taxom |
| Lepiceridae Hinton, 1936 | | 1 | Species | Taxom |
| Lepidopsocidae Lienhard & S..., 2002 | Scaly-winged bark louse | 23 | Species | Taxom |
| Lepidostomatidae Ulmer, 1903 | Bizarre Caddisflies | 271 | Species | Taxom |
| Lepismatidae Latreille, 1802 | Lepismatid Fishmoths | 16 | Species | Taxom |
| Leptoceridae Leach, 1815 | Long Horned caddisflies | 779 | Species | Taxom |
| Leptohyphidae Landa & Soldán, 1985 | Little Stout Crawler Mayflies | 0 | Species | Taxom |
| Leptophlebiidae Banks, 1900 | Leptophlebiids | 33 | Species | Taxom |
| Leptopodidae Amyot and Se..., 1843 | Spiny shore bugs | 18 | Species | Taxom |
| Leptopsyllidae Rothschild &..., 1915 | Bird fleas | 30 | Species | Taxom |
| Lestidae Calvert, 1901 | Spread-winged damselflies | 41 | Species | Taxom |
| Leucospidae Fabricius, 1775 | Leucospid wasps | 15 | Species | Taxom |
| Leuctridae Klapálek, 1905 | Needle Or Willow Stoneflies | 17 | Species | Taxom |
| Libellulidae Rambur, 1842 | Chasers | 139 | Species | Taxom |
| Liberiblattinidae Vrsansky, 2002 | | 7 | Species | Taxom |
| Limacodidae Duponchel, 1845 | Cup moths | 127 | Species | Taxom |
| Limnephilidae Kolenati, 1848 | Northern caddisflies | 192 | Species | Taxom |
| Limnichidae Erichson, 1846 | Minute marsh loving beetle | 126 | Species | Taxom |
| Limnocentropodidae Tsuda, 1942 | | 15 | Species | Taxom |
| Limoniidae (Speiser, 1909) | Craneflies | 159 | Species | Taxom |
| Linognathidae Webb, 1946 | | 12 | Species | Taxom |
| Liopteridae Ashmead, 1895 | Liopterid wasps | 1 | Species | Taxom |
| Liposcelididae Enderlein, 1911 | Booklice | 16 | Species | Taxom |
| Liturgusidae Giglio-Tos, 1919 | | 8 | Species | Taxom |
| Liviidae Low, 1879 | | 52 | Species | Taxom |
| Lonchaeidae Loew, 1861 | Lance Flies | 20 | Species | Taxom |
| Lonchodidae | | 1 | Species | Taxom |
| Lonchopteridae Curtis, 1839 | Pointed-wing flies | 5 | Species | Taxom |
| Lophopidae Stål, 1866 | | 13 | Species | Taxom |
| Lucanidae Latreille, 1804 | Stag Beetle | 396 | Species | Taxom |
| Lutrochidae Kasap & Crowson, 1975 | Robust marsh loving beetle | 1 | Species | Taxom |
| Lycaenidae Leach, 1815 | Blue butterflies | 1164 | Species | Taxom |
| Lycidae Laporte, 1836 | Lycid beetles | 87 | Species | Taxom |
| Lygaeidae Schilling, 1829 | Chinch bugs | 151 | Species | Taxom |
| Lymexylidae Fleming, 1821 | Ship-timber beetle | 27 | Species | Taxom |
| Lyonetiidae Stainton, 1854 | Lyonet Moths | 42 | Species | Taxom |
| Machaerotidae Stål, 1866 | Tube spittlebugs | 24 | Species | Taxom |
| Machilidae Grassi, 1888 | Jumping bristletail | 11 | Species | Taxom |
| Macrodrilidae Poinar, 2020 | | 1 | Species | Taxom |
| Malcidae Stål, 1865 | | 30 | Species | Taxom |
| Manipulatoridae Vrsansky & B..., 2015 | | 2 | Species | Taxom |
| Mantidae Burmeister, 1838 | Mantids | 130 | Species | Taxom |
| Mantispidae Leach, 1815 | Mantid lacewings | 125 | Species | Taxom |
| Margarodidae Newstead, 1901 | Cottony cushion scales | 15 | Species | Taxom |
| Mastacideidae Rehn, 1948 | | 8 | Species | Taxom |
| Matsucoccidae Morrison, 1927 | Pine bark scales | 9 | Species | Taxom |
| Meenoplidae Fieber, 1872 | | 13 | Species | Taxom |
| Megachilidae Schenk, 1860 | And Resin Bees | 730 | Species | Taxom |
| Megalodontesidae Konow, 1897 | | 0 | Species | Taxom |
| Megalopodidae Latreille, 1802 | Megalopodid Leaf Beetles | 129 | Species | Taxom |
| Megamerinidae Hendel, 1913 | Megamerinid flies | 1 | Species | Taxom |
| Megapodagrionidae Tillyard, 1917 | Flatwing | 3 | Species | Taxom |
| Megaspilidae Ashmead, 1893 | Megaspilid wasps | 2 | Species | Taxom |
| Meinertellidae Verhoeff, 1910 | Hump-backed Bristletails | 2 | Species | Taxom |
| Melandryidae Leach, 1815 | False Darkling Beetle | 29 | Species | Taxom |
| Melanthripidae Bagnall, 1913 | | 3 | Species | Taxom |
| Melittidae Schenk, 1860 | Melittid bees | 32 | Species | Taxom |
| Meloidae Gyllenhal, 1810 | Blister Beetle | 273 | Species | Taxom |
| Melolonthidae (Leach, 1817) | Chafers | 14 | Species | Taxom |
| Melyridae Leach, 1815 | Malachite Beetles | 13 | Species | Taxom |
| Membracidae Germar, 1821 | Horned Treehoppers | 348 | Species | Taxom |
| Mengenillidae Kinzelbach, 1970 | | 2 | Species | Taxom |
| Menoponidae Mjöberg, 1910 | Bird lice | 22 | Species | Taxom |
| Meropeidae Espen-Petersen, 1921 | Earwig-flies | 1 | Species | Taxom |
| Merothripidae Hood, 1914 | Large-legged thrips | 4 | Species | Taxom |
| Mesoblattinidae Handlirsch, 1906 | | 10 | Species | Taxom |
| Mesopsocidae Enderlein, 1903 | Middle Barklice | 3 | Species | Taxom |
| Mesoveliidae Douglas and ..., 1867 | Pond treaders | 20 | Species | Taxom |
| Metallyticidae Handlirsch, 1925 | | 1 | Species | Taxom |
| Micronectidae Jaczewski, 1924 | Pygmy water boatmen | 92 | Species | Taxom |
| Micronoctuidae Fibiger, 2005 | | 19 | Species | Taxom |
| Micropezidae Illiger, 1798 | Stilt Flies | 23 | Species | Taxom |
| Microphysidae Dohrn, 1859 | Microphysid bugs | 1 | Species | Taxom |
| Micropterigidae Herrich-Schä..., 1855 | Mandibulate Archaic Moths | 4 | Species | Taxom |
| Microthoraciidae Kim and Ludwig, 1978 | | 1 | Species | Taxom |
| Milichiidae Schiner, 1862 | Filth flies | 13 | Species | Taxom |
| Miridae Hahn, 1831 | Capsid bugs | 463 | Species | Taxom |
| Mogoplistidae Saussure, 1877 | Scaly cricket | 24 | Species | Taxom |
| Molannidae Wallengren, 1891 | Hood Casemaker Caddisflies | 17 | Species | Taxom |
| Monophlebidae Signoret, 1875 | Giant scale | 96 | Species | Taxom |
| Monotomidae Laporte, 1840 | Minute Clubbed Beetles | 39 | Species | Taxom |
| Mordellidae Latreille, 1802 | Pintail beetles | 66 | Species | Taxom |
| Muscidae Latreille, 1802 | Face flies | 438 | Species | Taxom |
| Mutillidae André, 1907 | Cow ant | 19 | Species | Taxom |
| Mycetophagidae Leach, 1815 | Hairy fungus beetle | 11 | Species | Taxom |
| Mycetophilidae Newman, 1834 | Fungus Gnat | 301 | Species | Taxom |
| Mycteridae Blanchard, 1845 | Mycterid beetles | 4 | Species | Taxom |
| Mydidae Bezzi, 1903 | Mydas flies | 16 | Species | Taxom |
| Mymaridae Haliday, 1833 | Fairflies | 102 | Species | Taxom |
| Mymarommatidae Debauche, 1948 | False fairy wasp | 4 | Species | Taxom |
| Myopsocidae Enderlein, 1907 | Mouse like barklouse | 7 | Species | Taxom |
| Myrmecolacidae Saunders, 1872 | | 46 | Species | Taxom |
| Myrmecophilidae Saussure, 1874 | Ant cricket | 13 | Species | Taxom |
| Myrmeleontidae Latreille, 1802 | Ant lions | 361 | Species | Taxom |
| Myrmosidae Fox, 1894 | Myrmosid Wasps | 2 | Species | Taxom |
| Mythicomyiidae Melander, 1902 | Micro Bee Flies | 4 | Species | Taxom |
| Nabidae Costa, 1852 | Damsel bugs | 12 | Species | Taxom |
| Naucoridae Leach, 1815 | Creeping water bug | 88 | Species | Taxom |
| Nemestrinidae Macquart, 1834 | Tangle-veined flies | 10 | Species | Taxom |
| Nemopteridae Rambur, 1842 | Spoonwings | 4 | Species | Taxom |
| Nemouridae Newman, 1853 | Brown stoneflies | 118 | Species | Taxom |
| Neoephemeridae Traver, 1935 | Large square-gilled mayflies | 1 | Species | Taxom |
| Nepidae Latreille, 1802 | Back-swimmer Water-boatmen | 70 | Species | Taxom |
| Nepticulidae Stainton, 1854 | Leaf miners | 57 | Species | Taxom |
| Neriidae Hendel, 1916 | Banana stalk flies | 6 | Species | Taxom |
| Nicoletiidae Escherich, 1905 | Nicoletiid Fishmoths | 2 | Species | Taxom |
| Ninidae Barber, 1956 | | 4 | Species | Taxom |
| Nitidulidae Latreille, 1802 | Nitidules | 79 | Species | Taxom |
| Nocticolidae Bolivar, 1892 | Australian cockroaches | 48 | Species | Taxom |
| Nocticolinae | | 22 | Species | Taxom |
| Noctuidae Latreille, 1809 | Armyworms | 1409 | Species | Taxom |
| Nogodinidae Melichar, 1898 | | 13 | Species | Taxom |
| Nolidae Hampson, 1894 | Hatted Caterpillars | 273 | Species | Taxom |
| Nosodendridae Erichson, 1846 | Nosodendrid beetles | 34 | Species | Taxom |
| Noteridae C. G. Thomson, 1860 | Burrowing water beetle | 46 | Species | Taxom |
| Nothybidae Frey, 1927 | | 1 | Species | Taxom |
| Notodontidae Stephens, 1829 | Bag Shelter Moths | 351 | Species | Taxom |
| Notonectidae Latreille, 1802 | Back Swimmers | 121 | Species | Taxom |
| Nycteribiidae Samouelle, 1819 | Bat Flies | 6 | Species | Taxom |
| Nymphalidae Rafinesque, 1815 | Admirals | 1365 | Species | Taxom |
| Nymphomyiidae Tokunaga, 1932 | Nymphomyiid crane flies | 1 | Species | Taxom |
| Ochodaeidae Mulsant & Rey, 1870 | Sand-loving scarab beetle | 8 | Species | Taxom |
| Ochteridae Kirkaldy, 1906 | Velvety shore bug | 4 | Species | Taxom |
| Odiniidae Hendel, 1920 | Odiniid flies | 1 | Species | Taxom |
| Odontoceridae Wallengren, 1891 | Mortarjoint Casemaker Caddisflies | 49 | Species | Taxom |
| Oecanthidae (Blanchard, 1845) | Tree cricket | 8 | Species | Taxom |
| Oecophoridae Bruand, 1851 | Concealer Moths | 140 | Species | Taxom |
| Oedemeridae Latreille, 1810 | False Blister Beetle | 62 | Species | Taxom |
| Oestridae Leach, 1815 | Bot flies | 14 | Species | Taxom |
| Olidae Vr?anský & W..., 2017 | | 2 | Species | Taxom |
| Oligoneuriidae Ulmer, 1914 | Brushleg Mayflies | 3 | Species | Taxom |
| Oligotomidae Enderlein, 1909 | | 11 | Species | Taxom |
| Omaniidae Cobben, 1970 | Intertidal dwarf bug | 2 | Species | Taxom |
| Omethidae LeConte, 1861 | False fireflies | 5 | Species | Taxom |
| Ommatidae Sharp & Muir, 1912 | | 1 | Species | Taxom |
| Ommexechidae Bolivar, 1884 | | 1 | Species | Taxom |
| Opomyzidae (Fallen, 1820) | Opomyzid flies | 1 | Species | Taxom |
| Opostegidae Meyrick, 1893 | Opostegid moths | 5 | Species | Taxom |
| Ormyridae Förster, 1856 | Armyrids | 12 | Species | Taxom |
| Orsodacnidae Thomson, 1859 | Orsodacnid Leaf Beetles | 1 | Species | Taxom |
| Ortheziidae Green, 1896 | Ensign coccids | 47 | Species | Taxom |
| Orussidae Newman, 1834 | Orussid wasps | 1 | Species | Taxom |
| Osmylidae Leach, 1815 | Giant lacewings | 3 | Species | Taxom |
| Otitidae (Macquart, 1835) | Picture-winged flies | 11 | Species | Taxom |
| Oxycarenidae Stål, 1862 | | 13 | Species | Taxom |
| Pabuonqedidae Vrsansky et al., 2019 | | 2 | Species | Taxom |
| Pachygronthidae Stål, 1865 | | 6 | Species | Taxom |
| Pachyneuridae Schiner, 1864 | Dark-winged fungus gnats | 1 | Species | Taxom |
| Pachytroctidae Enderlein, 1911 | Thick Barklice | 8 | Species | Taxom |
| Paedembiidae Ross, 2006 | | 1 | Species | Taxom |
| Palaeosetidae Turner, 1922 | Miniature Ghost Moths | 0 | Species | Taxom |
| Pallopteridae Loew, 1862 | Flutter flies | 1 | Species | Taxom |
| Pamphagidae Burmeister, 1840 | Toad grasshopper | 39 | Species | Taxom |
| Pamphiliidae Cameron, 1890 | Leaf-rolling sawflies | 1 | Species | Taxom |
| Panorpidae Linnaeus, 1758 | Common scorpionflies | 483 | Species | Taxom |
| Panorpodidae Byers, 1965 | Short-faced scorpionflies | 21 | Species | Taxom |
| Papilionidae Latreille, 1802 | Apollos | 369 | Species | Taxom |
| Parastrachiidae Oshanin, 1922 | | 0 | Species | Taxom |
| Passalidae Leach, 1815 | Bess beetle | 53 | Species | Taxom |
| Passandridae (Erichson, 1845) | Parasitic flat bark beetle | 1 | Species | Taxom |
| Pediciidae Osten Sacken, 1860 | Hairy-Eyed Crane Flies | 15 | Species | Taxom |
| Pedicinidae Enderlein, 1904 | | 4 | Species | Taxom |
| Pediculidae Leach, 1817 | | 1 | Species | Taxom |
| Pelecinidae Haliday, 1839 | Ancestral And Modern Pelecinid Wasps | 1 | Species | Taxom |
| Peltoperlidae Claassen, 1931 | Roach stoneflies | 5 | Species | Taxom |
| Pentatomidae Leach, 1815 | Lesser shield bugs | 88 | Species | Taxom |
| Perilampidae Latreille, 1809 | Perilampid waps | 27 | Species | Taxom |
| Peripsocidae Roesler, 1944 | Stout Barklice | 16 | Species | Taxom |
| Periscelididae Oldenberg, 1914 | Periscelidid Flies | 3 | Species | Taxom |
| Perlidae (Latreille, 1802) | Common stoneflies | 115 | Species | Taxom |
| Perlodidae Klapálek, 1912 | Perlodid stoneflies | 29 | Species | Taxom |
| Personidae Gray, 1854 | | 5 | Species | Taxom |
| Petaluridae Needham, 1903 | Grayback dragonfly | 1 | Species | Taxom |
| Phacopteronidae Heslop-Harrison, 1958 | | 1 | Species | Taxom |
| Phaeomyiidae (Verbeke, 1950) | Marsh flies | 1 | Species | Taxom |
| Phalacridae Leach, 1815 | Shining flower beetles | 6 | Species | Taxom |
| Phalangopsidae (Chopard, 1949) | Spider cricket | 26 | Species | Taxom |
| Phasmatidae Roberts, 1944 | Walking sticks | 118 | Species | Taxom |
| Phengodidae LeConte, 1861 | Glow-worms | 33 | Species | Taxom |
| Philopotamidae Stephens, 1829 | Finger Net caddisflies | 404 | Species | Taxom |
| Philopteridae Burmeister, 1830 | | 22 | Species | Taxom |
| Philotarsidae Pearman, 1936 | Loving Barklice | 2 | Species | Taxom |
| Phlaeothripidae Uzel, 1895 | Thrips | 419 | Species | Taxom |
| Phoenicococcidae Stickney, 1934 | Palm scales | 1 | Species | Taxom |
| Phoridae Curtis, 1833 | Coffin Flies | 114 | Species | Taxom |
| Phryganeidae (Leach, 1815) | Giant casemaker | 30 | Species | Taxom |
| Phryganopsychidae Wiggins, 1959 | | 3 | Species | Taxom |
| Phylliidae Redtenbacher, 1906 | Leaf insects | 12 | Species | Taxom |
| Phylloxeridae Herrich-Scha..., 1854 | Phylloxeran Aphids | 1 | Species | Taxom |
| Phyloblattidae Schneider, 1983 | | 1 | Species | Taxom |
| Pieridae Duponchel, 1835 | Brimstones | 307 | Species | Taxom |
| Piesmatidae Amyot & Audi..., 1843 | Ash grey leaf bug | 2 | Species | Taxom |
| Piophilidae Macquart, 1835 | Cheese flies | 7 | Species | Taxom |
| Pipunculidae Walker, 1834 | Big headed flies | 98 | Species | Taxom |
| Plataspidae (Dallas, 1851) | | 4 | Species | Taxom |
| Plataspididae (Dallas, 1851) | | 5 | Species | Taxom |
| Platycnemididae Tillyard, 1917 | White-legged damselflies | 31 | Species | Taxom |
| Platygastridae Haliday, 1833 | Platygastrid wasps | 5 | Species | Taxom |
| Platypezidae Fallen, 1815 | Flat footed flies | 11 | Species | Taxom |
| Platystictidae Laidlaw, 1924 | Forest Damselflies | 67 | Species | Taxom |
| Platystomatidae Schiner, 1862 | Picture-winged flies | 72 | Species | Taxom |
| Pleidae Fieber, 1817 | Pigmy backswimmers | 14 | Species | Taxom |
| Pleocomidae LeConte, 1861 | Rain beetle | 1 | Species | Taxom |
| Plutellidae Guenée, 1845 | Diamond-back moths | 30 | Species | Taxom |
| Podabrocephalidae Pic, 1930 | | 1 | Species | Taxom |
| Podoscirtidae Saussure, 1878 | | 59 | Species | Taxom |
| Polycentropodidae Ulmer, 1903 | Tube Maker Caddisflies | 226 | Species | Taxom |
| Polyctenidae Westwood, 1874 | Bat bugs | 6 | Species | Taxom |
| Polymitarcyidae Banks, 1900 | Pale Burrower Mayflies | 4 | Species | Taxom |
| Polyplacidae Fahrenholz, 1912 | Spiny rat lice | 62 | Species | Taxom |
| Pompilidae Latreille, 1805 | Pompilid wasps | 178 | Species | Taxom |
| Potamanthidae Albarda, 1888 | Hacklegill mayflies | 3 | Species | Taxom |
| Prionoceridae Lacaordaire, 1857 | | 6 | Species | Taxom |
| Prionoglarididae Badonnel, 1951 | Large-winged Psocids | 1 | Species | Taxom |
| Prisopodidae Brunner von ..., 1893 | | 3 | Species | Taxom |
| Proctotrupidae Latreille, 1802 | Proctotrupid wasps | 2 | Species | Taxom |
| Prodoxidae Riley, 1881 | Yucca Moths | 5 | Species | Taxom |
| Prophalangopsidae Saussure, 1878 | Grigs | 1 | Species | Taxom |
| Prosopistomatidae Lameere, 1917 | | 4 | Species | Taxom |
| Prostomidae C. G. Thomson, 1859 | Jugular-horned beetle | 6 | Species | Taxom |
| Protogryllidae Zeuner, 1937 | | 1 | Species | Taxom |
| Protoneuridae Tillyard, 1917 | Bambootails | 32 | Species | Taxom |
| Psephenidae Lacordaire, 1854 | Water pennies | 18 | Species | Taxom |
| Pseudocaeciliidae Pearman, 1936 | False Lizard Barklice | 19 | Species | Taxom |
| Pseudococcidae Heymons, 1915 | Mealy Bugs | 176 | Species | Taxom |
| Pseudophasmatidae Kirby, 1896 | Striped Walkingsticks | 2 | Species | Taxom |
| Pseudophyllodromiidae Hebard, 1929 | | 279 | Species | Taxom |
| Pseudostigmatidae Tillyard, 1917 | Forest giants | 1 | Species | Taxom |
| Psilidae Macquart, 1835 | Carrot flies | 31 | Species | Taxom |
| Psocidae Samouelle, 1819 | Common bark louse | 51 | Species | Taxom |
| Psoquillidae Lienhard & S..., 2002 | Bird Nest Barklice | 2 | Species | Taxom |
| Psychidae Boisduval, 1828 | Bagmoths | 113 | Species | Taxom |
| Psychodidae Newman, 1834 | Drain flies | 191 | Species | Taxom |
| Psychomyiidae Walker, 1852 | Net Tube Caddisflies | 210 | Species | Taxom |
| Psyllidae Latreille, 1807 | Jumping plant lice | 95 | Species | Taxom |
| Psyllipsocidae Enderlein, 1903 | Cave Barklice | 6 | Species | Taxom |
| Pterogeniidae Crowson, 1953 | | 3 | Species | Taxom |
| Pterolonchidae Meyrick, 1918 | Lance Wing Moths | 1 | Species | Taxom |
| Pteromalidae Dalman, 1820 | Pteromalid wasps | 182 | Species | Taxom |
| Pteronarcyidae Enderlein, 1909 | Giant stoneflies | 2 | Species | Taxom |
| Pterophoridae Zeller, 1841 | Plume Moths | 293 | Species | Taxom |
| Pteroplistidae (Chopard, 1936) | | 3 | Species | Taxom |
| Pthiridae Leach, 1817 | | 1 | Species | Taxom |
| Ptiliidae Heer, 1843 | Feather-wing beetles | 55 | Species | Taxom |
| Ptilodactylidae Laporte, 1836 | Ptilodactylid beetles | 18 | Species | Taxom |
| Ptinidae Latreille, 1802 | Death-watch and Spider Beetles | 37 | Species | Taxom |
| Ptychopteridae Osten Sacken, 1862 | Phantom crane flies | 5 | Species | Taxom |
| Pulicidae Billberg, 1820 | Cat fleas | 15 | Species | Taxom |
| Putoidae Beardsley, 1969 | Giant mealybugs | 6 | Species | Taxom |
| Pygidicranidae (Verhoeff, 1902) | | 7 | Species | Taxom |
| Pygiopsyllidae Wagner, 1939 | | 4 | Species | Taxom |
| Pyralidae Latreille, 1802 | Flour Moths | 499 | Species | Taxom |
| Pyrgomorphidae Brunner von ..., 1874 | Bushlocusts | 68 | Species | Taxom |
| Pyrgotidae Schiner, 1868 | Light Flies | 19 | Species | Taxom |
| Pyrochroidae Latreille, 1807 | Cardinal beetles | 3 | Species | Taxom |
| Pyrrhocoridae Dohrn, 1859 | Cotton stainers | 9 | Species | Taxom |
| Pythidae Solier, 1834 | Dead log bark beetles | 2 | Species | Taxom |
| Qinococcidae Wu, 2022 | | 10 | Species | Taxom |
| Rangomaramidae Jaschhof & D..., 2002 | | 1 | Species | Taxom |
| Raphidiidae Latreille, 1810 | Raphidiid snakeflies | 1 | Species | Taxom |
| Raphidiomimidae Vishniakova, 1973 | | 1 | Species | Taxom |
| Ratemiidae Kim and Ludwig, 1978 | | 1 | Species | Taxom |
| Reduviidae Latreille, 1807 | Assassin and thread-legged bugs | 2113 | Species | Taxom |
| Rhagionidae Latreille, 1802 | Snipe flies | 41 | Species | Taxom |
| Rhagophthalmidae Olivier, 1907 | | 8 | Species | Taxom |
| Rhaphidophoridae Walker, 1869 | And Cave Weta | 17 | Species | Taxom |
| Rhiniidae Brauer & Ber..., 1889 | | 3 | Species | Taxom |
| Rhinophoridae Robineau-Des..., 1863 | Woodlouse flies | 2 | Species | Taxom |
| Rhinotermitidae Froggatt, 1897 | Subterranean termites | 46 | Species | Taxom |
| Rhipiphoridae Gemminger & ..., 1870 | Hump back beetles | 2 | Species | Taxom |
| Rhizoecidae Williams, 1969 | | 15 | Species | Taxom |
| Rhopalidae Amyot & Serv..., 1843 | Rhopalid Bugs | 32 | Species | Taxom |
| Rhopalosomatidae Ashmead, 1896 | Rhopalosomatid wasps | 5 | Species | Taxom |
| Rhyacophilidae Stephens, 1836 | Free-living Caddisflies | 44 | Species | Taxom |
| Rhynchitidae Gistel, 1848 | Leaf-rolling weevils | 8 | Species | Taxom |
| Rhyparochromidae Amyot & Serv..., 1843 | Dirt-colored Seed Bugs | 163 | Species | Taxom |
| Ricaniidae Amyot & Audi..., 1843 | | 45 | Species | Taxom |
| Richardiidae (Snow, 1896) | Picture-winged flies | 1 | Species | Taxom |
| Riodinidae Grote, 1895 | Metalmark Butterflies | 64 | Species | Taxom |
| Ripiphoridae Gemminger & ..., 1870 | Rhipiphoridae | 4 | Species | Taxom |
| Roeslerstammiidae Bruand, 1850 | Double-eye moths | 1 | Species | Taxom |
| Romaleidae Brunner von ..., 1893 | Lubber grasshopper | 2 | Species | Taxom |
| Ropalomeridae Linder, 1930 | Ropalomerid flies | 0 | Species | Taxom |
| Rutelidae (MacLeay, 1819) | | 26 | Species | Taxom |
| Saldidae Amyot and Se..., 1843 | Shore bug | 70 | Species | Taxom |
| Salpingidae Leach, 1815 | Narrow-waisted bark beetle | 28 | Species | Taxom |
| Sarcophagidae Macquart, 1834 | Flesh flies | 149 | Species | Taxom |
| Saturniidae Boisduval, 1837 | And Giant Silk Moths | 118 | Species | Taxom |
| Scarabaeidae Latreille, 1802 | Dung beetles | 3440 | Species | Taxom |
| Scathophagidae Robineau-Des..., 1830 | Dung flies | 14 | Species | Taxom |
| Scatopsidae Newman, 1834 | Dung midges | 24 | Species | Taxom |
| Scelembiidae Ross, 2001 | | 1 | Species | Taxom |
| Scelionidae Haliday, 1839 | Scelionid wasps | 131 | Species | Taxom |
| Scenopinidae Burmeister, 1835 | Window Flies | 5 | Species | Taxom |
| Schizopodidae (LeConte, 1859) | False Jewel Beetles | 1 | Species | Taxom |
| Schizopteridae Reuter, 1891 | Jumping ground bugs | 32 | Species | Taxom |
| Schreckensteiniidae Fletcher, 1929 | Bristle Legged Moths | 1 | Species | Taxom |
| Sciaridae Billberg, 1820 | Black fungus gnats | 4 | Species | Taxom |
| Sciomyzidae Fallen, 1820 | Marsh Flies | 25 | Species | Taxom |
| Scirtidae Fleming, 1821 | Marsh Beetle | 58 | Species | Taxom |
| Sclerogibbidae Ashmead, 1902 | Sclerogibbid wasp | 3 | Species | Taxom |
| Scoliidae Leach, 1815 | Mammoth wasps | 10 | Species | Taxom |
| Scolytidae (Latreille, 1807) | Ambrosia | 2 | Species | Taxom |
| Scraptiidae Mulsant, 1856 | Antlike leaf beetles | 44 | Species | Taxom |
| Scutelleridae Leach, 1815 | Jewel bugs | 28 | Species | Taxom |
| Scydmaenidae (Leach, 1815) | Ant-like stone beetles | 491 | Species | Taxom |
| Scythrididae Rebel, 1901 | Flower Moths | 8 | Species | Taxom |
| Sepsidae Walker, 1833 | Black scavenger flies | 60 | Species | Taxom |
| Sepulcidae Rasnitsyn, 1968 | | 1 | Species | Taxom |
| Serendipidae Evenhuis, 1994 | | 0 | Species | Taxom |
| Sericostomatidae Stephens, 1836 | Bushtailed Caddisflies | 2 | Species | Taxom |
| Sesiidae Boisduval, 1828 | Clear Wings | 103 | Species | Taxom |
| Sialidae Leach, 1815 | Alderflies | 3 | Species | Taxom |
| Signiphoridae Howard, 1894 | Signiphorid waps | 5 | Species | Taxom |
| Silphidae Latreille, 1807 | Burying And Carrion Beetles | 82 | Species | Taxom |
| Silvanidae Kirby, 1837 | Flat bark beetles | 77 | Species | Taxom |
| Simuliidae Newman, 1834 | Black flies | 77 | Species | Taxom |
| Siphlonuridae Banks, 1900 | Primitive Minnow Mayflies | 7 | Species | Taxom |
| Siricidae Billberg, 1820 | Horntail | 5 | Species | Taxom |
| Sphaeritidae Schuckard, 1839 | False clown beetle | 4 | Species | Taxom |
| Sphaeriusidae Erichson, 1845 | Minute Bog Beetles | 5 | Species | Taxom |
| Sphaeroceridae Macquart, 1835 | Dung flies | 127 | Species | Taxom |
| Sphecidae Latreille, 1802 | Digger & Sand wasps | 184 | Species | Taxom |
| Sphindidae Jacquelin du..., 1860 | Cryptic slime mold beetle | 9 | Species | Taxom |
| Sphingidae Latreille, 1802 | Hawk Moths | 381 | Species | Taxom |
| Spiralizoridae Kocarek, Ho..., 2020 | | 1 | Species | Taxom |
| Spongiphoridae Verhoeff, 1902 | Little Earwigs | 4 | Species | Taxom |
| Staphylinidae Lameere, 1900 | Rove beetles | 6259 | Species | Taxom |
| Steingeliidae Morrison, 1927 | | 1 | Species | Taxom |
| Stenopelmatidae Burmeister, 1838 | Bulldog Raspy Crickets | 6 | Species | Taxom |
| Stenopsocidae Pearman, 1936 | Narrow Barklice | 6 | Species | Taxom |
| Stenopsychidae Martynov, 1924 | | 77 | Species | Taxom |
| Stephanidae Leach, 1815 | Crown wasp | 2 | Species | Taxom |
| Stivaliidae Mardon, 1978 | | 2 | Species | Taxom |
| Stratiomyidae Latreille, 1802 | Soldier flies | 152 | Species | Taxom |
| Streblidae (Kolenati, 1863) | Bat flies | 18 | Species | Taxom |
| Strongylophthalmyiidae Hennig, 1940 | Strongylophthalmyiid flies | 2 | Species | Taxom |
| Stylopidae Kirby, 1813 | Strepsiptera | 51 | Species | Taxom |
| Synteliidae Lewis, 1882 | | 1 | Species | Taxom |
| Syrphidae Latreille, 1802 | Drone flies | 539 | Species | Taxom |
| Tabanidae Latreille, 1802 | Breeze flies | 371 | Species | Taxom |
| Tachardiidae Green, 1896 | Lac insects | 49 | Species | Taxom |
| Tachinidae (Robineau-Des..., 1830) | Bristle Flies | 338 | Species | Taxom |
| Taeniopterygidae Klapálek, 1905 | Taeniopterygid winter stoneflies | 12 | Species | Taxom |
| Tanaostigmatidae Howard, 1890 | Tanaostigmatid wasps | 2 | Species | Taxom |
| Tanyderidae Alexander, 1919 | Primitive crane flies | 3 | Species | Taxom |
| Tarachodidae Handlirsch, 1930 | | 15 | Species | Taxom |
| Tenebrionidae Latreille, 1802 | Darkling Beetle | 126 | Species | Taxom |
| Tenthredinidae Latreille, 1804 | Common sawflies | 122 | Species | Taxom |
| Tephritidae Newman, 1834 | Fruit flies | 432 | Species | Taxom |
| Teredidae Seidlitz, 1888 | | 4 | Species | Taxom |
| Termitidae Latreille, 1802 | Higher termites | 274 | Species | Taxom |
| Termopsidae Grassé, 1949 | Damp wood termite | 2 | Species | Taxom |
| Tessaratomidae Stål, 1864 | Giant shield bug | 167 | Species | Taxom |
| Tethinidae (Hendel, 1916) | Tethinid flies | 5 | Species | Taxom |
| Tetracampidae Förster, 1856 | Tetracampid wasps | 6 | Species | Taxom |
| Tetratomidae Billberg, 1820 | Polypore fungus beetle | 11 | Species | Taxom |
| Tetrigidae Rambur, 1838 | Groundhoppers | 244 | Species | Taxom |
| Tettigometridae Germar, 1821 | | 13 | Species | Taxom |
| Tettigoniidae Krauss, 1902 | Bush crickets | 335 | Species | Taxom |
| Thanerocleridae Chapin, 1921 | | 1 | Species | Taxom |
| Thaumaleidae Bezzi, 1913 | Solitary midges | 17 | Species | Taxom |
| Thaumastocoridae Kirkaldy, 1908 | Palm bug | 3 | Species | Taxom |
| Therevidae Newman, 1834 | Stiletto flies | 42 | Species | Taxom |
| Thespidae Giglio-Tos, 1919 | | 5 | Species | Taxom |
| Thripidae Stevens, 1829 | Common thrips | 323 | Species | Taxom |
| Throscidae Laporte, 1840 | False metallic wood-boring beetles | 7 | Species | Taxom |
| Thynnidae Shuckard, 1841 | Thynnid Wasps | 5 | Species | Taxom |
| Thyreocoridae Amyot and Se..., 1843 | Black bugs | 1 | Species | Taxom |
| Thyrididae Herrich-Schä..., 1846 | Picture Winged Leaf Moths | 91 | Species | Taxom |
| Tineidae Latreille, 1810 | & Allies | 414 | Species | Taxom |
| Tingidae Laporte, 1832 | Lace bug | 580 | Species | Taxom |
| Tiphiidae Leach, 1815 | Flower wasps | 50 | Species | Taxom |
| Tipulidae Latreille, 1802 | Crane Flies | 1769 | Species | Taxom |
| Tischeriidae Spuler, 1898 | Lyonetiid moths | 4 | Species | Taxom |
| Tortricidae Latreille, 1803 | Bell Moths | 977 | Species | Taxom |
| Torymidae Walker, 1833 | Apple seed chalcids | 67 | Species | Taxom |
| Toxoderidae Giglio-Tos, 1919 | | 13 | Species | Taxom |
| Trichoceridae Rondani, 1841 | Winter Crane Flies | 25 | Species | Taxom |
| Trichodectidae Kellogg, 1896 | | 10 | Species | Taxom |
| Trichogrammatidae Haliday, 1851 | Trichogrammatid wasps | 105 | Species | Taxom |
| Tricorythidae Lestage, 1942 | Little stout crawler mayflies | 2 | Species | Taxom |
| Trictenotomidae Blanchard, 1845 | Croc beetles | 10 | Species | Taxom |
| Tridactylidae Saussure, 1874 | Pygmy mole cricket | 33 | Species | Taxom |
| Trigonalidae (Cresson, 1887) | Trigonalid sawflies | 3 | Species | Taxom |
| Trigonidiidae (Saussure, 1870) | And Ground Crickets | 65 | Species | Taxom |
| Trigonopterygidae Walker, 1870 | | 1 | Species | Taxom |
| Triozidae Löw, 1879 | Jumping plant lice | 34 | Species | Taxom |
| Trogidae (MacLeay, 1819) | Gnawer beetles | 40 | Species | Taxom |
| Trogiidae Enderlein, 1903 | Granary Booklice | 5 | Species | Taxom |
| Trogossitidae Latreille, 1802 | Bark gnawing beetle | 10 | Species | Taxom |
| Tropiduchidae Stål, 1866 | Tropiduchid Planthoppers | 163 | Species | Taxom |
| Tryonicidae McKittrick &..., 1965 | | 1 | Species | Taxom |
| Ulidiidae Macquart, 1835 | Picture-winged Flies | 4 | Species | Taxom |
| Ulopidae (Le Peletier ..., 1825) | | 18 | Species | Taxom |
| Umenocoleidae Chen & Tian, 1973 | | 7 | Species | Taxom |
| Uraniidae Blanchard, 1845 | Swallowtail Moths | 97 | Species | Taxom |
| Urodidae Kyrki, 1984 | False Burnet Moths | 1 | Species | Taxom |
| Urostylidae (Dallas, 1851) | | 0 | Species | Taxom |
| Veliidae Amyot & Serv..., 1843 | Broad-shouldered bugs | 374 | Species | Taxom |
| Velocipedidae Bergroth, 1891 | Fast-footed bugs | 19 | Species | Taxom |
| Vermileonidae Williston, 1886 | Wormlion | 1 | Species | Taxom |
| Vermipsyllidae Wagner, 1889 | Carnivore fleas | 3 | Species | Taxom |
| Vesperidae Mulsant, 1839 | Vesperid longicorn beetles | 4 | Species | Taxom |
| Vespidae Leach, 1815 | And Allies | 232 | Species | Taxom |
| Weitschatidae Koteja, 2008 | | 1 | Species | Taxom |
| Xenidae Pohl & Beutel, 2005 | | 16 | Species | Taxom |
| Xiphiopsyllidae Wagner, 1939 | | 1 | Species | Taxom |
| Xiphocentronidae Schmid, 1982 | | 52 | Species | Taxom |
| Xiphydriidae Leach, 1819 | Wood wasps | 3 | Species | Taxom |
| Xyelidae Newman, 1835 | Sawfly | 1 | Species | Taxom |
| Xylococcidae (Pergrande, 1898) | | 3 | Species | Taxom |
| Xylomyidae Verrall, 1901 | Wood soldier flies | 14 | Species | Taxom |
| Xylophagidae Fallen, 1810 | Awl-flies | 12 | Species | Taxom |
| Xyloryctidae Meyrick, 1890 | Flower Moths | 34 | Species | Taxom |
| Yponomeutidae Stephens, 1829 | Ermine Moths | 57 | Species | Taxom |
| Ypsolophidae Guenée, 1845 | Ypsolophid Moths | 13 | Species | Taxom |
| Zopheridae Solier, 1834 | Cylindrical bark beetles | 38 | Species | Taxom |
| Zorotypidae Silvestri, 1913 | Angel insects | 19 | Species | Taxom |
| Zygaenidae Latreille, 1809 | Burnet Forester | 137 | Species | Taxom |
