| Acanthocnemidae Crowson, 1964 | | 2 | Species | Taxom |
| Acanthosomatidae Signoret, 1864 | Acanthosomatids | 6 | Species | Taxom |
| Acartophthalmidae Czerny, 1928 | Acartophthalmid flies | 3 | Species | Taxom |
| Achilidae Stål, 1866 | Achilid Planthoppers | 16 | Species | Taxom |
| Acrididae MacLeay, 1819 | Grasshoppers and locusts | 181 | Species | Taxom |
| Acroceridae Leach, 1815 | Hunch-back flies | 26 | Species | Taxom |
| Adelgidae Heinze, 1962 | Adelgids | 8 | Species | Taxom |
| Adelidae Bruand, 1851 | Adelid Moths | 71 | Species | Taxom |
| Ademosynidae Ponomarenko, 1968 | | 7 | Species | Taxom |
| Aderidae Winkler, 1927 | Ant-like leaf beetles | 15 | Species | Taxom |
| Adumbratomorphidae Gorochov, 1987 | | 1 | Species | Taxom |
| Aeolothripidae Uzel, 1895 | Banded thrips | 4 | Species | Taxom |
| Aerophasmidae Martynov, 1928 | | 6 | Species | Taxom |
| Agaonidae Walker, 1848 | Fig wasp | 1 | Species | Taxom |
| Agromyzidae Fallen, 1823 | Leaf miner flies | 186 | Species | Taxom |
| Agyrtidae Thomson, 1859 | Primitive carrion beetles | 13 | Species | Taxom |
| Alexarasniidae Gorochov, 2011 | | 3 | Species | Taxom |
| Aleyrodidae Westwood, 1840 | Whiteflies | 29 | Species | Taxom |
| Alucitidae Leach, 1815 | Many Plumed Moths | 23 | Species | Taxom |
| Alydidae Amyot & Serv..., 1843 | Bean bugs | 3 | Species | Taxom |
| Amorphoscelidae Stål, 1877 | | 1 | Species | Taxom |
| Amphientomidae Enderlein, 1903 | Tropical Barklice | 4 | Species | Taxom |
| Amphipsocidae Mockford, 1978 | Hairy-winged Barklice | 4 | Species | Taxom |
| Ampulicidae Shuckard, 1840 | Ampulicid wasps | 7 | Species | Taxom |
| Anaxyelidae Martynov, 1925 | Anaxyelids | 7 | Species | Taxom |
| Andrenidae Webster, 1913 | Andrenid bees | 69 | Species | Taxom |
| Aneuretopsychidae Rasnitsyn & ..., 1990 | | 1 | Species | Taxom |
| Angarosphecidae Rasnitsyn, 1975 | | 2 | Species | Taxom |
| Anisopodidae Knab, 1912 | Window Midges | 24 | Species | Taxom |
| Antefungivoridae Rohdendorf, 1938 | | 5 | Species | Taxom |
| Anthicidae Latreille, 1819 | Ant beetles | 29 | Species | Taxom |
| Anthocoridae Fieber, 1837 | Flower bugs | 20 | Species | Taxom |
| Anthomyiidae Robineau-Des..., 1830 | Anthomyiid flies | 176 | Species | Taxom |
| Anthomyzidae Czerny, 1903 | Anthomyzid flies | 23 | Species | Taxom |
| Anthracoblattinidae Durden, 1969 | | 9 | Species | Taxom |
| Anthracoptilidae Handlirsch, 1922 | | 10 | Species | Taxom |
| Anthribidae Billberg, 1820 | Fungus Weevil | 106 | Species | Taxom |
| Apataniidae Wallengren, 1886 | Early Smoky Wing Sedges | 46 | Species | Taxom |
| Aphalaridae Löw, 1879 | | 93 | Species | Taxom |
| Aphelinidae Thomson, 1876 | Aphelinid wasps | 46 | Species | Taxom |
| Apheloneuridae Carpenter, 1976 | | 1 | Species | Taxom |
| Aphididae Latreille, 1802 | Aphid | 130 | Species | Taxom |
| Aphodiidae Leach, 1815 | | 2 | Species | Taxom |
| Aphrophoridae Evans, 1946 | Froghoppers | 33 | Species | Taxom |
| Apidae Latreille, 1802 | Bumble bees | 245 | Species | Taxom |
| Aradidae Spinola, 1837 | Flat bug | 37 | Species | Taxom |
| Archaeocynipidae Rasnitsyn & ..., 1988 | | 3 | Species | Taxom |
| Archegocimicidae Handlirsch, 1906 | | 5 | Species | Taxom |
| Archeosmylidae Riek, 1953 | | 1 | Species | Taxom |
| Archescytinidae Tillyard, 1926 | | 47 | Species | Taxom |
| Archijassidae Becker-Migdi..., 1962 | | 4 | Species | Taxom |
| Archimylacridae Handlirsch, 1906 | | 51 | Species | Taxom |
| Archiprobnidae Sharov, 1961 | | 3 | Species | Taxom |
| Archipseudophasmatidae Zompro, 2001 | | 3 | Species | Taxom |
| Archipsocidae Enderlein, 1903 | Ancient Barklice | 1 | Species | Taxom |
| Archipsyllidae Handlirsch, 1908 | | 2 | Species | Taxom |
| Archisialidae Martynov, 1933 | | 1 | Species | Taxom |
| Archizelmiridae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Arctiidae Leach, 1815 | Footman moths | 8 | Species | Taxom |
| Argentinoblattidae Martins-Neto..., 2005 | | 7 | Species | Taxom |
| Argidae Konow, 1890 | Argid flies | 51 | Species | Taxom |
| Arnoldidae Koteja, 2008 | | 2 | Species | Taxom |
| Artematopodidae Lacordaire, 1857 | Soft bodied plant beetle | 7 | Species | Taxom |
| Artheneidae Stål, 1872 | | 7 | Species | Taxom |
| Ascalaphidae Rambur, 1842 | Owlflies | 4 | Species | Taxom |
| Aschiphasmatidae Brunner von ..., 1893 | | 1 | Species | Taxom |
| Asilidae Latreille, 1802 | Assassin flies | 688 | Species | Taxom |
| Asiocoleidae Rohdendorf, 1961 | | 3 | Species | Taxom |
| Asteiidae Rondani, 1856 | Asteiid Flies | 2 | Species | Taxom |
| Atactophlebiidae Martynov, 1930 | | 7 | Species | Taxom |
| Atelestidae Hennig, 1970 | | 2 | Species | Taxom |
| Athericidae Stuckenberg, 1973 | Athericid flies | 9 | Species | Taxom |
| Attelabidae Billberg, 1820 | Leaf Rolling Weevil | 251 | Species | Taxom |
| Aulacidae Shuckard, 1842 | Aulacid wasps | 14 | Species | Taxom |
| Aulacigastridae Wollaston, 1864 | Aulacigastrid flies | 1 | Species | Taxom |
| Austroniidae Kozlov, 1975 | Austroniid wasps | 1 | Species | Taxom |
| Autostichidae Le Marchand, 1947 | Autostichid Moths | 21 | Species | Taxom |
| Axymyiidae Rohdendorf, 1946 | Axymyiidae flies | 6 | Species | Taxom |
| Babinskaiidae Martins-Neto..., 1989 | | 1 | Species | Taxom |
| Baissodidae Benton, 1993 | | 5 | Species | Taxom |
| Baissoferidae Sukatsheva, 1968 | | 4 | Species | Taxom |
| Baissogryllidae Gorochov, 1985 | | 3 | Species | Taxom |
| Baissomantidae Gratshev & Z..., 1993 | | 2 | Species | Taxom |
| Baissopteridae Martynova, 1961 | | 10 | Species | Taxom |
| Bajanzhargalanidae Storozhenko, 1992 | | 2 | Species | Taxom |
| Bajsaphididae Homan, Zyla ..., 2015 | | 6 | Species | Taxom |
| Baleyopterygidae N.D. Siniche..., 1985 | | 13 | Species | Taxom |
| Bardocoleidae Zalessky, 1947 | | 3 | Species | Taxom |
| Batrachedridae Heinemann & ..., 1876 | Batrachedrid Moths | 9 | Species | Taxom |
| Belidae Schönherr, 1826 | Belid Beetle | 7 | Species | Taxom |
| Belostomatidae Leach, 1815 | Alligator ticks | 3 | Species | Taxom |
| Beraeidae Wallengren, 1891 | Small eastern caddisflies | 3 | Species | Taxom |
| Berendtimiridae Winkler, 1987 | | 1 | Species | Taxom |
| Berothidae Handlirsch, 1906 | Beaded lacewing | 9 | Species | Taxom |
| Berytidae Fieber, 1851 | Stilt bug | 18 | Species | Taxom |
| Bethylidae Halliday, 1839 | Bethylid wasps | 50 | Species | Taxom |
| Bethylonymidae Rasnitsyn, 1975 | | 3 | Species | Taxom |
| Bibionidae Fleming, 1821 | Bibionid flies | 43 | Species | Taxom |
| Bintoniellidae Handlirsch, 1937 | | 1 | Species | Taxom |
| Biphyllidae LeConte, 1861 | Biphyllid beetles | 9 | Species | Taxom |
| Bittacidae Handlirsch, 1906 | Hanging scorpionflies | 17 | Species | Taxom |
| Blaberidae Saussure, 1864 | Blaberids | 35 | Species | Taxom |
| Blasticotomidae Thomson, 1871 | Blasticotomid sawflies | 1 | Species | Taxom |
| Blattellidae (Karny, 1908) | German Cockroach | 12 | Species | Taxom |
| Blattidae Stephens, 1829 | American cockroaches | 16 | Species | Taxom |
| Blattinopsidae Bolton, 1925 | | 2 | Species | Taxom |
| Blattogryllidae Rasnitsyn, 1976 | | 5 | Species | Taxom |
| Blattulidae Vishnyokova, 1982 | | 19 | Species | Taxom |
| Blephariceridae Loew, 1861 | Mountain midges | 11 | Species | Taxom |
| Blissidae Stål, 1862 | Chinch Bugs | 9 | Species | Taxom |
| Boholdoyidae Kovalev, 1985 | | 3 | Species | Taxom |
| Bolitophilidae Malloch, 1917 | | 2 | Species | Taxom |
| Bombycidae Latreille, 1802 | Lappet moths | 8 | Species | Taxom |
| Bombyliidae Latreille, 1802 | Bee Flies | 152 | Species | Taxom |
| Boreidae Latreille, 1816 | Snow fleas | 7 | Species | Taxom |
| Boreoscytidae Becker-Migdi..., 1949 | | 3 | Species | Taxom |
| Boridae C. G. Thomson, 1859 | Borids | 1 | Species | Taxom |
| Bostrichidae Latreille, 1802 | Auger beetles | 33 | Species | Taxom |
| Bothrideridae Erichson, 1845 | Cocoon-forming beetles | 6 | Species | Taxom |
| Brachodidae Agenjo, 1966 | Little Bear Moths | 8 | Species | Taxom |
| Brachycentridae Ulmer, 1903 | Humpless Casemaker Caddisflies | 7 | Species | Taxom |
| Brachyceridae (Billberg, 1820) | Brachycerids | 1 | Species | Taxom |
| Brachypteridae (Erichson, 1845) | Short-winged Flower Beetles | 18 | Species | Taxom |
| Brachystomatidae Melander, 1908 | | 5 | Species | Taxom |
| Braconidae Latreille, 1829 | Braconid wasps | 247 | Species | Taxom |
| Bradynobaenidae Saussure, 1892 | Bradynobaenid wasps | 1 | Species | Taxom |
| Brahmaeidae Swinhoe, 1892 | Brahmin Moths | 3 | Species | Taxom |
| Brassolidae (Boisduval, 1836) | | 1 | Species | Taxom |
| Braulidae Egger, 1853 | Bee lice | 1 | Species | Taxom |
| Brentidae Billberg, 1820 | Brenthidae | 260 | Species | Taxom |
| Brongniartiellidae Martynova, 1949 | | 2 | Species | Taxom |
| Buprestidae Leach, 1815 | Flat-headed wood-borers | 152 | Species | Taxom |
| Byrrhidae Latreille, 1804 | Moss beetles | 44 | Species | Taxom |
| Byturidae Jacquelin du..., 1858 | Fruit worms | 2 | Species | Taxom |
| Cacurgidae Handlirsch, 1911 | | 3 | Species | Taxom |
| Caeciliusidae Kolbe, 1880 | Lizard Barklice | 16 | Species | Taxom |
| Calamoceratidae Ulmer, 1905 | | 7 | Species | Taxom |
| Caliscelidae Amyot & Serv..., 1843 | Piglet Bugs | 4 | Species | Taxom |
| Callaphididae (Borner, 1952) | | 3 | Species | Taxom |
| Callidulidae Moore, 1877 | Old World Butterfly Moths | 3 | Species | Taxom |
| Calliphoridae Brauer & Ber..., 1889 | Blow flies | 78 | Species | Taxom |
| Caloneuridae Handlirsch, 1906 | | 4 | Species | Taxom |
| Calophyidae Vondracek, 1957 | | 6 | Species | Taxom |
| Camillidae Frey, 1921 | Camillid flies | 2 | Species | Taxom |
| Camptoneuritidae Martynov, 1930 | | 1 | Species | Taxom |
| Canadaphididae Richards, 1966 | | 2 | Species | Taxom |
| Cantacaderidae (Stal, 1873) | | 1 | Species | Taxom |
| Cantharidae Imhoff, 1856 | Cantharids | 120 | Species | Taxom |
| Canthyloscelidae Enderlein, 1912 | | 4 | Species | Taxom |
| Capniidae Klapálek, 1905 | Capniid winter stoneflies | 55 | Species | Taxom |
| Carabidae Latreille, 1802 | Carabid beetles | 2714 | Species | Taxom |
| Carcinophoridae Hincks, 1954 | | 5 | Species | Taxom |
| Caridae Thompson, 1992 | | 9 | Species | Taxom |
| Carnidae Newman, 1834 | Bird flies | 8 | Species | Taxom |
| Carposinidae Walsingham, 1907 | Carposinid moths | 16 | Species | Taxom |
| Cecidomyiidae Newman, 1834 | Cecidomyidae | 1063 | Species | Taxom |
| Cephidae Newman, 1834 | Cephids | 38 | Species | Taxom |
| Cerambycidae Latreille, 1802 | Long Horn beetles | 706 | Species | Taxom |
| Ceraphronidae Haliday, 1833 | Ceraphronid wasps | 0 | Species | Taxom |
| Ceratophyllidae Dampf, 1908 | Bird Fleas | 87 | Species | Taxom |
| Ceratopogonidae Newman, 1834 | Biting midge | 546 | Species | Taxom |
| Cercopidae Leach, 1815 | Froghopper | 23 | Species | Taxom |
| Cerococcidae Balachowsky, 1942 | Cerococcids | 1 | Species | Taxom |
| Cerophytidae Latreille, 1834 | Cerophytid beetles | 5 | Species | Taxom |
| Cerylonidae Billberg, 1820 | Cerylid Kingfishers | 3 | Species | Taxom |
| Chaeteessidae Handlirsch, 1920 | | 4 | Species | Taxom |
| Chalcididae Latreille, 1817 | Chalcidid wasps | 5 | Species | Taxom |
| Chamaemyiidae Hendel, 1910 | Aphid flies | 37 | Species | Taxom |
| Chaoboridae Newman, 1834 | Phantom midge | 24 | Species | Taxom |
| Chaulioditidae Handlirsch, 1908 | | 7 | Species | Taxom |
| Chironomidae Erichson, 1842 | Chironomids | 676 | Species | Taxom |
| Chloroperlidae Okamoto, 1912 | Green stoneflies | 30 | Species | Taxom |
| Chloropidae Schoenherr, 1840 | Chloropid flies | 317 | Species | Taxom |
| Choreutidae Stainton, 1854 | Choreuitid Moths | 28 | Species | Taxom |
| Chrysididae Latreille, 1802 | Chrysidid wasps | 54 | Species | Taxom |
| Chrysomelidae Latreille, 1802 | Casebearers | 752 | Species | Taxom |
| Chrysopidae Schneider, 1851 | And Green Lacewings | 20 | Species | Taxom |
| Chyromyidae Hendel, 1916 | Chiromyid flies | 1 | Species | Taxom |
| Cicadellidae Latreille, 1802 | Cicadellids | 1296 | Species | Taxom |
| Cicadidae Westwood, 1840 | Cicada | 82 | Species | Taxom |
| Cicadomorphidae Handlirsch, 1906 | Giant cicadas | 2 | Species | Taxom |
| Ciidae Leach, 1819 | Minute tree fungus beetles | 63 | Species | Taxom |
| Cimbicidae Kirby, 1837 | Cimbicid sawflies | 38 | Species | Taxom |
| Cimicidae Latreille, 1802 | Bat bugs | 2 | Species | Taxom |
| Cixiidae Spinola, 1839 | Cixid planthoppers | 78 | Species | Taxom |
| Cladochoristidae Tillyard, 1926 | | 2 | Species | Taxom |
| Clambidae Fischer, 1821 | Fringe-winged beetles | 1 | Species | Taxom |
| Cleridae Latreille, 1802 | Checkered Beetle | 61 | Species | Taxom |
| Clusiidae Schönherr, 1840 | Clusiid flies | 24 | Species | Taxom |
| Cnemidolestidae Handlirsch, 1906 | | 5 | Species | Taxom |
| Coccidae Stephens, 1829 | Soft scale | 74 | Species | Taxom |
| Coccinellidae Latreille, 1807 | Coccinelles | 80 | Species | Taxom |
| Coelopidae Hendel, 1910 | Kelp Flies | 2 | Species | Taxom |
| Coleophoridae Hübner, 1825 | Case moths | 648 | Species | Taxom |
| Coleoscytidae Martynov, 1935 | | 10 | Species | Taxom |
| Colletidae Lepeletier, 1841 | Colletid bees | 42 | Species | Taxom |
| Coniopterygidae Burmeister, 1839 | Dusty lacewings | 9 | Species | Taxom |
| Conopidae Latreille, 1802 | Thick-headed Flies | 49 | Species | Taxom |
| Coptoclavidae Ponomarenko, 1961 | Extinct family | 10 | Species | Taxom |
| Coptopsyllidae Wagner, 1928 | | 2 | Species | Taxom |
| Coreidae Leach, 1815 | Broad-headed bugs | 35 | Species | Taxom |
| Corioxenidae Kinzelbach, 1970 | | 1 | Species | Taxom |
| Corixidae Leach, 1815 | Lesser Water-Boatman | 25 | Species | Taxom |
| Corydalidae Burmeister, 1839 | Dobsonflies | 4 | Species | Taxom |
| Corydasialidae Wichard & al., 2005 | | 1 | Species | Taxom |
| Corydiidae de Saussure, 1864 | Sand cockroaches | 15 | Species | Taxom |
| Corylophidae LeConte, 1852 | Hooded beetles | 5 | Species | Taxom |
| Cosmopterigidae Heinemann & ..., 1876 | Cosmet Moths | 93 | Species | Taxom |
| Cossidae Leach, 1815 | Borers | 61 | Species | Taxom |
| Crabronidae Latreille, 1802 | Bee Wolves | 103 | Species | Taxom |
| Crambidae Latreille, 1810 | Crambid Snout Moths | 704 | Species | Taxom |
| Cretomantidae Gratshev & Z..., 1994 | | 1 | Species | Taxom |
| Cryptocercidae Handlirsch, 1925 | Brown-hooded cockroaches | 1 | Species | Taxom |
| Cryptochetidae Brues & Mela..., 1932 | Cryptochetid Flies | 2 | Species | Taxom |
| Cryptococcidae | | 4 | Species | Taxom |
| Cryptophagidae Kirby, 1937 | Mould beetles | 32 | Species | Taxom |
| Ctenophthalmidae Rothschild, 1915 | | 73 | Species | Taxom |
| Cucujidae Latreille, 1802 | Flat bark beetles | 12 | Species | Taxom |
| Culicidae Meigen, 1818 | Mosquito | 115 | Species | Taxom |
| Cupedidae Laporte, 1836 | Cupedids | 21 | Species | Taxom |
| Curculionidae Latreille, 1802 | Ambrosia beetles | 2017 | Species | Taxom |
| Curtonotidae Duda, 1934 | Curtonotid flies | 3 | Species | Taxom |
| Cycloristidae Martynova, 1958 | | 2 | Species | Taxom |
| Cydnidae Billberg, 1820 | Burrower bugs | 9 | Species | Taxom |
| Cylindrotomidae (Mulsant, 1842) | Cylindrotomid Crane Flies | 2 | Species | Taxom |
| Cymidae Baerensprung, 1860 | | 5 | Species | Taxom |
| Cynipidae Latreille, 1802 | Cynipid gall wasps | 25 | Species | Taxom |
| Cypselosomatidae Hennig, 1958 | Cypselosomatid flies | 1 | Species | Taxom |
| Daldubidae Storozhenko, 1996 | | 2 | Species | Taxom |
| Dascillidae Guérin-Ménev..., 1843 | Orchid beetles | 3 | Species | Taxom |
| Dasydemellidae | Shaggy Psocids | 1 | Species | Taxom |
| Decliniidae Nikitsky, La..., 1994 | Declinia relicta | 1 | Species | Taxom |
| Deinotitanidae Gorochov, 2011 | | 1 | Species | Taxom |
| Delphacidae Leach, 1815 | Delphacid planthoppers | 153 | Species | Taxom |
| Derbidae Spinola, 1839 | Derbid planthoppers | 8 | Species | Taxom |
| Dermestidae Hope, 1840 | Carpet beetles | 124 | Species | Taxom |
| Derodontidae LeConte, 1861 | Tooth-neck fungus beetles | 8 | Species | Taxom |
| Deuterophlebiidae Edwards, 1922 | Mountain midges | 1 | Species | Taxom |
| Diapheromeridae Rehn & Hebard, 1909 | Diapheromerid Stick Insects | 1 | Species | Taxom |
| Diapriidae Latreille, 1796 | Diapriid wasps | 24 | Species | Taxom |
| Diaspididae Maskell, 1878 | Armored scale insects | 69 | Species | Taxom |
| Diastatidae Hendel, 1917 | Bog flies | 9 | Species | Taxom |
| Dictyopharidae Spinola, 1839 | Dictyopharid Planthoppers | 12 | Species | Taxom |
| Dilaridae Newman, 1853 | Pleasing lacewing | 2 | Species | Taxom |
| Dinoblattidae Durden, 1969 | | 2 | Species | Taxom |
| Dinopanorpidae Carpenter, 1972 | | 2 | Species | Taxom |
| Diopsidae Billberg, 1820 | Stalk-eyed flies | 4 | Species | Taxom |
| Diprionidae Rohwer, 1911 | Conifer sawflies | 21 | Species | Taxom |
| Dipseudopsidae Ulmer, 1904 | | 6 | Species | Taxom |
| Dixidae Schiner, 1868 | Dixid Midges | 6 | Species | Taxom |
| Dolichopodidae Latreille, 1809 | Long legged flies | 755 | Species | Taxom |
| Doubraviidae Aristov, 2015 | | 2 | Species | Taxom |
| Douglasiidae Heinemann & ..., 1876 | Douglas Moths | 17 | Species | Taxom |
| Drepanidae Meyrick, 1895 | Drepanids | 51 | Species | Taxom |
| Drosophilidae Rondani, 1856 | Fruit flies | 50 | Species | Taxom |
| Dryinidae Haliday, 1840 | Dryinid wasps | 31 | Species | Taxom |
| Dryomyzidae Schiner, 1862 | Dryomyzid flies | 12 | Species | Taxom |
| Dryophthoridae (Schönherr, 1825) | Palm weevils | 2 | Species | Taxom |
| Dryopidae Billberg, 1820 | Long toed water beetle | 5 | Species | Taxom |
| Dunstaniidae Tillyard, 1916 | | 2 | Species | Taxom |
| Dysmorphoptilidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Dysoneuridae Sukatsheva, 1968 | | 5 | Species | Taxom |
| Dytiscidae Leach, 1815 | Diving beetles | 348 | Species | Taxom |
| Ecnomidae Ulmer, 1903 | | 21 | Species | Taxom |
| Ectobiidae (Brunner von ..., 1865) | Wood cockroaches | 7 | Species | Taxom |
| Ectopsocidae | Outer Barklice | 6 | Species | Taxom |
| Elachistidae Bruand, 1851 | Elachistid moths | 429 | Species | Taxom |
| Elateridae Leach, 1815 | Click Beetle | 142 | Species | Taxom |
| Elcanidae Handlirsch, 1906 | | 5 | Species | Taxom |
| Electrentomidae Enderlein, 1911 | | 2 | Species | Taxom |
| Electrotomidae Rasnitsyn, 1977 | | 1 | Species | Taxom |
| Elektraphididae Steffan, 1968 | | 7 | Species | Taxom |
| Elipsocidae Pearman, 1936 | Damp Barklice | 12 | Species | Taxom |
| Elliidae Krzeminska, ..., 1993 | | 1 | Species | Taxom |
| Ellinaphididae Kania & Wegi..., 2008 | | 20 | Species | Taxom |
| Elmidae Curtis, 1830 | Drive beetles | 11 | Species | Taxom |
| Embiidae Burmeister, 1839 | | 1 | Species | Taxom |
| Embolemidae Förster, 1856 | Embolemid wasps | 4 | Species | Taxom |
| Empheriidae Enderlein, 1906 | | 2 | Species | Taxom |
| Empididae Latreille, 1809 | Balloon flies | 405 | Species | Taxom |
| Encyrtidae Walker, 1837 | Encyrtid wasps | 192 | Species | Taxom |
| Endomychidae Leach, 1815 | False Ladybirds | 14 | Species | Taxom |
| Endromidae Boisduval, 1828 | Glory Moths | 1 | Species | Taxom |
| Eneopteridae (Saussure, 1893) | Bush cricket | 1 | Species | Taxom |
| Ensiferophasmatidae Zompro, 2005 | | 1 | Species | Taxom |
| Eoichneumonidae (Jell & Duncan, 1986) | | 12 | Species | Taxom |
| Eolepidopterigidae Rasnitsyn, 1983 | | 3 | Species | Taxom |
| Eomeropidae Cockerell, 1909 | | 2 | Species | Taxom |
| Epermeniidae Spuler, 1910 | Epermeniid moths | 36 | Species | Taxom |
| Ephialtitidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Ephydridae Zetterstedt, 1837 | Brine flies | 78 | Species | Taxom |
| Epicopeiidae Swinhoe, 1892 | Oriental Swallowtail Moths | 2 | Species | Taxom |
| Epideigmatidae Handlirsch, 1911 | | 3 | Species | Taxom |
| Epipsocidae | Elliptical bark louse | 2 | Species | Taxom |
| Episactidae Burr, 1899 | | 1 | Species | Taxom |
| Erebidae Leach, 1815 | Erebid Moths | 884 | Species | Taxom |
| Eremochaetidae Ussatchov, 1968 | | 5 | Species | Taxom |
| Eriococcidae Cockerell, 1899 | Eriococcid scales | 42 | Species | Taxom |
| Eriocottidae Spuler, 1898 | Old World Spiny Winged Moths | 1 | Species | Taxom |
| Eriocraniidae Rebel, 1901 | Eriocraniid moths | 14 | Species | Taxom |
| Erotylidae Latreille, 1802 | Pleasing Fungus Beetle | 18 | Species | Taxom |
| Eucharitidae Latreille, 1809 | Eucharitid wasp | 1 | Species | Taxom |
| Eucinetidae Lacordaire, 1857 | Plate-thigh beetle | 4 | Species | Taxom |
| Eucnemidae Eschscholtz, 1829 | Click Beetles | 24 | Species | Taxom |
| Eulophidae Westwood, 1829 | Eulophid wasps | 105 | Species | Taxom |
| Eupelmidae Walker, 1833 | Eupelmid wasps | 12 | Species | Taxom |
| Euryptilonidae Martynov, 1940 | | 3 | Species | Taxom |
| Eurytomidae Walker, 1832 | Eurytomid wasps | 68 | Species | Taxom |
| Eustheniidae Tillyard, 1921 | | 1 | Species | Taxom |
| Euteliidae Grote, 1882 | Euteliid Moths | 4 | Species | Taxom |
| Euthygrammatidae Martynov, 1928 | | 1 | Species | Taxom |
| Evaniidae Latreille, 1802 | Ensign wasp | 12 | Species | Taxom |
| Evenkidae Rasnitsyn, 1983 | | 1 | Species | Taxom |
| Falsiformicidae Rasnitsyn, 1975 | | 1 | Species | Taxom |
| Fanniidae Schnabl & Dz..., 1911 | Latrine flies | 13 | Species | Taxom |
| Figitidae Thomson, 1862 | Figitid wasps | 12 | Species | Taxom |
| Flatidae Spinola, 1839 | Flatid planthoppers | 5 | Species | Taxom |
| Forficulidae Stephens, 1829 | Common Earwig | 31 | Species | Taxom |
| Formicidae Latreille, 1809 | Ant | 611 | Species | Taxom |
| Fulgoridae Latreille, 1807 | Fulgorid Planthopper | 2 | Species | Taxom |
| Galacticidae Minet, 1986 | Galacticid Moths | 2 | Species | Taxom |
| Geinitziidae Handlirsch, 1906 | | 9 | Species | Taxom |
| Gelechiidae Stainton, 1854 | Gelechiid moths | 839 | Species | Taxom |
| Geocoridae Baerensprung, 1860 | Big-eyed Bugs | 21 | Species | Taxom |
| Geometridae Leach, 1815 | Cankerworm moths | 1512 | Species | Taxom |
| Geotrupidae Latreille, 1802 | Dor beetles | 36 | Species | Taxom |
| Gerapompidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Geraridae Scudder, 1885 | | 1 | Species | Taxom |
| Gerocynipidae Kovalev, 1994 | | 5 | Species | Taxom |
| Gerridae Leach, 1815 | Jesus bugs | 12 | Species | Taxom |
| Glaphyridae MacLeay, 1819 | Bumble bee scarab beetle | 12 | Species | Taxom |
| Glaresidae Kolbe, 1905 | Enigmatic scarab beetle | 8 | Species | Taxom |
| Glossopteridae Sharov, 1966 | | 1 | Species | Taxom |
| Glossosomatidae Wallengren, 1891 | Little Black Caddisflies | 20 | Species | Taxom |
| Glyphipterigidae Stainton, 1854 | Glyphipterigid moths | 32 | Species | Taxom |
| Goeridae Ulmer, 1903 | | 12 | Species | Taxom |
| Gracillariidae Stainton, 1854 | Blotch leaf miner moths | 296 | Species | Taxom |
| Gripopterygidae Enderlein, 1909 | | 2 | Species | Taxom |
| Grohnidae Koteja, 2008 | | 1 | Species | Taxom |
| Gryllacrididae Blanchard, 1845 | Camel Crickets | 3 | Species | Taxom |
| Gryllidae Bolivar, 1878 | Crickets | 12 | Species | Taxom |
| Grylloblattidae E. M. Walker, 1914 | Grylloblattids | 4 | Species | Taxom |
| Gryllotalpidae Saussure, 1870 | Mole cricket | 4 | Species | Taxom |
| Gyrinidae Latreille, 1802 | Whirligig beetle | 27 | Species | Taxom |
| Haglidae Handlirsch, 1906 | Hump-winged cricket | 5 | Species | Taxom |
| Haglotettigoniidae Gorochov, 1988 | | 1 | Species | Taxom |
| Halictidae Thomson, 1869 | Flower bees | 93 | Species | Taxom |
| Halictophagidae Perkins, 1905 | | 1 | Species | Taxom |
| Haliplidae Aubé, 1836 | Crawling Water Beetle | 39 | Species | Taxom |
| Hapalopteridae Handlirsch, 1906 | | 1 | Species | Taxom |
| Hebridae Amyot and Se..., 1843 | Velvet water bug | 4 | Species | Taxom |
| Heleomyzidae (Westwood, 1840) | Heleomyzid flies | 105 | Species | Taxom |
| Helicopsychidae Ulmer, 1912 | Snail Case caddisflies | 12 | Species | Taxom |
| Heliodinidae Heinemann & ..., 1876 | Heliodinid moths | 2 | Species | Taxom |
| Heliozelidae Heinemann & ..., 1876 | Leaf miners | 8 | Species | Taxom |
| Helophoridae (Leach, 1815) | Water scavenger beetles | 1 | Species | Taxom |
| Heloridae Förster, 1856 | Helorid wasps | 4 | Species | Taxom |
| Hemerobiidae Latreille, 1802 | Brown Lacewing | 20 | Species | Taxom |
| Hemimylacridae Waterlot, 1934 | | 1 | Species | Taxom |
| Hepialidae Stephens, 1829 | Ghost Moths | 28 | Species | Taxom |
| Hesperiidae Latreille, 1809 | Indet. Skipper | 135 | Species | Taxom |
| Hesperinidae Hendel, 1928 | | 6 | Species | Taxom |
| Heteroceridae MacLeay, 1825 | Mud beetles | 19 | Species | Taxom |
| Heterogastridae Stål, 1872 | | 6 | Species | Taxom |
| Heterothripidae Bagnall, 1912 | | 1 | Species | Taxom |
| Hilarimorphidae Hendel, 1936 | Hilarimorphid flies | 1 | Species | Taxom |
| Himantopteridae Rogenhofer, 1884 | Long Tailed Burnet Moths | 1 | Species | Taxom |
| Hippoboscidae Samouelle, 1819 | Keds | 16 | Species | Taxom |
| Histeridae Gyllenhal, 1808 | Clown beetle | 215 | Species | Taxom |
| Hodotermitidae Desneux, 1904 | Harvester termites | 1 | Species | Taxom |
| Hoffeinsmyiidae Michelsen, 2009 | | 1 | Species | Taxom |
| Holcopogonidae Gozmany, 1967 | | 1 | Species | Taxom |
| Homoeodictyidae Martynov, 1937 | | 1 | Species | Taxom |
| Homotomidae Heslop-Harrison, 1958 | | 1 | Species | Taxom |
| Hoplopleuridae Ewing, 1929 | | 2 | Species | Taxom |
| Hoploridiidae Popov & Shch..., 1991 | | 1 | Species | Taxom |
| Hybosoridae Erichson, 1847 | Pill scarab beetles | 8 | Species | Taxom |
| Hybotidae Meigen, 1820 | Dance flies | 231 | Species | Taxom |
| Hydraenidae Mulsant, 1844 | Cascade Beetles | 70 | Species | Taxom |
| Hydrobiosidae Ulmer, 1905 | | 25 | Species | Taxom |
| Hydrochidae (Thomson, 1859) | | 1 | Species | Taxom |
| Hydrometridae Billberg, 1820 | Marsh treader | 7 | Species | Taxom |
| Hydrophilidae Latreille, 1802 | Silver Water Beetles | 280 | Species | Taxom |
| Hydropsychidae Curtis, 1835 | Net Spinning caddisflies | 38 | Species | Taxom |
| Hydroptilidae Stephens, 1836 | Micro caddisflies | 117 | Species | Taxom |
| Hylicellidae Evans, 1956 | | 3 | Species | Taxom |
| Hypsipterygidae Drake, 1961 | | 1 | Species | Taxom |
| Hystrichopsyllidae Tiraboschi, 1904 | Insectivore fleas | 8 | Species | Taxom |
| Ibaliidae Thomson, 1862 | Ibaliid wasps | 2 | Species | Taxom |
| Ichneumonidae Latreille, 1802 | Ichneumon flies | 288 | Species | Taxom |
| Ichneumonomimidae Rasnitsyn, 1975 | | 1 | Species | Taxom |
| Ideliidae (Zalessky, 1929) | | 30 | Species | Taxom |
| Idelinellidae Storozhenko, 1997 | | 7 | Species | Taxom |
| Incurvariidae Spuler, 1898 | Fairy moths | 17 | Species | Taxom |
| Ingruidae Becker-Migdi..., 1960 | | 9 | Species | Taxom |
| Inkaidae Koteja, 1989 | | 1 | Species | Taxom |
| Inocelliidae Navas, 1913 | Inocelliid snakeflies | 5 | Species | Taxom |
| Ipsviciidae Tillyard, 1919 | | 1 | Species | Taxom |
| Ironomyiidae McAlpine & M..., 1966 | Ironic flies | 12 | Species | Taxom |
| Ischnoneuridae Handlirsch, 1906 | | 2 | Species | Taxom |
| Ischnopsyllidae Wahlgren, 1907 | Bat fleas | 12 | Species | Taxom |
| Issidae Spinola, 1839 | Issid planthoppers | 30 | Species | Taxom |
| Ithonidae Newman, 1838 | Ithonid lacewings | 1 | Species | Taxom |
| Ithyceridae (Schönherr, 1826) | New York weevil | 1 | Species | Taxom |
| Ivapteridae Aristov, 2009 | | 1 | Species | Taxom |
| Jacobsoniidae Heller, 1926 | Jacobson's beetles | 1 | Species | Taxom |
| Jurapriidae Rasnitsyn, 1983 | | 1 | Species | Taxom |
| Jurodidae Ponomarenko, 1985 | Jurodids | 2 | Species | Taxom |
| Kalligrammatidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Kalotermitidae Froggatt, 1897 | Dampwood termites | 2 | Species | Taxom |
| Kaltanidae Martynova, 1958 | | 31 | Species | Taxom |
| Karabasiidae Popov, 1985 | | 4 | Species | Taxom |
| Kargalopteridae Aristov, 2009 | | 1 | Species | Taxom |
| Kateretidae Kirkby, 1837 | Pollen Beetles | 4 | Species | Taxom |
| Kermesidae Signoret, 1875 | Gall-like Scale Insects | 3 | Species | Taxom |
| Keroplatidae Rondani, 1856 | Fungus gnats | 83 | Species | Taxom |
| Khatangaphididae Heie, 2000 | | 2 | Species | Taxom |
| Kortshakoliidae Storozhenko, 1997 | | 2 | Species | Taxom |
| Kuwaniidae MacGillvray, 1921 | | 3 | Species | Taxom |
| Labiduridae Verhoeff, 1902 | Long-horned earwig | 2 | Species | Taxom |
| Labiidae (Burr, 1909) | Little earwig | 6 | Species | Taxom |
| Lachesillidae Pearman, 1936 | Fateful Barklice | 5 | Species | Taxom |
| Lagriidae (Latreille, 1825) | Lagriid beetles | 1 | Species | Taxom |
| Lampyridae Latreille, 1817 | Fireflies | 6 | Species | Taxom |
| Largidae Amyot and Se..., 1843 | Bordered plant bugs | 2 | Species | Taxom |
| Lasiocampidae Harris, 1841 | Eggar Moths | 63 | Species | Taxom |
| Lasiosynidae Kirejtshuk, ..., 2010 | | 13 | Species | Taxom |
| Latridiidae Erichson, 1842 | Minute brown scavenger beetle | 39 | Species | Taxom |
| Lauxaniidae Macquart, 1835 | Beach flies | 131 | Species | Taxom |
| Lecithoceridae Le Marchand, 1947 | Long-horned moths | 9 | Species | Taxom |
| Leiodidae Fleming, 1821 | Round fungus beetles | 231 | Species | Taxom |
| Lemmatophoridae Sellards, 1909 | | 18 | Species | Taxom |
| Lemoniidae Hampson, 1918 | Autumn Silkworm Moths | 4 | Species | Taxom |
| Lepidostomatidae Ulmer, 1903 | Bizarre Caddisflies | 25 | Species | Taxom |
| Leptoceridae Leach, 1815 | Long Horned caddisflies | 104 | Species | Taxom |
| Leptopsyllidae Rothschild &..., 1915 | Bird fleas | 31 | Species | Taxom |
| Leucospidae Fabricius, 1775 | Leucospid wasps | 1 | Species | Taxom |
| Leuctridae Klapálek, 1905 | Needle Or Willow Stoneflies | 30 | Species | Taxom |
| Liadytidae Ponomarenko, 1977 | | 6 | Species | Taxom |
| Liassophilidae Tillyard, 1933 | | 2 | Species | Taxom |
| Limacodidae Duponchel, 1845 | Cup moths | 26 | Species | Taxom |
| Limnephilidae Kolenati, 1848 | Northern caddisflies | 210 | Species | Taxom |
| Limnichidae Erichson, 1846 | Minute marsh loving beetle | 4 | Species | Taxom |
| Limoniidae (Speiser, 1909) | Craneflies | 137 | Species | Taxom |
| Liomopteridae Sellards, 1909 | | 57 | Species | Taxom |
| Liposcelididae Enderlein, 1911 | Booklice | 8 | Species | Taxom |
| Lithopanorpidae Carpenter, 1930 | | 1 | Species | Taxom |
| Lithoscarabaeidae Nikolajev, 1992 | | 2 | Species | Taxom |
| Lithuanicoccidae Koteja, 2008 | | 2 | Species | Taxom |
| Liviidae Low, 1879 | | 27 | Species | Taxom |
| Locustavidae Sharov, 1968 | | 1 | Species | Taxom |
| Locustopsidae Handlirsch, 1906 | | 4 | Species | Taxom |
| Lonchaeidae Loew, 1861 | Lance Flies | 53 | Species | Taxom |
| Lonchopteridae Curtis, 1839 | Pointed-wing flies | 12 | Species | Taxom |
| Lophioneuridae Tillyard, 1921 | | 13 | Species | Taxom |
| Lucanidae Latreille, 1804 | Stag Beetle | 45 | Species | Taxom |
| Lycaenidae Leach, 1815 | And blues | 401 | Species | Taxom |
| Lycidae Laporte, 1836 | Lycid beetles | 67 | Species | Taxom |
| Lygaeidae Schilling, 1829 | Chinch bugs | 49 | Species | Taxom |
| Lygistorrhinidae Hendel, 1936 | Long beaked fungus gnat | 2 | Species | Taxom |
| Lymexylidae Fleming, 1821 | Ship-timber beetle | 5 | Species | Taxom |
| Lyonetiidae Stainton, 1854 | Lyonet Moths | 83 | Species | Taxom |
| Maguviopseidae Shcherbakov, 2011 | | 1 | Species | Taxom |
| Maimetshidae (Rasnitsyn, 1975) | | 2 | Species | Taxom |
| Malcidae Stål, 1865 | | 1 | Species | Taxom |
| Mantidae Burmeister, 1838 | Mantids | 17 | Species | Taxom |
| Mantispidae Leach, 1815 | Mantid lacewings | 3 | Species | Taxom |
| Mantoididae Giglio-Tos, 1927 | | 1 | Species | Taxom |
| Mantophasmatidae Zompro, Kla..., 2002 | Gladiators | 4 | Species | Taxom |
| Marchalinidae Morrison, 1927 | | 1 | Species | Taxom |
| Margarodidae Newstead, 1901 | Cottony cushion scales | 3 | Species | Taxom |
| Mastotermitidae Desneux, 1904 | | 3 | Species | Taxom |
| Matsucoccidae Morrison, 1927 | Pine bark scales | 9 | Species | Taxom |
| Meenoplidae Fieber, 1872 | | 1 | Species | Taxom |
| Megachilidae Schenk, 1860 | And Resin Bees | 123 | Species | Taxom |
| Megakhosaridae Sharov, 1961 | | 11 | Species | Taxom |
| Megalodontesidae Konow, 1897 | | 12 | Species | Taxom |
| Megalopodidae Latreille, 1802 | Megalopodid Leaf Beetles | 10 | Species | Taxom |
| Megalyridae Schletterer, 1889 | Megalyrid wasps | 11 | Species | Taxom |
| Megamerinidae Hendel, 1913 | Megamerinid flies | 4 | Species | Taxom |
| Megaspilidae Ashmead, 1893 | Megaspilid wasps | 7 | Species | Taxom |
| Melandryidae Leach, 1815 | False Darkling Beetle | 43 | Species | Taxom |
| Melanthripidae Bagnall, 1913 | | 1 | Species | Taxom |
| Melittidae Schenk, 1860 | Melittid bees | 16 | Species | Taxom |
| Meloidae Gyllenhal, 1810 | Blister Beetle | 68 | Species | Taxom |
| Melolonthidae (Leach, 1817) | Chafers | 5 | Species | Taxom |
| Melyridae Leach, 1815 | Malachite Beetles | 29 | Species | Taxom |
| Membracidae Germar, 1821 | Horned Treehoppers | 19 | Species | Taxom |
| Mengeidae Pierce, 1908 | | 1 | Species | Taxom |
| Meropeidae Espen-Petersen, 1921 | Earwig-flies | 1 | Species | Taxom |
| Merothripidae Hood, 1914 | Large-legged thrips | 2 | Species | Taxom |
| Mesoblattinidae Handlirsch, 1906 | | 18 | Species | Taxom |
| Mesochrysopidae Handlirsch, 1906 | | 7 | Species | Taxom |
| Mesoedischiidae Gorochov, 1987 | | 1 | Species | Taxom |
| Mesoleuctridae Sinitshenkova, 1982 | | 4 | Species | Taxom |
| Mesopentacoridae Popov, 1968 | | 1 | Species | Taxom |
| Mesopsocidae Enderlein, 1903 | Middle Barklice | 10 | Species | Taxom |
| Mesopsychidae Tillyard, 1917 | | 16 | Species | Taxom |
| Mesoraphidiidae Martynov, 1925 | | 9 | Species | Taxom |
| Mesorthopteridae Tillyard, 1922 | | 12 | Species | Taxom |
| Mesosciophilidae Rohdendorf, 1946 | | 5 | Species | Taxom |
| Mesoserphidae Kozlov, 1970 | | 3 | Species | Taxom |
| Mesotitanidae Tillyard, 1925 | | 3 | Species | Taxom |
| Micronectidae Jaczewski, 1924 | Pygmy water boatmen | 6 | Species | Taxom |
| Micronoctuidae Fibiger, 2005 | | 2 | Species | Taxom |
| Micropezidae Illiger, 1798 | Stilt Flies | 26 | Species | Taxom |
| Microphysidae Dohrn, 1859 | Microphysid bugs | 8 | Species | Taxom |
| Micropterigidae Herrich-Schä..., 1855 | Mandibulate Archaic Moths | 17 | Species | Taxom |
| Milichiidae Schiner, 1862 | Filth flies | 11 | Species | Taxom |
| Mimarachnidae Shcherbakov, 2007 | | 2 | Species | Taxom |
| Miridae Hahn, 1831 | Capsid bugs | 539 | Species | Taxom |
| Mirinidae (Kozlov, 1985) | | 1 | Species | Taxom |
| Mogoplistidae Saussure, 1877 | Scaly cricket | 1 | Species | Taxom |
| Molannidae Wallengren, 1891 | Hood Casemaker Caddisflies | 3 | Species | Taxom |
| Monophlebidae Signoret, 1875 | Giant scale | 6 | Species | Taxom |
| Monotomidae Laporte, 1840 | Minute Clubbed Beetles | 15 | Species | Taxom |
| Mordellidae Latreille, 1802 | Pintail beetles | 34 | Species | Taxom |
| Muchoriidae Willmann, 1989 | | 1 | Species | Taxom |
| Muscidae Latreille, 1802 | Face flies | 360 | Species | Taxom |
| Mutillidae André, 1907 | Cow ant | 5 | Species | Taxom |
| Mutoviidae Vršanský & A..., 2012 | | 1 | Species | Taxom |
| Mycetophagidae Leach, 1815 | Hairy fungus beetle | 20 | Species | Taxom |
| Mycetophilidae Newman, 1834 | Fungus Gnat | 1283 | Species | Taxom |
| Mycteridae Blanchard, 1845 | Mycterid beetles | 4 | Species | Taxom |
| Mylacridae Scudder, 1886 | | 1 | Species | Taxom |
| Mymaridae Haliday, 1833 | Fairflies | 32 | Species | Taxom |
| Mymarommatidae Debauche, 1948 | False fairy wasp | 8 | Species | Taxom |
| Myrmecolacidae Saunders, 1872 | | 5 | Species | Taxom |
| Myrmecophilidae Saussure, 1874 | Ant cricket | 1 | Species | Taxom |
| Myrmeleontidae Latreille, 1802 | Ant lions | 9 | Species | Taxom |
| Myrmosidae Fox, 1894 | Myrmosid Wasps | 7 | Species | Taxom |
| Mythicomyiidae Melander, 1902 | Micro Bee Flies | 7 | Species | Taxom |
| Nabidae Costa, 1852 | Damsel bugs | 7 | Species | Taxom |
| Naibiidae Shcherbakov, 2007 | | 3 | Species | Taxom |
| Nannochoristidae Tillyard, 1917 | | 3 | Species | Taxom |
| Nanosialidae Shcherbakov, 2013 | | 5 | Species | Taxom |
| Naucoridae Leach, 1815 | Creeping water bug | 3 | Species | Taxom |
| Necrotauliidae Handlirsch, 1906 | | 9 | Species | Taxom |
| Necymylacridae Durden, 1969 | | 1 | Species | Taxom |
| Nedubroviidae Bashkuev, 2011 | | 6 | Species | Taxom |
| Nemestrinidae Macquart, 1834 | Tangle-veined flies | 3 | Species | Taxom |
| Nemonychidae Bedel, 1882 | Nemonychid weevils | 16 | Species | Taxom |
| Nemopteridae Rambur, 1842 | Spoonwings | 1 | Species | Taxom |
| Nemouridae Newman, 1853 | Brown stoneflies | 72 | Species | Taxom |
| Nepidae Latreille, 1802 | Back-swimmer Water-boatmen | 6 | Species | Taxom |
| Nepticulidae Stainton, 1854 | Leaf miners | 202 | Species | Taxom |
| Neraphidiidae Aristov, 2014 | | 4 | Species | Taxom |
| Neurochaetidae Mcalpine, 1978 | Upside-Down Flies | 2 | Species | Taxom |
| Nevrorthidae Nakahara, 1958 | | 6 | Species | Taxom |
| Nitidulidae Latreille, 1802 | Nitidules | 388 | Species | Taxom |
| Nocticolidae Bolivar, 1892 | Australian cockroaches | 2 | Species | Taxom |
| Noctuidae Latreille, 1809 | Armyworms | 1949 | Species | Taxom |
| Nogodinidae Melichar, 1898 | | 2 | Species | Taxom |
| Nolidae Hampson, 1894 | Hatted Caterpillars | 89 | Species | Taxom |
| Nosodendridae Erichson, 1846 | Nosodendrid beetles | 1 | Species | Taxom |
| Noteridae C. G. Thomson, 1860 | Burrowing water beetle | 4 | Species | Taxom |
| Notodontidae Stephens, 1829 | Bag Shelter Moths | 161 | Species | Taxom |
| Notonectidae Latreille, 1802 | Back Swimmers | 8 | Species | Taxom |
| Nymphalidae Rafinesque, 1815 | Admirals | 606 | Species | Taxom |
| Nymphidae Rambur, 1842 | Split-footed lacewing | 7 | Species | Taxom |
| Nymphomyiidae Tokunaga, 1932 | Nymphomyiid crane flies | 3 | Species | Taxom |
| Obrieniidae Zherikhin an..., 1994 | | 1 | Species | Taxom |
| Ochodaeidae Mulsant & Rey, 1870 | Sand-loving scarab beetle | 5 | Species | Taxom |
| Odiniidae Hendel, 1920 | Odiniid flies | 10 | Species | Taxom |
| Odontoceridae Wallengren, 1891 | Mortarjoint Casemaker Caddisflies | 6 | Species | Taxom |
| Oecanthidae (Blanchard, 1845) | Tree cricket | 2 | Species | Taxom |
| Oecanthoperlidae Storozhenko, 1988 | | 1 | Species | Taxom |
| Oecophoridae Bruand, 1851 | Concealer Moths | 125 | Species | Taxom |
| Oedemeridae Latreille, 1810 | False Blister Beetle | 18 | Species | Taxom |
| Oedischiidae Handlirsch, 1906 | | 14 | Species | Taxom |
| Oestridae Leach, 1815 | Bot flies | 28 | Species | Taxom |
| Omalisidae Lacordaire, 1857 | | 1 | Species | Taxom |
| Ommatidae Sharp & Muir, 1912 | | 16 | Species | Taxom |
| Ommexechidae Bolivar, 1884 | | 0 | Species | Taxom |
| Opetiidae Rondani, 1856 | Flat-footed flies | 1 | Species | Taxom |
| Opomyzidae (Fallen, 1820) | Opomyzid flies | 13 | Species | Taxom |
| Opostegidae Meyrick, 1893 | Opostegid moths | 12 | Species | Taxom |
| Ormyridae Förster, 1856 | Armyrids | 2 | Species | Taxom |
| Orsodacnidae Thomson, 1859 | Orsodacnid Leaf Beetles | 1 | Species | Taxom |
| Ortheziidae Green, 1896 | Ensign coccids | 11 | Species | Taxom |
| Orthophlebiidae Handlirsch, 1906 | | 19 | Species | Taxom |
| Orussidae Newman, 1834 | Orussid wasps | 5 | Species | Taxom |
| Osmylidae Leach, 1815 | Giant lacewings | 9 | Species | Taxom |
| Otitidae (Macquart, 1835) | Picture-winged flies | 45 | Species | Taxom |
| Oviparosiphidae Shaposhnikov, 1979 | | 7 | Species | Taxom |
| Oxycarenidae Stål, 1862 | | 23 | Species | Taxom |
| Pachygronthidae Stål, 1865 | | 3 | Species | Taxom |
| Pachymeridiidae Handlirsch, 1906 | | 17 | Species | Taxom |
| Pachyneuridae Schiner, 1864 | Dark-winged fungus gnats | 4 | Species | Taxom |
| Palaemerobiidae Martynov, 1928 | | 4 | Species | Taxom |
| Palaeoaphididae Richards, 1966 | | 9 | Species | Taxom |
| Palaeoleontidae Martins-Neto, 1992 | Ant lion | 2 | Species | Taxom |
| Palaeomanteidae Handlirsch, 1906 | | 16 | Species | Taxom |
| Palaeonemouridae N.D. Siniche..., 1987 | | 28 | Species | Taxom |
| Palaeontinidae Handlirsch, 1906 | Giant cicadas | 7 | Species | Taxom |
| Palaeoperlidae Sharov, 1961 | | 9 | Species | Taxom |
| Paleomelittidae Engel, 2001 | | 1 | Species | Taxom |
| Paleuthygrammatidae Carpenter, 1943 | | 3 | Species | Taxom |
| Pallopteridae Loew, 1862 | Flutter flies | 15 | Species | Taxom |
| Pamphagidae Burmeister, 1840 | Toad grasshopper | 7 | Species | Taxom |
| Pamphiliidae Cameron, 1890 | Leaf-rolling sawflies | 65 | Species | Taxom |
| Panorpidae Linnaeus, 1758 | Common scorpionflies | 18 | Species | Taxom |
| Panorpodidae Byers, 1965 | Short-faced scorpionflies | 4 | Species | Taxom |
| Papilionidae Latreille, 1802 | Apollos | 88 | Species | Taxom |
| Parahygrobiidae Ponomarenko, 1977 | Extinct family | 1 | Species | Taxom |
| Paraknightiidae Evans, 1950 | | 1 | Species | Taxom |
| Parasialidae Ponomarenko, 1977 | | 4 | Species | Taxom |
| Paraxymyiidae Rohdendorf, 1946 | Paxylommatid wasps | 1 | Species | Taxom |
| Parmapteridae Aristov & Ra..., 2015 | | 1 | Species | Taxom |
| Pediciidae Osten Sacken, 1860 | Hairy-Eyed Crane Flies | 14 | Species | Taxom |
| Pelecinidae Haliday, 1839 | Ancestral And Modern Pelecinid Wasps | 12 | Species | Taxom |
| Pelecorhynchidae Philip, 1941 | Pelecorhynchid flies | 1 | Species | Taxom |
| Pentatomidae Leach, 1815 | Lesser shield bugs | 73 | Species | Taxom |
| Peradeniidae Naumann & Ma..., 1985 | | 1 | Species | Taxom |
| Pereboriidae Zalessky, 1930 | | 5 | Species | Taxom |
| Perforissidae Shcherbakov, 2007 | | 3 | Species | Taxom |
| Perielytridae Zalessky, 1948 | | 4 | Species | Taxom |
| Perilampidae Latreille, 1809 | Perilampid waps | 5 | Species | Taxom |
| Peripsocidae Roesler, 1944 | Stout Barklice | 6 | Species | Taxom |
| Periscelididae Oldenberg, 1914 | Periscelidid Flies | 1 | Species | Taxom |
| Perissommatidae Colless, 1962 | | 2 | Species | Taxom |
| Perlariopseidae N.D. Siniche..., 1985 | | 12 | Species | Taxom |
| Perlidae (Latreille, 1802) | Common stoneflies | 31 | Species | Taxom |
| Perlodidae Klapálek, 1912 | Perlodid stoneflies | 54 | Species | Taxom |
| Perlopseidae Martynov, 1940 | | 3 | Species | Taxom |
| Permaleurodidae Becker-Migdi..., 1959 | | 1 | Species | Taxom |
| Permaphidopseidae Becker-Migdi..., 1960 | | 2 | Species | Taxom |
| Permarrhaphidae Martynov, 1930 | | 1 | Species | Taxom |
| Permelcanidae Sharov, 1962 | | 8 | Species | Taxom |
| Permelytridae Tillyard, 1931 | | 1 | Species | Taxom |
| Permithonidae Tillyard, 1922 | | 36 | Species | Taxom |
| Permocentropidae Martynov, 1932 | | 1 | Species | Taxom |
| Permochoristidae Tillyard, 1918 | | 159 | Species | Taxom |
| Permocupedidae Martynov, 1933 | | 31 | Species | Taxom |
| Permopanorpidae Tillyard, 1926 | | 5 | Species | Taxom |
| Permopectinidae Aristov, 2005 | | 3 | Species | Taxom |
| Permophasmatidae Gorochov, 1992 | | 4 | Species | Taxom |
| Permosialidae Martynov, 1928 | | 23 | Species | Taxom |
| Permosynidae Tillyard, 1924 | | 12 | Species | Taxom |
| Permotermopsidae Martuinov, 1937 | | 6 | Species | Taxom |
| Permotipulidae Tillyard, 1929 | | 2 | Species | Taxom |
| Permulidae Aristov & St..., 2011 | | 4 | Species | Taxom |
| Phaeomyiidae (Verbeke, 1950) | Marsh flies | 2 | Species | Taxom |
| Phalacridae Leach, 1815 | Shining flower beetles | 3 | Species | Taxom |
| Phalangopsidae (Chopard, 1949) | Spider cricket | 1 | Species | Taxom |
| Phasmatidae Roberts, 1944 | Walking sticks | 2 | Species | Taxom |
| Phasmomimidae Sharov, 1968 | | 17 | Species | Taxom |
| Philopotamidae Stephens, 1829 | Finger Net caddisflies | 26 | Species | Taxom |
| Philopteridae Burmeister, 1830 | | 4 | Species | Taxom |
| Philotarsidae Pearman, 1936 | Loving Barklice | 6 | Species | Taxom |
| Phlaeothripidae Uzel, 1895 | Thrips | 37 | Species | Taxom |
| Phoberoblattidae Durden, 1969 | | 1 | Species | Taxom |
| Phoenicococcidae Stickney, 1934 | Palm scales | 1 | Species | Taxom |
| Phoridae Curtis, 1833 | Coffin Flies | 167 | Species | Taxom |
| Phryganeidae (Leach, 1815) | Giant casemaker | 28 | Species | Taxom |
| Phryganopsychidae Wiggins, 1959 | | 1 | Species | Taxom |
| Phylliidae Redtenbacher, 1906 | Leaf insects | 1 | Species | Taxom |
| Phylloxeridae Herrich-Scha..., 1854 | Phylloxeran Aphids | 1 | Species | Taxom |
| Phyloblattidae Schneider, 1983 | | 5 | Species | Taxom |
| Pieridae Duponchel, 1835 | And Sulphurs | 108 | Species | Taxom |
| Piesmatidae Amyot & Audi..., 1843 | Ash grey leaf bug | 11 | Species | Taxom |
| Pinideliidae Storozhenko, 1997 | | 2 | Species | Taxom |
| Piophilidae Macquart, 1835 | Cheese flies | 5 | Species | Taxom |
| Pipunculidae Walker, 1834 | Big headed flies | 110 | Species | Taxom |
| Pityococcidae Mckenzie, 1942 | | 1 | Species | Taxom |
| Plataspidae (Dallas, 1851) | | 0 | Species | Taxom |
| Plataspididae (Dallas, 1851) | | 2 | Species | Taxom |
| Platygastridae Haliday, 1833 | Platygastrid wasps | 7 | Species | Taxom |
| Platyperlidae Sinitshenkova, 1982 | | 4 | Species | Taxom |
| Platypezidae Fallen, 1815 | Flat footed flies | 62 | Species | Taxom |
| Platystomatidae Schiner, 1862 | Picture-winged flies | 13 | Species | Taxom |
| Pleciofungivoridae Rohdendorf, 1946 | | 40 | Species | Taxom |
| Pleciomimidae Rodendorf, 1949 | | 6 | Species | Taxom |
| Pleidae Fieber, 1817 | Pigmy backswimmers | 1 | Species | Taxom |
| Pleocomidae LeConte, 1861 | Rain beetle | 1 | Species | Taxom |
| Plokiophilidae China, 1953 | Spider web bug | 1 | Species | Taxom |
| Plutellidae Guenée, 1845 | Diamond-back moths | 73 | Species | Taxom |
| Podoscirtidae Saussure, 1878 | | 6 | Species | Taxom |
| Polycentropodidae Ulmer, 1903 | Tube Maker Caddisflies | 63 | Species | Taxom |
| Pompilidae Latreille, 1805 | Pompilid wasps | 81 | Species | Taxom |
| Poroblattinidae Handlirsch, 1906 | | 5 | Species | Taxom |
| Praeaulacidae Rasnitsyn, 1972 | | 8 | Species | Taxom |
| Praeichneumonidae Rasnitsyn, 1983 | | 4 | Species | Taxom |
| Praesiricidae Rasnitsyn, 1968 | | 2 | Species | Taxom |
| Probnidae Sellards, 1909 | | 1 | Species | Taxom |
| Procercopidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Procramptonomyiidae Kovalev, 1985 | | 2 | Species | Taxom |
| Proctorenyxidae Lelej & Kozlov, 1999 | | 1 | Species | Taxom |
| Proctotrupidae Latreille, 1802 | Proctotrupid wasps | 8 | Species | Taxom |
| Prodoxidae Riley, 1881 | Yucca Moths | 17 | Species | Taxom |
| Proedischiidae Pinto & Orne..., 1978 | | 5 | Species | Taxom |
| Progonocimicidae Handlirsch, 1906 | | 11 | Species | Taxom |
| Prohemerobiidae Handlirsch, 1906 | | 4 | Species | Taxom |
| Proneottiophilidae Hennig, 1969 | | 1 | Species | Taxom |
| Proparagryllacrididae Riek, 1956 | | 1 | Species | Taxom |
| Prophalangopsidae Saussure, 1878 | Grigs | 14 | Species | Taxom |
| Prorhyacophilidae Riek, 1955 | | 1 | Species | Taxom |
| Prosbolidae Handlirsch, 1906 | | 85 | Species | Taxom |
| Prosbolopseidae Becker-Migdi..., 1946 | | 16 | Species | Taxom |
| Prostomidae C. G. Thomson, 1859 | Jugular-horned beetle | 2 | Species | Taxom |
| Protembiidae Tillyard, 1937 | | 19 | Species | Taxom |
| Protodiplatyidae Martynov, 1925 | | 1 | Species | Taxom |
| Protogryllidae Zeuner, 1937 | | 1 | Species | Taxom |
| Protomeropidae Tillyard, 1926 | | 2 | Species | Taxom |
| Protopleciidae Rohdendorf, 1946 | | 5 | Species | Taxom |
| Protopsyllidiidae Becker-Migdi..., 1960 | | 2 | Species | Taxom |
| Protorhyphidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Protoxenidae Pohl, Beutel..., 2005 | | 1 | Species | Taxom |
| Pruvostitidae Zalessky, 1929 | | 19 | Species | Taxom |
| Prygidae Aristov & Ra..., 2014 | | 1 | Species | Taxom |
| Psephenidae Lacordaire, 1854 | Water pennies | 2 | Species | Taxom |
| Pseudelcanidae Gorochov, 1987 | | 2 | Species | Taxom |
| Pseudocaeciliidae Pearman, 1936 | False Lizard Barklice | 2 | Species | Taxom |
| Pseudococcidae Heymons, 1915 | Mealy Bugs | 120 | Species | Taxom |
| Pseudonannochoristidae Novokshonov, 1994 | | 2 | Species | Taxom |
| Pseudophasmatidae Kirby, 1896 | Striped Walkingsticks | 2 | Species | Taxom |
| Pseudophyllodromiidae Hebard, 1929 | | 6 | Species | Taxom |
| Pseudopomyzidae (Mcalpine, 1966) | Banana flies | 3 | Species | Taxom |
| Pseudosiricidae Handlirsch, 1908 | | 1 | Species | Taxom |
| Psilidae Macquart, 1835 | Carrot flies | 58 | Species | Taxom |
| Psocidae Samouelle, 1819 | Common bark louse | 32 | Species | Taxom |
| Psocidiidae Tillyard, 1926 | | 2 | Species | Taxom |
| Psychidae Boisduval, 1828 | Bagmoths | 106 | Species | Taxom |
| Psychodidae Newman, 1834 | Drain flies | 99 | Species | Taxom |
| Psychomyiidae Walker, 1852 | Net Tube Caddisflies | 19 | Species | Taxom |
| Psychopsidae Handlirsch, 1906 | Silky lacewing | 11 | Species | Taxom |
| Psyllidae Latreille, 1807 | Jumping plant lice | 155 | Species | Taxom |
| Psyllipsocidae Enderlein, 1903 | Cave Barklice | 3 | Species | Taxom |
| Pteromalidae Dalman, 1820 | Pteromalid wasps | 66 | Species | Taxom |
| Pteronarcyidae Enderlein, 1909 | Giant stoneflies | 2 | Species | Taxom |
| Pterophoridae Zeller, 1841 | Plume Moths | 243 | Species | Taxom |
| Ptiliidae Heer, 1843 | Feather-wing beetles | 94 | Species | Taxom |
| Ptilodactylidae Laporte, 1836 | Ptilodactylid beetles | 4 | Species | Taxom |
| Ptinidae Latreille, 1802 | Death-watch and Spider Beetles | 54 | Species | Taxom |
| Ptychopteridae Osten Sacken, 1862 | Phantom crane flies | 33 | Species | Taxom |
| Pulicidae Billberg, 1820 | Cat fleas | 7 | Species | Taxom |
| Putoidae Beardsley, 1969 | Giant mealybugs | 10 | Species | Taxom |
| Pygidicranidae (Verhoeff, 1902) | | 0 | Species | Taxom |
| Pygiopsyllidae Wagner, 1939 | | 1 | Species | Taxom |
| Pyralidae Latreille, 1802 | Flour Moths | 487 | Species | Taxom |
| Pyrgomorphidae Brunner von ..., 1874 | Bushlocusts | 1 | Species | Taxom |
| Pyrgotidae Schiner, 1868 | Light Flies | 1 | Species | Taxom |
| Pyrochroidae Latreille, 1807 | Cardinal beetles | 9 | Species | Taxom |
| Pyrrhocoridae Dohrn, 1859 | Cotton stainers | 1 | Species | Taxom |
| Pythidae Solier, 1834 | Dead log bark beetles | 2 | Species | Taxom |
| Rangomaramidae Jaschhof & D..., 2002 | | 3 | Species | Taxom |
| Raphidiidae Latreille, 1810 | Raphidiid snakeflies | 1 | Species | Taxom |
| Raphidiomimidae Vishniakova, 1973 | | 3 | Species | Taxom |
| Rasnitsynaphididae Homan & Wegi..., 2011 | | 3 | Species | Taxom |
| Reduviidae Latreille, 1807 | Assassin and thread-legged bugs | 20 | Species | Taxom |
| Retinaphididae Heie, 2000 | | 2 | Species | Taxom |
| Rhagionempididae Rohdendorf, 1938 | | 3 | Species | Taxom |
| Rhagionidae Latreille, 1802 | Snipe flies | 97 | Species | Taxom |
| Rhaphidophoridae Walker, 1869 | And Cave Weta | 11 | Species | Taxom |
| Rhinophoridae Robineau-Des..., 1863 | Woodlouse flies | 8 | Species | Taxom |
| Rhinotermitidae Froggatt, 1897 | Subterranean termites | 7 | Species | Taxom |
| Rhipiphoridae Gemminger & ..., 1870 | Hump back beetles | 3 | Species | Taxom |
| Rhizoecidae Williams, 1969 | | 4 | Species | Taxom |
| Rhombocoleidae Rohdendorf, 1961 | | 23 | Species | Taxom |
| Rhopalidae Amyot & Serv..., 1843 | Rhopalid Bugs | 23 | Species | Taxom |
| Rhopalopsyllidae Oudemans, 1909 | Marsupial fleas | 1 | Species | Taxom |
| Rhynchitidae Gistel, 1848 | Leaf-rolling weevils | 2 | Species | Taxom |
| Rhyparochromidae Amyot & Serv..., 1843 | Dirt-colored Seed Bugs | 137 | Species | Taxom |
| Ricaniidae Amyot & Audi..., 1843 | | 2 | Species | Taxom |
| Riodinidae Grote, 1895 | Metalmark Butterflies | 16 | Species | Taxom |
| Ripiphoridae Gemminger & ..., 1870 | Rhipiphoridae | 3 | Species | Taxom |
| Robinjohniidae Martynova, 1948 | | 1 | Species | Taxom |
| Roeslerstammiidae Bruand, 1850 | Double-eye moths | 2 | Species | Taxom |
| Romaleidae Brunner von ..., 1893 | Lubber grasshopper | 1 | Species | Taxom |
| Ropalomeridae Linder, 1930 | Ropalomerid flies | 1 | Species | Taxom |
| Roproniidae Bradley, 1905 | Roproniid wasps | 2 | Species | Taxom |
| Rutelidae (MacLeay, 1819) | | 3 | Species | Taxom |
| Saldidae Amyot and Se..., 1843 | Shore bug | 19 | Species | Taxom |
| Salpingidae Leach, 1815 | Narrow-waisted bark beetle | 26 | Species | Taxom |
| Sapygidae Latreille, 1810 | Club-horned wasps | 1 | Species | Taxom |
| Sarcophagidae Macquart, 1834 | Flesh flies | 103 | Species | Taxom |
| Saturniidae Boisduval, 1837 | And Giant Silk Moths | 29 | Species | Taxom |
| Saurophthiridae Ponomarenko, 1986 | | 1 | Species | Taxom |
| Scalicidae Kukalová, 1964 | | 1 | Species | Taxom |
| Scarabaeidae Latreille, 1802 | Dung beetles | 749 | Species | Taxom |
| Scathophagidae Robineau-Des..., 1830 | Dung flies | 118 | Species | Taxom |
| Scatopsidae Newman, 1834 | Dung midges | 23 | Species | Taxom |
| Scelionidae Haliday, 1839 | Scelionid wasps | 204 | Species | Taxom |
| Scenopinidae Burmeister, 1835 | Window Flies | 5 | Species | Taxom |
| Schizoblattidae Durden, 1969 | | 1 | Species | Taxom |
| Schizocoleidae Rohdendorf, 1961 | | 68 | Species | Taxom |
| Schizophoridae Ponomarenko, 1968 | | 2 | Species | Taxom |
| Schizopteridae Reuter, 1891 | Jumping ground bugs | 1 | Species | Taxom |
| Schreckensteiniidae Fletcher, 1929 | Bristle Legged Moths | 1 | Species | Taxom |
| Sciaridae Billberg, 1820 | Black fungus gnats | 7 | Species | Taxom |
| Sciomyzidae Fallen, 1820 | Marsh Flies | 76 | Species | Taxom |
| Scirtidae Fleming, 1821 | Marsh Beetle | 65 | Species | Taxom |
| Scoliidae Leach, 1815 | Mammoth wasps | 6 | Species | Taxom |
| Scraptiidae Mulsant, 1856 | Antlike leaf beetles | 25 | Species | Taxom |
| Scutelleridae Leach, 1815 | Jewel bugs | 8 | Species | Taxom |
| Scydmaenidae (Leach, 1815) | Ant-like stone beetles | 176 | Species | Taxom |
| Scythrididae Rebel, 1901 | Flower Moths | 4 | Species | Taxom |
| Scytinopteridae Handlirsch, 1906 | | 23 | Species | Taxom |
| Sepsidae Walker, 1833 | Black scavenger flies | 34 | Species | Taxom |
| Sepulcidae Rasnitsyn, 1968 | | 20 | Species | Taxom |
| Serafinidae Koteja, 2008 | | 1 | Species | Taxom |
| Sericostomatidae Stephens, 1836 | Bushtailed Caddisflies | 7 | Species | Taxom |
| Serphitidae Brues, 1937 | | 4 | Species | Taxom |
| Sesiidae Boisduval, 1828 | Clear Wings | 97 | Species | Taxom |
| Shaposhnikoviidae Kononova, 1976 | | 6 | Species | Taxom |
| Sheimiidae Martynova, 1958 | | 7 | Species | Taxom |
| Shurabellidae Popov, 1971 | | 1 | Species | Taxom |
| Sialidae Leach, 1815 | Alderflies | 6 | Species | Taxom |
| Sialidopsidae Zalesskii, 1926 | | 5 | Species | Taxom |
| Siberhyphidae Kovalev, 1985 | | 1 | Species | Taxom |
| Siberioperlidae Sinitshenkova, 1983 | | 12 | Species | Taxom |
| Sibiriothaumatidae Sukatcheva &..., 1998 | | 1 | Species | Taxom |
| Silphidae Latreille, 1807 | Burying And Carrion Beetles | 73 | Species | Taxom |
| Silvanidae Kirby, 1837 | Flat bark beetles | 13 | Species | Taxom |
| Simuliidae Newman, 1834 | Black flies | 275 | Species | Taxom |
| Siricidae Billberg, 1820 | Horntail | 23 | Species | Taxom |
| Sisyridae Handlirsch, 1908 | Spongeflies | 7 | Species | Taxom |
| Skaliciidae Kukalová, 1964 | | 4 | Species | Taxom |
| Sojanocoleidae Martynov, 1932 | | 1 | Species | Taxom |
| Sojanoraphidiidae Martynova, 1952 | | 3 | Species | Taxom |
| Solenoptilidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Soyaniidae Shcherbakov, 2015 | | 1 | Species | Taxom |
| Soyanopteridae Aristov & Ra..., 2011 | | 3 | Species | Taxom |
| Spanioderidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Sphaeritidae Schuckard, 1839 | False clown beetle | 1 | Species | Taxom |
| Sphaeriusidae Erichson, 1845 | Minute Bog Beetles | 2 | Species | Taxom |
| Sphaeroceridae Macquart, 1835 | Dung flies | 42 | Species | Taxom |
| Sphaeropsocidae Kolbe, 1883 | | 1 | Species | Taxom |
| Sphecidae Latreille, 1802 | Digger & Sand wasps | 15 | Species | Taxom |
| Sphindidae Jacquelin du..., 1860 | Cryptic slime mold beetle | 5 | Species | Taxom |
| Sphingidae Latreille, 1802 | Hawk Moths | 105 | Species | Taxom |
| Spiloblattidae Handlirsch, 1904 | | 3 | Species | Taxom |
| Spiloblattinidae Handlirsch, 1906 | | 18 | Species | Taxom |
| Staphylinidae Lameere, 1900 | Rove beetles | 2692 | Species | Taxom |
| Steingeliidae Morrison, 1927 | | 1 | Species | Taxom |
| Stenopelmatidae Burmeister, 1838 | Bulldog Raspy Crickets | 1 | Species | Taxom |
| Stenopsocidae Pearman, 1936 | Narrow Barklice | 7 | Species | Taxom |
| Stenopsychidae Martynov, 1924 | | 4 | Species | Taxom |
| Stenotrachelidae C. G. Thomson, 1859 | False long-horned beetles | 3 | Species | Taxom |
| Stephanidae Leach, 1815 | Crown wasp | 8 | Species | Taxom |
| Stigmaphronidae Kozlov, 1975 | Stigmaphronid wasps | 5 | Species | Taxom |
| Strashilidae Rasnitsyn, 1992 | | 1 | Species | Taxom |
| Stratiomyidae Latreille, 1802 | Soldier flies | 121 | Species | Taxom |
| Streblidae (Kolenati, 1863) | Bat flies | 1 | Species | Taxom |
| Strongylophthalmyiidae Hennig, 1940 | Strongylophthalmyiid flies | 5 | Species | Taxom |
| Stylopidae Kirby, 1813 | Strepsiptera | 2 | Species | Taxom |
| Surijokocixiidae Shcherbakov, 2000 | | 4 | Species | Taxom |
| Surijokopsocidae Becker-Migdi..., 1961 | | 1 | Species | Taxom |
| Sylvabestiidae Aristov, 2000 | | 15 | Species | Taxom |
| Sylvaphlebiidae Martynov, 1940 | | 4 | Species | Taxom |
| Synomaloptilidae Martynov, 1938 | | 1 | Species | Taxom |
| Synteliidae Lewis, 1882 | | 1 | Species | Taxom |
| Syrphidae Latreille, 1802 | Drone flies | 1018 | Species | Taxom |
| Szelegiewicziidae Wegierek, 1989 | | 1 | Species | Taxom |
| Tabanidae Latreille, 1802 | Breeze flies | 119 | Species | Taxom |
| Tachinidae (Robineau-Des..., 1830) | Bristle Flies | 562 | Species | Taxom |
| Taeniopterygidae Klapálek, 1905 | Taeniopterygid winter stoneflies | 32 | Species | Taxom |
| Taimyrocoridae Popov, 2016 | | 1 | Species | Taxom |
| Tajmyraphididae Kononova, 1975 | | 3 | Species | Taxom |
| Taldycupedidae Rohdendorf, 1961 | | 18 | Species | Taxom |
| Tanaostigmatidae Howard, 1890 | Tanaostigmatid wasps | 1 | Species | Taxom |
| Tanyderidae Alexander, 1919 | Primitive crane flies | 9 | Species | Taxom |
| Tanypezidae Rondani, 1856 | Stretched-foot flies | 1 | Species | Taxom |
| Taymyrelectronidae Botosaneanu ..., 1983 | | 1 | Species | Taxom |
| Tcholmanvissiidae Zalessky, 1934 | | 5 | Species | Taxom |
| Tenebrionidae Latreille, 1802 | Darkling Beetle | 118 | Species | Taxom |
| Tenthredinidae Latreille, 1804 | Common sawflies | 818 | Species | Taxom |
| Tephritidae Newman, 1834 | Fruit flies | 179 | Species | Taxom |
| Termitidae Latreille, 1802 | Higher termites | 2 | Species | Taxom |
| Termopsidae Grassé, 1949 | Damp wood termite | 2 | Species | Taxom |
| Tethinidae (Hendel, 1916) | Tethinid flies | 1 | Species | Taxom |
| Tetracampidae Förster, 1856 | Tetracampid wasps | 1 | Species | Taxom |
| Tetratomidae Billberg, 1820 | Polypore fungus beetle | 7 | Species | Taxom |
| Tetrigidae Rambur, 1838 | Groundhoppers | 18 | Species | Taxom |
| Tettigarctidae Distant, 1905 | Hairy cicada | 1 | Species | Taxom |
| Tettigometridae Germar, 1821 | | 3 | Species | Taxom |
| Tettigoniidae Krauss, 1902 | Bush crickets | 94 | Species | Taxom |
| Tettoedischiidae Gorochov, 1987 | | 3 | Species | Taxom |
| Thaumaleidae Bezzi, 1913 | Solitary midges | 1 | Species | Taxom |
| Thaumastocoridae Kirkaldy, 1908 | Palm bug | 2 | Species | Taxom |
| Therevidae Newman, 1834 | Stiletto flies | 112 | Species | Taxom |
| Thripidae Stevens, 1829 | Common thrips | 77 | Species | Taxom |
| Throscidae Laporte, 1840 | False metallic wood-boring beetles | 7 | Species | Taxom |
| Thyrididae Herrich-Schä..., 1846 | Picture Winged Leaf Moths | 11 | Species | Taxom |
| Tillyardembiidae Zalessky, 1938 | | 7 | Species | Taxom |
| Tineidae Latreille, 1810 | & Allies | 191 | Species | Taxom |
| Tingidae Laporte, 1832 | Lace bug | 145 | Species | Taxom |
| Tiphiidae Leach, 1815 | Flower wasps | 2 | Species | Taxom |
| Tipulidae Latreille, 1802 | Crane Flies | 1202 | Species | Taxom |
| Tischeriidae Spuler, 1898 | Lyonetiid moths | 17 | Species | Taxom |
| Tococladidae Carpenter, 1966 | | 3 | Species | Taxom |
| Tomiidae Martynov, 1936 | | 1 | Species | Taxom |
| Tomiochoristidae Martynova, 1958 | | 6 | Species | Taxom |
| Tortricidae Latreille, 1803 | Bell Moths | 1360 | Species | Taxom |
| Torymidae Walker, 1833 | Apple seed chalcids | 19 | Species | Taxom |
| Trachypachidae C. G. Thomson, 1857 | False ground beetle | 23 | Species | Taxom |
| Triaplidae Ponomarenko, 1977 | Extinct family | 1 | Species | Taxom |
| Triassoblattidae Durden, 1969 | | 1 | Species | Taxom |
| Trichoceridae Rondani, 1841 | Winter Crane Flies | 60 | Species | Taxom |
| Trichogrammatidae Haliday, 1851 | Trichogrammatid wasps | 18 | Species | Taxom |
| Trichopsocidae Pearman, 1936 | Lash-faced psocid | 3 | Species | Taxom |
| Tricoleidae (Ponomarenko, 1969) | | 7 | Species | Taxom |
| Tridactylidae Saussure, 1874 | Pygmy mole cricket | 7 | Species | Taxom |
| Trigonalidae (Cresson, 1887) | Trigonalid sawflies | 2 | Species | Taxom |
| Trigonalyidae | | 1 | Species | Taxom |
| Trigonidiidae (Saussure, 1870) | And Ground Crickets | 12 | Species | Taxom |
| Triozidae Löw, 1879 | Jumping plant lice | 38 | Species | Taxom |
| Trogidae (MacLeay, 1819) | Gnawer beetles | 28 | Species | Taxom |
| Trogiidae Enderlein, 1903 | Granary Booklice | 7 | Species | Taxom |
| Trogossitidae Latreille, 1802 | Bark gnawing beetle | 18 | Species | Taxom |
| Tropiduchidae Stål, 1866 | Tropiduchid Planthoppers | 6 | Species | Taxom |
| Tshekarchiereidae Novokshonov, 1997 | | 1 | Species | Taxom |
| Tshekardocoleidae Rohdendorf, 1944 | | 7 | Species | Taxom |
| Tshekardoperlidae N.D. Siniche..., 1987 | | 5 | Species | Taxom |
| Tunguskapteridae Storozhenko ..., 1995 | | 1 | Species | Taxom |
| Ulidiidae Macquart, 1835 | Picture-winged Flies | 1 | Species | Taxom |
| Ulopidae (Le Peletier ..., 1825) | | 1 | Species | Taxom |
| Ulyanidae (Zherikhin, 1993) | | 1 | Species | Taxom |
| Umenocoleidae Chen & Tian, 1973 | | 1 | Species | Taxom |
| Undopterigidae (Kozlov, 1988) | | 1 | Species | Taxom |
| Uninervidae Becker-Migdi..., 1951 | | 1 | Species | Taxom |
| Uraloptysmatidae (VD Ivanov, 1992) | | 1 | Species | Taxom |
| Uraniidae Blanchard, 1845 | Swallowtail Moths | 11 | Species | Taxom |
| Urodidae Kyrki, 1984 | False Burnet Moths | 1 | Species | Taxom |
| Vanhorniidae Crawford, 1909 | Vanhorniid wasps | 1 | Species | Taxom |
| Veliidae Amyot & Serv..., 1843 | Broad-shouldered bugs | 4 | Species | Taxom |
| Vermipsyllidae Wagner, 1889 | Carnivore fleas | 13 | Species | Taxom |
| Vesperidae Mulsant, 1839 | Vesperid longicorn beetles | 2 | Species | Taxom |
| Vespidae Leach, 1815 | And Allies | 114 | Species | Taxom |
| Vitimiidae Sharov, 1968 | | 2 | Species | Taxom |
| Vitimotauliidae Sukatsheva, 1968 | | 13 | Species | Taxom |
| Weitschatidae Koteja, 2008 | | 2 | Species | Taxom |
| Xenoblattidae Durden, 1969 | | 5 | Species | Taxom |
| Xiphydriidae Leach, 1819 | Wood wasps | 14 | Species | Taxom |
| Xyelidae Newman, 1835 | Sawfly | 35 | Species | Taxom |
| Xyelotomidae Rasnitsyn, 1968 | | 6 | Species | Taxom |
| Xyelydidae Rasnitsyn, 1968 | | 1 | Species | Taxom |
| Xylococcidae (Pergrande, 1898) | | 5 | Species | Taxom |
| Xylomyidae Verrall, 1901 | Wood soldier flies | 12 | Species | Taxom |
| Xylophagidae Fallen, 1810 | Awl-flies | 28 | Species | Taxom |
| Xyloryctidae Meyrick, 1890 | Flower Moths | 103 | Species | Taxom |
| Yantarocentridae Ivanov & Mel..., 2015 | | 1 | Species | Taxom |
| Yponomeutidae Stephens, 1829 | Ermine Moths | 120 | Species | Taxom |
| Ypsolophidae Guenée, 1845 | Ypsolophid Moths | 57 | Species | Taxom |
| Zopheridae Solier, 1834 | Cylindrical bark beetles | 26 | Species | Taxom |
| Zygaenidae Latreille, 1809 | Burnet Forester | 108 | Species | Taxom |
