| Acanaloniidae Amyot and Se..., 1843 | Acanalonid planthoppers | 20 | Species | Taxom |
| Acanthopidae Burmeister, 1838 | | 86 | Species | Taxom |
| Acanthosomatidae Signoret, 1864 | Acanthosomatids | 4 | Species | Taxom |
| Acartophthalmidae Czerny, 1928 | Acartophthalmid flies | 1 | Species | Taxom |
| Achilidae Stål, 1866 | Achilid Planthoppers | 39 | Species | Taxom |
| Aclerdidae Ferris, 1937 | Aclerdid scales | 5 | Species | Taxom |
| Acrididae MacLeay, 1819 | Grasshoppers and locusts | 1149 | Species | Taxom |
| Acroceridae Leach, 1815 | Hunch-back flies | 44 | Species | Taxom |
| Adelgidae Heinze, 1962 | Adelgids | 3 | Species | Taxom |
| Adelidae Bruand, 1851 | Adelid Moths | 32 | Species | Taxom |
| Aderidae Winkler, 1927 | Ant-like leaf beetles | 67 | Species | Taxom |
| Aeolothripidae Uzel, 1895 | Banded thrips | 12 | Species | Taxom |
| Aerophasmidae Martynov, 1928 | | 1 | Species | Taxom |
| Aeschnidiidae Needham, 1903 | Small darner | 2 | Species | Taxom |
| Aeshnidae Rambur, 1842 | Darners | 110 | Species | Taxom |
| Aetalionidae Spinola, 1850 | Treehopper | 31 | Species | Taxom |
| Agaonidae Walker, 1848 | Fig wasp | 26 | Species | Taxom |
| Agathemeridae Bradler, 2003 | | 1 | Species | Taxom |
| Agromyzidae Fallen, 1823 | Leaf miner flies | 264 | Species | Taxom |
| Aididae Schaus, 1906 | | 10 | Species | Taxom |
| Alexiidae Imhoff, 1856 | Minute bark beetles | 1 | Species | Taxom |
| Aleyrodidae Westwood, 1840 | Whiteflies | 179 | Species | Taxom |
| Alucitidae Leach, 1815 | Many Plumed Moths | 20 | Species | Taxom |
| Alydidae Amyot & Serv..., 1843 | Bean bugs | 21 | Species | Taxom |
| Amorphoscelidae Stål, 1877 | | 1 | Species | Taxom |
| Amphientomidae Enderlein, 1903 | Tropical Barklice | 9 | Species | Taxom |
| Amphipsocidae Mockford, 1978 | Hairy-winged Barklice | 21 | Species | Taxom |
| Amphipterygidae Selys, 1853 | | 3 | Species | Taxom |
| Ampulicidae Shuckard, 1840 | Ampulicid wasps | 7 | Species | Taxom |
| Andesembiidae Ross, 2003 | | 7 | Species | Taxom |
| Andrenidae Webster, 1913 | Andrenid bees | 135 | Species | Taxom |
| Angarosphecidae Rasnitsyn, 1975 | | 0 | Species | Taxom |
| Anisembiidae Davis, 1940 | | 49 | Species | Taxom |
| Anisolabididae Verhoeff, 1902 | | 20 | Species | Taxom |
| Anisopodidae Knab, 1912 | Window Midges | 35 | Species | Taxom |
| Anomalopsychidae Flint, 1981 | | 20 | Species | Taxom |
| Anormochoristidae Tillyard, 1926 | | 1 | Species | Taxom |
| Anostostomatidae Saussure, 1859 | Wetas & King Crickets | 23 | Species | Taxom |
| Anthelidae Turner, 1904 | Australian Lappet Moths | 8 | Species | Taxom |
| Anthicidae Latreille, 1819 | Ant beetles | 54 | Species | Taxom |
| Anthocoridae Fieber, 1837 | Flower bugs | 9 | Species | Taxom |
| Anthomyiidae Robineau-Des..., 1830 | Anthomyiid flies | 51 | Species | Taxom |
| Anthomyzidae Czerny, 1903 | Anthomyzid flies | 3 | Species | Taxom |
| Anthophoridae (C. L. Koch, 1846) | | 1 | Species | Taxom |
| Anthracoblattinidae Durden, 1969 | | 1 | Species | Taxom |
| Anthribidae Billberg, 1820 | Fungus Weevil | 344 | Species | Taxom |
| Apatelodidae Neumoegen & ..., 1894 | American Silkworm Moths | 10 | Species | Taxom |
| Aphalaridae Löw, 1879 | | 25 | Species | Taxom |
| Aphelinidae Thomson, 1876 | Aphelinid wasps | 70 | Species | Taxom |
| Aphididae Latreille, 1802 | Aphids | 96 | Species | Taxom |
| Aphodiidae Leach, 1815 | | 4 | Species | Taxom |
| Aphrophoridae Evans, 1946 | Froghoppers | 22 | Species | Taxom |
| Apidae Latreille, 1802 | Bumble bees | 1306 | Species | Taxom |
| Aradidae Spinola, 1837 | Flat bug | 102 | Species | Taxom |
| Araripeblattidae Martins-Neto..., 2010 | | 8 | Species | Taxom |
| Araripechlorogomphidae Bechly & Ueda, 2002 | | 1 | Species | Taxom |
| Araripelibellulidae Bechly, 1996 | | 3 | Species | Taxom |
| Araripeneuridae Martins-Neto..., 1989 | | 7 | Species | Taxom |
| Araripephlebiidae Bechly, 1998 | | 1 | Species | Taxom |
| Archembiidae Ross, 2001 | | 17 | Species | Taxom |
| Archeocrypticidae Kaszab, 1964 | Ancient Fungus Beetles | 2 | Species | Taxom |
| Archimylacridae Handlirsch, 1906 | | 5 | Species | Taxom |
| Archipsocidae Enderlein, 1903 | Ancient Barklice | 34 | Species | Taxom |
| Arctiidae Leach, 1815 | Footman moths | 513 | Species | Taxom |
| Argidae Konow, 1890 | Argid flies | 69 | Species | Taxom |
| Artematopodidae Lacordaire, 1857 | Soft bodied plant beetle | 10 | Species | Taxom |
| Ascalaphidae Rambur, 1842 | Owlflies | 27 | Species | Taxom |
| Aschiphasmatidae Brunner von ..., 1893 | | 1 | Species | Taxom |
| Asilidae Latreille, 1802 | Assassin flies | 1150 | Species | Taxom |
| Asiopsocidae Mockford & G..., 1976 | | 5 | Species | Taxom |
| Asteiidae Rondani, 1856 | Asteiid Flies | 19 | Species | Taxom |
| Asterolecaniidae Cockerell, 1896 | Asterolecaniids | 8 | Species | Taxom |
| Athericidae Stuckenberg, 1973 | Athericid flies | 5 | Species | Taxom |
| Attelabidae Billberg, 1820 | Leaf Rolling Weevil | 310 | Species | Taxom |
| Aulacidae Shuckard, 1842 | Aulacid wasps | 10 | Species | Taxom |
| Aulacigastridae Wollaston, 1864 | Aulacigastrid flies | 25 | Species | Taxom |
| Austroleptidae Nagatomi, 1982 | | 2 | Species | Taxom |
| Austropetaliidae Carle & Louton, 1994 | Redspot Dragonflies | 1 | Species | Taxom |
| Autostichidae Le Marchand, 1947 | Autostichid Moths | 16 | Species | Taxom |
| Babinskaiidae Martins-Neto..., 1989 | | 4 | Species | Taxom |
| Baetidae Leach, 1815 | Mayflies | 149 | Species | Taxom |
| Baetiscidae Banks, 1900 | Armored Mayflies | 1 | Species | Taxom |
| Bahiaxenidae Bravo, Pohl,..., 2009 | | 1 | Species | Taxom |
| Baissogryllidae Gorochov, 1985 | | 19 | Species | Taxom |
| Baissopteridae Martynova, 1961 | | 5 | Species | Taxom |
| Batrachedridae Heinemann & ..., 1876 | Batrachedrid Moths | 6 | Species | Taxom |
| Beesoniidae Ferris, 1950 | Beesoniids | 5 | Species | Taxom |
| Belidae Schönherr, 1826 | Belid Beetle | 26 | Species | Taxom |
| Belostomatidae Leach, 1815 | Alligator ticks | 76 | Species | Taxom |
| Berothidae Handlirsch, 1906 | Beaded lacewing | 5 | Species | Taxom |
| Berytidae Fieber, 1851 | Stilt bug | 40 | Species | Taxom |
| Bethylidae Halliday, 1839 | Bethylid wasps | 359 | Species | Taxom |
| Bibionidae Fleming, 1821 | Bibionid flies | 113 | Species | Taxom |
| Biphyllidae LeConte, 1861 | Biphyllid beetles | 3 | Species | Taxom |
| Bittacidae Handlirsch, 1906 | Hanging scorpionflies | 40 | Species | Taxom |
| Blaberidae Saussure, 1864 | Blaberids | 342 | Species | Taxom |
| Blastobasidae (Meyrick, 1894) | Blastobasid moths | 0 | Species | Taxom |
| Blattellidae (Karny, 1908) | German Cockroach | 284 | Species | Taxom |
| Blattidae Stephens, 1829 | American cockroaches | 49 | Species | Taxom |
| Blattulidae Vishnyokova, 1982 | | 4 | Species | Taxom |
| Blephariceridae Loew, 1861 | Mountain midges | 51 | Species | Taxom |
| Blissidae Stål, 1862 | Chinch Bugs | 47 | Species | Taxom |
| Bohartillidae Kinzelbach, 1969 | | 1 | Species | Taxom |
| Bombycidae Latreille, 1802 | Lappet moths | 231 | Species | Taxom |
| Bombyliidae Latreille, 1802 | Bee Flies | 257 | Species | Taxom |
| Boopiidae Mjöberg, 1910 | | 2 | Species | Taxom |
| Boreidae Latreille, 1816 | Snow fleas | 1 | Species | Taxom |
| Bostrichidae Latreille, 1802 | Auger beetles | 103 | Species | Taxom |
| Bothrideridae Erichson, 1845 | Cocoon-forming beetles | 5 | Species | Taxom |
| Bouretidae Martins-Neto, 2001 | | 1 | Species | Taxom |
| Brachodidae Agenjo, 1966 | Little Bear Moths | 18 | Species | Taxom |
| Brachycentridae Ulmer, 1903 | Humpless Casemaker Caddisflies | 1 | Species | Taxom |
| Brachyceridae (Billberg, 1820) | Brachycerids | 1 | Species | Taxom |
| Braconidae Latreille, 1829 | Braconid wasps | 449 | Species | Taxom |
| Brassolidae (Boisduval, 1836) | | 3 | Species | Taxom |
| Braulidae Egger, 1853 | Bee lice | 2 | Species | Taxom |
| Brentidae Billberg, 1820 | Brenthidae | 162 | Species | Taxom |
| Buprestidae Leach, 1815 | Flat-headed wood-borers | 604 | Species | Taxom |
| Byrrhidae Latreille, 1804 | Moss beetles | 5 | Species | Taxom |
| Caeciliusidae Kolbe, 1880 | Lizard Barklice | 48 | Species | Taxom |
| Caenidae Newman, 1853 | Small square-gill mayflies | 27 | Species | Taxom |
| Calamoceratidae Ulmer, 1905 | | 60 | Species | Taxom |
| Caliscelidae Amyot & Serv..., 1843 | Piglet Bugs | 4 | Species | Taxom |
| Callidulidae Moore, 1877 | Old World Butterfly Moths | 2 | Species | Taxom |
| Calliphoridae Brauer & Ber..., 1889 | Blow flies | 186 | Species | Taxom |
| Callirhipidae Emden, 1924 | Callirhipid beetles | 12 | Species | Taxom |
| Calophyidae Vondracek, 1957 | | 16 | Species | Taxom |
| Calopterygidae Selys, 1850 | Broad-winged damselflies | 74 | Species | Taxom |
| Canaceidae (Jones, 1906) | Beach flies | 7 | Species | Taxom |
| Cantharidae Imhoff, 1856 | Cantharids | 112 | Species | Taxom |
| Capniidae Klapálek, 1905 | Capniid winter stoneflies | 25 | Species | Taxom |
| Carabidae Latreille, 1802 | Carabid beetles | 4720 | Species | Taxom |
| Carcinophoridae Hincks, 1954 | | 21 | Species | Taxom |
| Caridae Thompson, 1992 | | 2 | Species | Taxom |
| Carnidae Newman, 1834 | Bird flies | 1 | Species | Taxom |
| Carposinidae Walsingham, 1907 | Carposinid moths | 6 | Species | Taxom |
| Carsidaridae Crawford, 1911 | | 7 | Species | Taxom |
| Castniidae Boisduval, 1828 | Castniid moths | 112 | Species | Taxom |
| Cavognathidae Sen Gupta an..., 1966 | | 1 | Species | Taxom |
| Cecidomyiidae Newman, 1834 | Forest Midges | 277 | Species | Taxom |
| Cecidosidae Brèthes, 1916 | Gall Moths | 2 | Species | Taxom |
| Celyphidae Bigot, 1852 | Beetle flies | 1 | Species | Taxom |
| Cerambycidae Latreille, 1802 | Long Horn beetles | 7641 | Species | Taxom |
| Ceraphronidae Haliday, 1833 | Ceraphronid wasps | 0 | Species | Taxom |
| Ceratocombidae Fieber, 1861 | | 1 | Species | Taxom |
| Ceratophyllidae Dampf, 1908 | Bird Fleas | 13 | Species | Taxom |
| Ceratopogonidae Newman, 1834 | Biting midge | 641 | Species | Taxom |
| Cercopidae Leach, 1815 | Froghopper | 456 | Species | Taxom |
| Cercopionidae Hamilton, 1990 | | 1 | Species | Taxom |
| Cerococcidae Balachowsky, 1942 | Cerococcids | 6 | Species | Taxom |
| Cerophytidae Latreille, 1834 | Cerophytid beetles | 10 | Species | Taxom |
| Cerylonidae Billberg, 1820 | Cerylid Kingfishers | 24 | Species | Taxom |
| Cetoniidae (Leach, 1815) | Flower beetles | 1 | Species | Taxom |
| Chaeteessidae Handlirsch, 1920 | | 6 | Species | Taxom |
| Chalcididae Latreille, 1817 | Chalcidid wasps | 228 | Species | Taxom |
| Chamaemyiidae Hendel, 1910 | Aphid flies | 9 | Species | Taxom |
| Chaoboridae Newman, 1834 | Phantom midge | 59 | Species | Taxom |
| Chelonariidae Blanchard, 1845 | Chelonarid beetles | 153 | Species | Taxom |
| Chironomidae Erichson, 1842 | Chironomids | 475 | Species | Taxom |
| Chlorocyphidae Cowley, 1937 | Jewel damselfly | 1 | Species | Taxom |
| Chloroperlidae Okamoto, 1912 | Green stoneflies | 23 | Species | Taxom |
| Chloropidae Schoenherr, 1840 | Chloropid flies | 257 | Species | Taxom |
| Choreutidae Stainton, 1854 | Choreuitid Moths | 23 | Species | Taxom |
| Chorotypidae Stål, 1873 | | 0 | Species | Taxom |
| Chresmodidae Haase, 1890 | | 1 | Species | Taxom |
| Chrysididae Latreille, 1802 | Chrysidid wasps | 117 | Species | Taxom |
| Chrysomelidae Latreille, 1802 | Casebearers | 3608 | Species | Taxom |
| Chrysopidae Schneider, 1851 | And Green Lacewings | 85 | Species | Taxom |
| Chyromyidae Hendel, 1916 | Chiromyid flies | 1 | Species | Taxom |
| Cicadellidae Latreille, 1802 | Cicadellids | 4706 | Species | Taxom |
| Cicadidae Westwood, 1840 | Cicada | 300 | Species | Taxom |
| Ciidae Leach, 1819 | Minute tree fungus beetles | 64 | Species | Taxom |
| Cimbicidae Kirby, 1837 | Cimbicid sawflies | 5 | Species | Taxom |
| Cimicidae Latreille, 1802 | Bat bugs | 7 | Species | Taxom |
| Cixiidae Spinola, 1839 | Cixid planthoppers | 85 | Species | Taxom |
| Clambidae Fischer, 1821 | Fringe-winged beetles | 10 | Species | Taxom |
| Clastopteridae Stål, 1858 | Clastopterid Spittlebugs | 21 | Species | Taxom |
| Cleridae Latreille, 1802 | Checkered Beetle | 50 | Species | Taxom |
| Clothodidae Tillyard, 1937 | | 15 | Species | Taxom |
| Clusiidae Schönherr, 1840 | Clusiid flies | 94 | Species | Taxom |
| Cneoglossidae Champion, 1897 | | 7 | Species | Taxom |
| Coccidae Stephens, 1829 | Soft scale | 226 | Species | Taxom |
| Coccinellidae Latreille, 1807 | Coccinelles | 346 | Species | Taxom |
| Coelopidae Hendel, 1910 | Kelp Flies | 1 | Species | Taxom |
| Coenagrionidae Kirby, 1890 | Narrow-winged damselflies | 369 | Species | Taxom |
| Coleophoridae Hübner, 1825 | Case moths | 75 | Species | Taxom |
| Colletidae Lepeletier, 1841 | Colletid bees | 214 | Species | Taxom |
| Colobathristidae Stål, 1866 | | 32 | Species | Taxom |
| Conchaspididae Green, 1896 | False armored scales | 6 | Species | Taxom |
| Coniopterygidae Burmeister, 1839 | Dusty lacewings | 8 | Species | Taxom |
| Conopidae Latreille, 1802 | Thick-headed Flies | 144 | Species | Taxom |
| Copromorphidae Meyrick, 1905 | Fig Borers | 10 | Species | Taxom |
| Cordulegastridae Calvert, 1893 | Biddie | 1 | Species | Taxom |
| Corduliidae Selys-Longch..., 1850 | Baskettails | 18 | Species | Taxom |
| Coreidae Leach, 1815 | Broad-headed bugs | 616 | Species | Taxom |
| Corioxenidae Kinzelbach, 1970 | | 2 | Species | Taxom |
| Corixidae Leach, 1815 | Lesser Water-Boatman | 41 | Species | Taxom |
| Corydalidae Burmeister, 1839 | Dobsonflies | 40 | Species | Taxom |
| Corydiidae de Saussure, 1864 | Sand cockroaches | 17 | Species | Taxom |
| Corylophidae LeConte, 1852 | Hooded beetles | 6 | Species | Taxom |
| Cosmopterigidae Heinemann & ..., 1876 | Cosmet Moths | 106 | Species | Taxom |
| Cossidae Leach, 1815 | Borers | 243 | Species | Taxom |
| Crabronidae Latreille, 1802 | Bee Wolves | 474 | Species | Taxom |
| Crambidae Latreille, 1810 | Crambid Snout Moths | 1712 | Species | Taxom |
| Cratomastotermitidae Engel, Grima..., 2009 | | 1 | Species | Taxom |
| Cratopetaliidae Bechly, 2010 | | 1 | Species | Taxom |
| Cretapetaluridae Bechly, 1996 | | 3 | Species | Taxom |
| Cryptophagidae Kirby, 1937 | Mould beetles | 2 | Species | Taxom |
| Ctenophthalmidae Rothschild, 1915 | | 14 | Species | Taxom |
| Ctenostylidae Bigot, 1882 | | 1 | Species | Taxom |
| Ctenuchidae (W. Kirby, 1837) | Ctenuchid moths | 24 | Species | Taxom |
| Cucujidae Latreille, 1802 | Flat bark beetles | 89 | Species | Taxom |
| Culicidae Meigen, 1818 | Mosquito | 919 | Species | Taxom |
| Cupedidae Laporte, 1836 | Cupedids | 3 | Species | Taxom |
| Curculionidae Latreille, 1802 | Ambrosia beetles | 9629 | Species | Taxom |
| Curtonotidae Duda, 1934 | Curtonotid flies | 27 | Species | Taxom |
| Cuterebridae (Blake, 1938) | | 1 | Species | Taxom |
| Cydnidae Billberg, 1820 | Burrower bugs | 42 | Species | Taxom |
| Cymidae Baerensprung, 1860 | | 3 | Species | Taxom |
| Cynipidae Latreille, 1802 | Cynipid gall wasps | 8 | Species | Taxom |
| Cypselosomatidae Hennig, 1958 | Cypselosomatid flies | 3 | Species | Taxom |
| Dactylopiidae Signoret, 1875 | Cochineal insects | 5 | Species | Taxom |
| Dalceridae Dyar, 1898 | Dalcerid moths | 13 | Species | Taxom |
| Danaidae (Boisduval, 1833) | Milkweed Butterflies | 3 | Species | Taxom |
| Dasydemellidae | Shaggy Psocids | 9 | Species | Taxom |
| Delphacidae Leach, 1815 | Delphacid planthoppers | 99 | Species | Taxom |
| Derbidae Spinola, 1839 | Derbid planthoppers | 182 | Species | Taxom |
| Dericorythidae Jacobson & B..., 1902 | | 0 | Species | Taxom |
| Dermestidae Hope, 1840 | Carpet beetles | 126 | Species | Taxom |
| Diapheromeridae Rehn & Hebard, 1909 | Diapheromerid Stick Insects | 206 | Species | Taxom |
| Diapriidae Latreille, 1796 | Diapriid wasps | 5 | Species | Taxom |
| Diaspididae Maskell, 1878 | Armored scale insects | 220 | Species | Taxom |
| Diastatidae Hendel, 1917 | Bog flies | 1 | Species | Taxom |
| Dicteriadidae Selys, 1853 | Barelegs | 2 | Species | Taxom |
| Dictyopharidae Spinola, 1839 | Dictyopharid Planthoppers | 56 | Species | Taxom |
| Dilaridae Newman, 1853 | Pleasing lacewing | 2 | Species | Taxom |
| Dinidoridae Stål, 1867 | Dinidorid bug | 4 | Species | Taxom |
| Dioptidae (J. Bechyné, 1950) | American False Tiger Moths | 1 | Species | Taxom |
| Diplatyidae (Verhoeff, 1902) | | 1 | Species | Taxom |
| Discolomatidae Horn, 1878 | | 20 | Species | Taxom |
| Ditomyiidae Keilin, 1919 | | 16 | Species | Taxom |
| Dixidae Schiner, 1868 | Dixid Midges | 10 | Species | Taxom |
| Dolabellopsocidae Eertmoed, 1973 | | 26 | Species | Taxom |
| Dolichopodidae Latreille, 1809 | Long legged flies | 541 | Species | Taxom |
| Douglasiidae Heinemann & ..., 1876 | Douglas Moths | 1 | Species | Taxom |
| Drepanidae Meyrick, 1895 | Drepanids | 8 | Species | Taxom |
| Drosophilidae Rondani, 1856 | Fruit flies | 501 | Species | Taxom |
| Dryinidae Haliday, 1840 | Dryinid wasps | 81 | Species | Taxom |
| Dryophthoridae (Schönherr, 1825) | Palm weevils | 1 | Species | Taxom |
| Dryopidae Billberg, 1820 | Long toed water beetle | 36 | Species | Taxom |
| Dynastidae (MacLeay, 1819) | Horn beetles | 1 | Species | Taxom |
| Dysmorphoptilidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Dytiscidae Leach, 1815 | Diving beetles | 282 | Species | Taxom |
| Echinophthiriidae Enderlein, 1904 | | 1 | Species | Taxom |
| Ecnomidae Ulmer, 1903 | | 34 | Species | Taxom |
| Ectobiidae (Brunner von ..., 1865) | Wood cockroaches | 46 | Species | Taxom |
| Ectopsocidae | Outer Barklice | 17 | Species | Taxom |
| Elachistidae Bruand, 1851 | Elachistid moths | 414 | Species | Taxom |
| Elateridae Leach, 1815 | Click Beetle | 1577 | Species | Taxom |
| Elcanidae Handlirsch, 1906 | | 3 | Species | Taxom |
| Elenchidae Perkins, 1905 | | 2 | Species | Taxom |
| Elipsocidae Pearman, 1936 | Damp Barklice | 8 | Species | Taxom |
| Elmidae Curtis, 1830 | Drive beetles | 237 | Species | Taxom |
| Embiidae Burmeister, 1839 | | 23 | Species | Taxom |
| Embolemidae Förster, 1856 | Embolemid wasps | 1 | Species | Taxom |
| Empididae Latreille, 1809 | Balloon flies | 235 | Species | Taxom |
| Encyrtidae Walker, 1837 | Encyrtid wasps | 149 | Species | Taxom |
| Enderleinellidae Ewing, 1929 | | 5 | Species | Taxom |
| Endomychidae Leach, 1815 | False Ladybirds | 226 | Species | Taxom |
| Eneopteridae (Saussure, 1893) | Bush cricket | 38 | Species | Taxom |
| Enicocephalidae Stål, 1860 | Gnat bug | 2 | Species | Taxom |
| Eolepidopterigidae Rasnitsyn, 1983 | | 2 | Species | Taxom |
| Epermeniidae Spuler, 1910 | Epermeniid moths | 6 | Species | Taxom |
| Ephemerellidae (Klapálek, 1909) | Blue-Winged Olive Ephemerellidae | 1 | Species | Taxom |
| Ephemeridae Leach, 1817 | Burrowing mayflies | 5 | Species | Taxom |
| Ephialtitidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Ephydridae Zetterstedt, 1837 | Brine flies | 188 | Species | Taxom |
| Epipsocidae | Elliptical bark louse | 73 | Species | Taxom |
| Epipygidae Hamilton, 2001 | | 4 | Species | Taxom |
| Epipyropidae Dyar, 1903 | Planthopper Parasite Moths | 3 | Species | Taxom |
| Episactidae Burr, 1899 | | 1 | Species | Taxom |
| Erebidae Leach, 1815 | Erebid Moths | 5516 | Species | Taxom |
| Eremiaphilidae Wood-Mason, 1889 | | 1 | Species | Taxom |
| Eriococcidae Cockerell, 1899 | Eriococcid scales | 26 | Species | Taxom |
| Eriocottidae Spuler, 1898 | Old World Spiny Winged Moths | 3 | Species | Taxom |
| Erotylidae Latreille, 1802 | Pleasing Fungus Beetle | 67 | Species | Taxom |
| Eucharitidae Latreille, 1809 | Eucharitid wasp | 54 | Species | Taxom |
| Eucinetidae Lacordaire, 1857 | Plate-thigh beetle | 5 | Species | Taxom |
| Eucnemidae Eschscholtz, 1829 | Click Beetles | 22 | Species | Taxom |
| Eucoilidae (Thomson, 1862) | | 2 | Species | Taxom |
| Eugereonidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Eulophidae Westwood, 1829 | Eulophid wasps | 232 | Species | Taxom |
| Eumastacidae Burr, 1898 | Matchstick grasshoppers | 172 | Species | Taxom |
| Eumenidae (Leach, 1815) | Eumenid wasps | 1 | Species | Taxom |
| Eupelmidae Walker, 1833 | Eupelmid wasps | 89 | Species | Taxom |
| Euphaeidae Jacobson & B..., 1905 | Gossamerwings | 1 | Species | Taxom |
| Eupterotidae Swinhoe, 1892 | Giant Lappet Moths | 6 | Species | Taxom |
| Eurybrachidae Stål, 1862 | | 1 | Species | Taxom |
| Eurytomidae Walker, 1832 | Eurytomid wasps | 91 | Species | Taxom |
| Euteliidae Grote, 1882 | Euteliid Moths | 55 | Species | Taxom |
| Euthyplociidae Lestage, 1921 | | 6 | Species | Taxom |
| Evaniidae Latreille, 1802 | Ensign wasp | 43 | Species | Taxom |
| Fanniidae Schnabl & Dz..., 1911 | Latrine flies | 65 | Species | Taxom |
| Figitidae Thomson, 1862 | Figitid wasps | 31 | Species | Taxom |
| Flatidae Spinola, 1839 | Flatid planthoppers | 52 | Species | Taxom |
| Forficulidae Stephens, 1829 | Common Earwig | 44 | Species | Taxom |
| Formicidae Latreille, 1809 | Ants | 3335 | Species | Taxom |
| Fulgoridae Latreille, 1807 | Fulgorid Planthopper | 164 | Species | Taxom |
| Gasteruptiidae Ashmead, 1900 | Carrot Wasps | 2 | Species | Taxom |
| Gelastocoridae Kirkaldy, 1897 | Toad bug | 23 | Species | Taxom |
| Gelechiidae Stainton, 1854 | Gelechiid moths | 150 | Species | Taxom |
| Geocoridae Baerensprung, 1860 | Big-eyed Bugs | 32 | Species | Taxom |
| Geometridae Leach, 1815 | Cankerworm moths | 3428 | Species | Taxom |
| Geotrupidae Latreille, 1802 | Dor beetles | 162 | Species | Taxom |
| Gerridae Leach, 1815 | Jesus bugs | 105 | Species | Taxom |
| Glaresidae Kolbe, 1905 | Enigmatic scarab beetle | 2 | Species | Taxom |
| Glossosomatidae Wallengren, 1891 | Little Black Caddisflies | 125 | Species | Taxom |
| Glyphipterigidae Stainton, 1854 | Glyphipterigid moths | 63 | Species | Taxom |
| Goeridae Ulmer, 1903 | | 1 | Species | Taxom |
| Gomphaeschnidae Tillyard & F..., 1940 | | 8 | Species | Taxom |
| Gomphidae Rambur, 1842 | Club-tailed dragonflies | 155 | Species | Taxom |
| Gracillariidae Stainton, 1854 | Blotch leaf miner moths | 135 | Species | Taxom |
| Grammolingiidae Ren, 2002 | | 8 | Species | Taxom |
| Gripopterygidae Enderlein, 1909 | | 61 | Species | Taxom |
| Gryllacrididae Blanchard, 1845 | Camel Crickets | 40 | Species | Taxom |
| Gryllidae Bolivar, 1878 | Crickets | 89 | Species | Taxom |
| Gryllotalpidae Saussure, 1870 | Mole cricket | 56 | Species | Taxom |
| Gyponidae | | 1 | Species | Taxom |
| Gyrinidae Latreille, 1802 | Whirligig beetle | 107 | Species | Taxom |
| Gyropidae Kellogg, 1896 | | 58 | Species | Taxom |
| Haematopinidae Enderlein, 1904 | Ungulate lice | 4 | Species | Taxom |
| Hageniidae Tillyard & F..., 1940 | | 1 | Species | Taxom |
| Halictidae Thomson, 1869 | Flower bees | 448 | Species | Taxom |
| Halictophagidae Perkins, 1905 | | 5 | Species | Taxom |
| Haliplidae Aubé, 1836 | Crawling Water Beetle | 10 | Species | Taxom |
| Hebridae Amyot and Se..., 1843 | Velvet water bug | 15 | Species | Taxom |
| Hedylidae Guenée, 1857 | American Butterfly Moths | 30 | Species | Taxom |
| Heleomyzidae (Westwood, 1840) | Heleomyzid flies | 30 | Species | Taxom |
| Heliconiidae (Swainson, 1822) | Heliconians | 3 | Species | Taxom |
| Helicopsychidae Ulmer, 1912 | Snail Case caddisflies | 68 | Species | Taxom |
| Heliodinidae Heinemann & ..., 1876 | Heliodinid moths | 2 | Species | Taxom |
| Heliozelidae Heinemann & ..., 1876 | Leaf miners | 14 | Species | Taxom |
| Helophoridae (Leach, 1815) | Water scavenger beetles | 1 | Species | Taxom |
| Helosciomyzidae Griffiths, 1972 | | 2 | Species | Taxom |
| Helotrephidae Esaki & China, 1927 | Beetle backswimmers | 5 | Species | Taxom |
| Hemerobiidae Latreille, 1802 | Brown Lacewing | 29 | Species | Taxom |
| Hemiphlebiidae Fraser, 1960 | Ancient greenling | 2 | Species | Taxom |
| Hemipsocidae Pearman, 1936 | Leaf Litter Barklice | 2 | Species | Taxom |
| Hepialidae Stephens, 1829 | Ghost Moths | 57 | Species | Taxom |
| Heptageniidae Needham, 1901 | Flat-Bodied Up-Wings Heptageniidae | 2 | Species | Taxom |
| Heptapsogasteridae (Carriker, 1936) | | 6 | Species | Taxom |
| Hesperiidae Latreille, 1809 | Skipper | 3076 | Species | Taxom |
| Hesperinidae Hendel, 1928 | | 1 | Species | Taxom |
| Heteroceridae MacLeay, 1825 | Mud beetles | 62 | Species | Taxom |
| Heterocheilidae Mcalpine, 1991 | Half-bridge flies | 2 | Species | Taxom |
| Heterogynidae Rambur, 1866 | Mediterranean Burnet Moths | 1 | Species | Taxom |
| Heteromyzidae Fallen, 1820 | Heleomyzid flies | 2 | Species | Taxom |
| Heteronemiidae Rehn, J. A. G., 1904 | | 57 | Species | Taxom |
| Heteropterygidae Kirby, 1896 | | 2 | Species | Taxom |
| Heterothripidae Bagnall, 1912 | | 30 | Species | Taxom |
| Hexagenitidae Lameere, 1917 | | 3 | Species | Taxom |
| Hippoboscidae Samouelle, 1819 | Keds | 167 | Species | Taxom |
| Histeridae Gyllenhal, 1808 | Clown beetle | 1057 | Species | Taxom |
| Hodotermitidae Desneux, 1904 | Harvester termites | 2 | Species | Taxom |
| Homotomidae Heslop-Harrison, 1958 | | 3 | Species | Taxom |
| Hoplopleuridae Ewing, 1929 | | 38 | Species | Taxom |
| Hyblaeidae Hampson, 1903 | Teak Moths | 1 | Species | Taxom |
| Hybophthiridae Ewing, 1929 | | 1 | Species | Taxom |
| Hybosoridae Erichson, 1847 | Pill scarab beetles | 211 | Species | Taxom |
| Hybotidae Meigen, 1820 | Dance flies | 191 | Species | Taxom |
| Hydraenidae Mulsant, 1844 | Cascade Beetles | 127 | Species | Taxom |
| Hydrobiosidae Ulmer, 1905 | | 97 | Species | Taxom |
| Hydrometridae Billberg, 1820 | Marsh treader | 26 | Species | Taxom |
| Hydrophilidae Latreille, 1802 | Silver Water Beetles | 815 | Species | Taxom |
| Hydropsychidae Curtis, 1835 | Net Spinning caddisflies | 332 | Species | Taxom |
| Hydroptilidae Stephens, 1836 | Micro caddisflies | 427 | Species | Taxom |
| Hydroscaphidae LeConte, 1874 | Skiff beetle | 7 | Species | Taxom |
| Hymenopodidae Giglio-Tos, 1919 | Flower mimic mantises | 24 | Species | Taxom |
| Hystrichopsyllidae Tiraboschi, 1904 | Insectivore fleas | 1 | Species | Taxom |
| Ibaliidae Thomson, 1862 | Ibaliid wasps | 2 | Species | Taxom |
| Ichneumonidae Latreille, 1802 | Ichneumon flies | 498 | Species | Taxom |
| Immidae Heppner, 1977 | Imma Moths | 12 | Species | Taxom |
| Inbiomyiidae Buck, 2006 | | 9 | Species | Taxom |
| Ischnopsyllidae Wahlgren, 1907 | Bat fleas | 12 | Species | Taxom |
| Isostictidae Fraser, 1955 | Narrow-wings | 1 | Species | Taxom |
| Issidae Spinola, 1839 | Issid planthoppers | 62 | Species | Taxom |
| Ithonidae Newman, 1838 | Ithonid lacewings | 1 | Species | Taxom |
| Jascopidae Hamilton, 1971 | | 1 | Species | Taxom |
| Kalligrammatidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Kalotermitidae Froggatt, 1897 | Dampwood termites | 61 | Species | Taxom |
| Kateretidae Kirkby, 1837 | Pollen Beetles | 1 | Species | Taxom |
| Kermesidae Signoret, 1875 | Gall-like Scale Insects | 1 | Species | Taxom |
| Keroplatidae Rondani, 1856 | Fungus gnats | 123 | Species | Taxom |
| Kerriidae Lindinger, 1937 | Lac Insects | 5 | Species | Taxom |
| Kinnaridae Muir, 1925 | Kinnarid Planthoppers | 6 | Species | Taxom |
| Kuwaniidae MacGillvray, 1921 | | 1 | Species | Taxom |
| Labiduridae Verhoeff, 1902 | Long-horned earwig | 6 | Species | Taxom |
| Labiidae (Burr, 1909) | Little earwig | 58 | Species | Taxom |
| Lachesillidae Pearman, 1936 | Fateful Barklice | 102 | Species | Taxom |
| Lacturidae Heppner, 1995 | Australian burnet moths | 2 | Species | Taxom |
| Laemobothriidae Mjöberg, 1910 | | 4 | Species | Taxom |
| Lalacidae Hamilton, 1990 | | 18 | Species | Taxom |
| Lampyridae Latreille, 1817 | Fireflies | 180 | Species | Taxom |
| Largidae Amyot and Se..., 1843 | Bordered plant bugs | 22 | Species | Taxom |
| Lasiocampidae Harris, 1841 | Eggar Moths | 273 | Species | Taxom |
| Latridiidae Erichson, 1842 | Minute brown scavenger beetle | 36 | Species | Taxom |
| Lauxaniidae Macquart, 1835 | Beach flies | 172 | Species | Taxom |
| Lecanodiaspididae Borchsenius, 1965 | False pit scales | 5 | Species | Taxom |
| Lecithoceridae Le Marchand, 1947 | Long-horned moths | 6 | Species | Taxom |
| Leiodidae Fleming, 1821 | Round fungus beetles | 226 | Species | Taxom |
| Lemoniidae Hampson, 1918 | Autumn Silkworm Moths | 1 | Species | Taxom |
| Lepiceridae Hinton, 1936 | | 2 | Species | Taxom |
| Lepidopsocidae Lienhard & S..., 2002 | Scaly-winged bark louse | 18 | Species | Taxom |
| Lepidostomatidae Ulmer, 1903 | Bizarre Caddisflies | 1 | Species | Taxom |
| Lepismatidae Latreille, 1802 | Lepismatid Fishmoths | 11 | Species | Taxom |
| Leptoceridae Leach, 1815 | Long Horned caddisflies | 160 | Species | Taxom |
| Leptohyphidae Landa & Soldán, 1985 | Little Stout Crawler Mayflies | 78 | Species | Taxom |
| Leptophlebiidae Banks, 1900 | Leptophlebiids | 142 | Species | Taxom |
| Leptopsyllidae Rothschild &..., 1915 | Bird fleas | 2 | Species | Taxom |
| Lestidae Calvert, 1901 | Spread-winged damselflies | 29 | Species | Taxom |
| Leucospidae Fabricius, 1775 | Leucospid wasps | 34 | Species | Taxom |
| Leuctridae Klapálek, 1905 | Needle Or Willow Stoneflies | 10 | Species | Taxom |
| Libellulidae Rambur, 1842 | Chasers | 344 | Species | Taxom |
| Limacodidae Duponchel, 1845 | Cup moths | 107 | Species | Taxom |
| Limnephilidae Kolenati, 1848 | Northern caddisflies | 17 | Species | Taxom |
| Limnichidae Erichson, 1846 | Minute marsh loving beetle | 72 | Species | Taxom |
| Limoniidae (Speiser, 1909) | Craneflies | 107 | Species | Taxom |
| Linognathidae Webb, 1946 | | 7 | Species | Taxom |
| Liopteridae Ashmead, 1895 | Liopterid wasps | 8 | Species | Taxom |
| Liposcelididae Enderlein, 1911 | Booklice | 36 | Species | Taxom |
| Liturgusidae Giglio-Tos, 1919 | | 32 | Species | Taxom |
| Liupanshaniidae Bechly & al, 2001 | | 2 | Species | Taxom |
| Liviidae Low, 1879 | | 11 | Species | Taxom |
| Locustopsidae Handlirsch, 1906 | | 22 | Species | Taxom |
| Lonchaeidae Loew, 1861 | Lance Flies | 71 | Species | Taxom |
| Lophopidae Stål, 1866 | | 5 | Species | Taxom |
| Lucanidae Latreille, 1804 | Stag Beetle | 259 | Species | Taxom |
| Lutrochidae Kasap & Crowson, 1975 | Robust marsh loving beetle | 10 | Species | Taxom |
| Lycaenidae Leach, 1815 | Blue butterflies | 2246 | Species | Taxom |
| Lycidae Laporte, 1836 | Lycid beetles | 32 | Species | Taxom |
| Lygaeidae Schilling, 1829 | Chinch bugs | 222 | Species | Taxom |
| Lygistorrhinidae Hendel, 1936 | Long beaked fungus gnat | 1 | Species | Taxom |
| Lymexylidae Fleming, 1821 | Ship-timber beetle | 15 | Species | Taxom |
| Lyonetiidae Stainton, 1854 | Lyonet Moths | 19 | Species | Taxom |
| Magnathemidae Bechly, 2010 | | 1 | Species | Taxom |
| Mantidae Burmeister, 1838 | Mantids | 171 | Species | Taxom |
| Mantispidae Leach, 1815 | Mantid lacewings | 40 | Species | Taxom |
| Mantoididae Giglio-Tos, 1927 | | 8 | Species | Taxom |
| Margarodidae Newstead, 1901 | Cottony cushion scales | 7 | Species | Taxom |
| Mastotermitidae Desneux, 1904 | | 1 | Species | Taxom |
| Mauroniscidae Majer, 1995 | Mauroniscid Beetles | 9 | Species | Taxom |
| Megachilidae Schenk, 1860 | And Resin Bees | 390 | Species | Taxom |
| Megalodontesidae Konow, 1897 | | 1 | Species | Taxom |
| Megalopodidae Latreille, 1802 | Megalopodid Leaf Beetles | 146 | Species | Taxom |
| Megalopygidae Herrich-Schä..., 1855 | Crinkled Flannel Moths | 59 | Species | Taxom |
| Megalyridae Schletterer, 1889 | Megalyrid wasps | 2 | Species | Taxom |
| Megaphlebiidae Bechly, 2010 | | 1 | Species | Taxom |
| Megapodagrionidae Tillyard, 1917 | Flatwing | 106 | Species | Taxom |
| Megarididae McAtee & Mal..., 1928 | | 2 | Species | Taxom |
| Megaspilidae Ashmead, 1893 | Megaspilid wasps | 1 | Species | Taxom |
| Meinertellidae Verhoeff, 1910 | Hump-backed Bristletails | 12 | Species | Taxom |
| Melandryidae Leach, 1815 | False Darkling Beetle | 34 | Species | Taxom |
| Melittidae Schenk, 1860 | Melittid bees | 1 | Species | Taxom |
| Meloidae Gyllenhal, 1810 | Blister Beetle | 251 | Species | Taxom |
| Melolonthidae (Leach, 1817) | Chafers | 1 | Species | Taxom |
| Melyridae Leach, 1815 | Malachite Beetles | 9 | Species | Taxom |
| Membracidae Germar, 1821 | Horned Treehoppers | 1235 | Species | Taxom |
| Menoponidae Mjöberg, 1910 | Bird lice | 181 | Species | Taxom |
| Meropeidae Espen-Petersen, 1921 | Earwig-flies | 2 | Species | Taxom |
| Merothripidae Hood, 1914 | Large-legged thrips | 8 | Species | Taxom |
| Meruidae Spangler & S..., 2005 | Meru phyllisae | 1 | Species | Taxom |
| Mesoblattinidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Mesochrysopidae Handlirsch, 1906 | | 8 | Species | Taxom |
| Mesoveliidae Douglas and ..., 1867 | Pond treaders | 9 | Species | Taxom |
| Mesuropetalidae Bechly, 1996 | | 1 | Species | Taxom |
| Mickoleitiidae Staniczek, B..., 2011 | | 1 | Species | Taxom |
| Micromalthidae Barber, 1913 | Micromalthid beetles | 1 | Species | Taxom |
| Micronectidae Jaczewski, 1924 | Pygmy water boatmen | 12 | Species | Taxom |
| Micropezidae Illiger, 1798 | Stilt Flies | 218 | Species | Taxom |
| Micropterigidae Herrich-Schä..., 1855 | Mandibulate Archaic Moths | 1 | Species | Taxom |
| Milichiidae Schiner, 1862 | Filth flies | 54 | Species | Taxom |
| Mimallonidae Burmeister, 1878 | Mimallonid Moths | 138 | Species | Taxom |
| Miridae Hahn, 1831 | Capsid bugs | 1678 | Species | Taxom |
| Mogoplistidae Saussure, 1877 | Scaly cricket | 12 | Species | Taxom |
| Monomachidae Ashmead, 1902 | Monomachid wasps | 15 | Species | Taxom |
| Monophlebidae Signoret, 1875 | Giant scale | 28 | Species | Taxom |
| Monotomidae Laporte, 1840 | Minute Clubbed Beetles | 18 | Species | Taxom |
| Mordellidae Latreille, 1802 | Pintail beetles | 192 | Species | Taxom |
| Musapsocidae Mockford, 1967 | | 4 | Species | Taxom |
| Muscidae Latreille, 1802 | Face flies | 608 | Species | Taxom |
| Mutillidae André, 1907 | Cow ant | 162 | Species | Taxom |
| Mycetophagidae Leach, 1815 | Hairy fungus beetle | 5 | Species | Taxom |
| Mycetophilidae Newman, 1834 | Fungus Gnat | 606 | Species | Taxom |
| Mycteridae Blanchard, 1845 | Mycterid beetles | 55 | Species | Taxom |
| Mydidae Bezzi, 1903 | Mydas flies | 48 | Species | Taxom |
| Myerslopiidae Evans, 1957 | | 7 | Species | Taxom |
| Mymaridae Haliday, 1833 | Fairflies | 52 | Species | Taxom |
| Myopsocidae Enderlein, 1907 | Mouse like barklouse | 17 | Species | Taxom |
| Myrmecolacidae Saunders, 1872 | | 6 | Species | Taxom |
| Myrmecophilidae Saussure, 1874 | Ant cricket | 2 | Species | Taxom |
| Myrmeleontidae Latreille, 1802 | Ant lions | 65 | Species | Taxom |
| Nabidae Costa, 1852 | Damsel bugs | 10 | Species | Taxom |
| Naucoridae Leach, 1815 | Creeping water bug | 77 | Species | Taxom |
| Nemestrinidae Macquart, 1834 | Tangle-veined flies | 23 | Species | Taxom |
| Nemonychidae Bedel, 1882 | Nemonychid weevils | 7 | Species | Taxom |
| Nemopteridae Rambur, 1842 | Spoonwings | 5 | Species | Taxom |
| Nemouridae Newman, 1853 | Brown stoneflies | 19 | Species | Taxom |
| Neopetaliidae Tillyard & F..., 1940 | | 1 | Species | Taxom |
| Neotheoridae Kirstensen, 1978 | Amazonian Primitive Ghost Moths | 0 | Species | Taxom |
| Nepidae Latreille, 1802 | Back-swimmer Water-boatmen | 35 | Species | Taxom |
| Nepticulidae Stainton, 1854 | Leaf miners | 77 | Species | Taxom |
| Neriidae Hendel, 1916 | Banana stalk flies | 33 | Species | Taxom |
| Neurostigmatidae | | 9 | Species | Taxom |
| Nicoletiidae Escherich, 1905 | Nicoletiid Fishmoths | 15 | Species | Taxom |
| Nitidulidae Latreille, 1802 | Nitidules | 40 | Species | Taxom |
| Nocticolidae Bolivar, 1892 | Australian cockroaches | 23 | Species | Taxom |
| Noctuidae Latreille, 1809 | Armyworms | 1221 | Species | Taxom |
| Nogodinidae Melichar, 1898 | | 43 | Species | Taxom |
| Nolidae Hampson, 1894 | Hatted Caterpillars | 112 | Species | Taxom |
| Nosodendridae Erichson, 1846 | Nosodendrid beetles | 14 | Species | Taxom |
| Noteridae C. G. Thomson, 1860 | Burrowing water beetle | 51 | Species | Taxom |
| Nothomacromiidae (Carle, 1995) | | 1 | Species | Taxom |
| Notodontidae Stephens, 1829 | Bag Shelter Moths | 1440 | Species | Taxom |
| Notonectidae Latreille, 1802 | Back Swimmers | 60 | Species | Taxom |
| Nycteribiidae Samouelle, 1819 | Bat Flies | 1 | Species | Taxom |
| Nymphalidae Rafinesque, 1815 | Admirals | 4572 | Species | Taxom |
| Nymphidae Rambur, 1842 | Split-footed lacewing | 4 | Species | Taxom |
| Ochodaeidae Mulsant & Rey, 1870 | Sand-loving scarab beetle | 10 | Species | Taxom |
| Ochteridae Kirkaldy, 1906 | Velvety shore bug | 2 | Species | Taxom |
| Odiniidae Hendel, 1920 | Odiniid flies | 24 | Species | Taxom |
| Odontoceridae Wallengren, 1891 | Mortarjoint Casemaker Caddisflies | 26 | Species | Taxom |
| Oecanthidae (Blanchard, 1845) | Tree cricket | 19 | Species | Taxom |
| Oecophoridae Bruand, 1851 | Concealer Moths | 59 | Species | Taxom |
| Oedemeridae Latreille, 1810 | False Blister Beetle | 11 | Species | Taxom |
| Oestridae Leach, 1815 | Bot flies | 46 | Species | Taxom |
| Oligoneuriidae Ulmer, 1914 | Brushleg Mayflies | 22 | Species | Taxom |
| Oligotomidae Enderlein, 1909 | | 2 | Species | Taxom |
| Ommatidae Sharp & Muir, 1912 | | 2 | Species | Taxom |
| Ommexechidae Bolivar, 1884 | | 23 | Species | Taxom |
| Opomyzidae (Fallen, 1820) | Opomyzid flies | 1 | Species | Taxom |
| Opostegidae Meyrick, 1893 | Opostegid moths | 7 | Species | Taxom |
| Ormyridae Förster, 1856 | Armyrids | 1 | Species | Taxom |
| Orphnidae Orphnus mash..., 1908 | | 1 | Species | Taxom |
| Orsodacnidae Thomson, 1859 | Orsodacnid Leaf Beetles | 4 | Species | Taxom |
| Ortheziidae Green, 1896 | Ensign coccids | 48 | Species | Taxom |
| Orussidae Newman, 1834 | Orussid wasps | 8 | Species | Taxom |
| Osmylidae Leach, 1815 | Giant lacewings | 17 | Species | Taxom |
| Otitidae (Macquart, 1835) | Picture-winged flies | 186 | Species | Taxom |
| Oviparosiphidae Shaposhnikov, 1979 | | 3 | Species | Taxom |
| Oxycarenidae Stål, 1862 | | 5 | Species | Taxom |
| Pachygronthidae Stål, 1865 | | 16 | Species | Taxom |
| Pachynomidae Stål, 1873 | | 1 | Species | Taxom |
| Pachytroctidae Enderlein, 1911 | Thick Barklice | 9 | Species | Taxom |
| Palaeoleontidae Martins-Neto, 1992 | Ant lion | 16 | Species | Taxom |
| Palaeontinidae Handlirsch, 1906 | Giant cicadas | 9 | Species | Taxom |
| Pamphagidae Burmeister, 1840 | Toad grasshopper | 0 | Species | Taxom |
| Pamphiliidae Cameron, 1890 | Leaf-rolling sawflies | 1 | Species | Taxom |
| Panfiloviidae Makarkin, 1990 | | 1 | Species | Taxom |
| Pantophthalmidae Williston, 1906 | Timber flies | 20 | Species | Taxom |
| Papilionidae Latreille, 1802 | Apollos | 497 | Species | Taxom |
| Paragryllidae (Desutter-Gra..., 1987) | | 42 | Species | Taxom |
| Passalidae Leach, 1815 | Bess beetle | 376 | Species | Taxom |
| Pediciidae Osten Sacken, 1860 | Hairy-Eyed Crane Flies | 0 | Species | Taxom |
| Pedicinidae Enderlein, 1904 | | 2 | Species | Taxom |
| Pediculidae Leach, 1817 | | 2 | Species | Taxom |
| Pelecinidae Haliday, 1839 | Ancestral And Modern Pelecinid Wasps | 2 | Species | Taxom |
| Pelecorhynchidae Philip, 1941 | Pelecorhynchid flies | 2 | Species | Taxom |
| Peltoperlidae Claassen, 1931 | Roach stoneflies | 1 | Species | Taxom |
| Pentatomidae Leach, 1815 | Lesser shield bugs | 375 | Species | Taxom |
| Pereboriidae Zalessky, 1930 | | 1 | Species | Taxom |
| Perforissidae Shcherbakov, 2007 | | 1 | Species | Taxom |
| Pergidae Rohwer, 1911 | Pergid flies | 64 | Species | Taxom |
| Perilampidae Latreille, 1809 | Perilampid waps | 13 | Species | Taxom |
| Perilestidae Tillyard & F..., 1938 | Shortwings | 12 | Species | Taxom |
| Peripsocidae Roesler, 1944 | Stout Barklice | 17 | Species | Taxom |
| Periscelididae Oldenberg, 1914 | Periscelidid Flies | 29 | Species | Taxom |
| Perlidae (Latreille, 1802) | Common stoneflies | 387 | Species | Taxom |
| Perlodidae Klapálek, 1912 | Perlodid stoneflies | 28 | Species | Taxom |
| Permaeschnidae Martynov, 1931 | | 1 | Species | Taxom |
| Permithonidae Tillyard, 1922 | | 1 | Species | Taxom |
| Permochoristidae Tillyard, 1918 | | 3 | Species | Taxom |
| Permocupedidae Martynov, 1933 | | 3 | Species | Taxom |
| Personidae Gray, 1854 | | 10 | Species | Taxom |
| Petaluridae Needham, 1903 | Grayback dragonfly | 1 | Species | Taxom |
| Phalacridae Leach, 1815 | Shining flower beetles | 1 | Species | Taxom |
| Phalangopsidae (Chopard, 1949) | Spider cricket | 191 | Species | Taxom |
| Phasmatidae Roberts, 1944 | Walking sticks | 56 | Species | Taxom |
| Phasmomimidae Sharov, 1968 | | 1 | Species | Taxom |
| Phengodidae LeConte, 1861 | Glow-worms | 148 | Species | Taxom |
| Philopotamidae Stephens, 1829 | Finger Net caddisflies | 228 | Species | Taxom |
| Philopteridae Burmeister, 1830 | | 513 | Species | Taxom |
| Philotarsidae Pearman, 1936 | Loving Barklice | 10 | Species | Taxom |
| Phlaeothripidae Uzel, 1895 | Thrips | 508 | Species | Taxom |
| Phloeidae Amyot & Serv..., 1843 | | 0 | Species | Taxom |
| Phoenicococcidae Stickney, 1934 | Palm scales | 1 | Species | Taxom |
| Phoridae Curtis, 1833 | Coffin Flies | 1134 | Species | Taxom |
| Phryganeidae (Leach, 1815) | Giant casemaker | 1 | Species | Taxom |
| Pieridae Duponchel, 1835 | Brimstones | 663 | Species | Taxom |
| Piophilidae Macquart, 1835 | Cheese flies | 7 | Species | Taxom |
| Pipunculidae Walker, 1834 | Big headed flies | 173 | Species | Taxom |
| Plataspidae (Dallas, 1851) | | 1 | Species | Taxom |
| Platycnemididae Tillyard, 1917 | White-legged damselflies | 3 | Species | Taxom |
| Platygastridae Haliday, 1833 | Platygastrid wasps | 15 | Species | Taxom |
| Platypezidae Fallen, 1815 | Flat footed flies | 7 | Species | Taxom |
| Platystictidae Laidlaw, 1924 | Forest Damselflies | 21 | Species | Taxom |
| Platystomatidae Schiner, 1862 | Picture-winged flies | 14 | Species | Taxom |
| Pleidae Fieber, 1817 | Pigmy backswimmers | 7 | Species | Taxom |
| Plokiophilidae China, 1953 | Spider web bug | 1 | Species | Taxom |
| Plumariidae Bischoff, 1914 | Plumariid wasps | 1 | Species | Taxom |
| Plutellidae Guenée, 1845 | Diamond-back moths | 7 | Species | Taxom |
| Podoscirtidae Saussure, 1878 | | 150 | Species | Taxom |
| Polycentropodidae Ulmer, 1903 | Tube Maker Caddisflies | 157 | Species | Taxom |
| Polyctenidae Westwood, 1874 | Bat bugs | 1 | Species | Taxom |
| Polymitarcyidae Banks, 1900 | Pale Burrower Mayflies | 65 | Species | Taxom |
| Polyplacidae Fahrenholz, 1912 | Spiny rat lice | 10 | Species | Taxom |
| Polythoridae Munz, 1919 | Bannerwings | 50 | Species | Taxom |
| Pompilidae Latreille, 1805 | Pompilid wasps | 451 | Species | Taxom |
| Potamocoridae Štys & Jansson, 1988 | | 1 | Species | Taxom |
| Pothamantidae MeCafferty, 1990 | | 1 | Species | Taxom |
| Prezottophlebiidae Martins-Neto, 2007 | | 1 | Species | Taxom |
| Prisopodidae Brunner von ..., 1893 | | 68 | Species | Taxom |
| Proctotrupidae Latreille, 1802 | Proctotrupid wasps | 1 | Species | Taxom |
| Prodoxidae Riley, 1881 | Yucca Moths | 4 | Species | Taxom |
| Proedischiidae Pinto & Orne..., 1978 | | 3 | Species | Taxom |
| Prophalangopsidae Saussure, 1878 | Grigs | 4 | Species | Taxom |
| Prosbolidae Handlirsch, 1906 | | 3 | Species | Taxom |
| Proscopiidae Serville, 1838 | Jumping sticks | 139 | Species | Taxom |
| Prostomidae C. G. Thomson, 1859 | Jugular-horned beetle | 1 | Species | Taxom |
| Proterogomphidae Bechly, 1996 | | 10 | Species | Taxom |
| Protoneuridae Tillyard, 1917 | Bambootails | 39 | Species | Taxom |
| Protophasmatidae Brongniart, 1885 | | 2 | Species | Taxom |
| Psephenidae Lacordaire, 1854 | Water pennies | 12 | Species | Taxom |
| Pseudocaeciliidae Pearman, 1936 | False Lizard Barklice | 7 | Species | Taxom |
| Pseudococcidae Heymons, 1915 | Mealy Bugs | 135 | Species | Taxom |
| Pseudonerthridae Martins-Neto..., 2005 | | 1 | Species | Taxom |
| Pseudophasmatidae Kirby, 1896 | Striped Walkingsticks | 330 | Species | Taxom |
| Pseudophyllodromiidae Hebard, 1929 | | 367 | Species | Taxom |
| Pseudopomyzidae (Mcalpine, 1966) | Banana flies | 4 | Species | Taxom |
| Pseudostigmatidae Tillyard, 1917 | Forest giants | 17 | Species | Taxom |
| Psilidae Macquart, 1835 | Carrot flies | 3 | Species | Taxom |
| Psocidae Samouelle, 1819 | Common bark louse | 173 | Species | Taxom |
| Psoquillidae Lienhard & S..., 2002 | Bird Nest Barklice | 3 | Species | Taxom |
| Psychidae Boisduval, 1828 | Bagmoths | 33 | Species | Taxom |
| Psychodidae Newman, 1834 | Drain flies | 659 | Species | Taxom |
| Psychopsidae Handlirsch, 1906 | Silky lacewing | 2 | Species | Taxom |
| Psyllidae Latreille, 1807 | Jumping plant lice | 116 | Species | Taxom |
| Psyllipsocidae Enderlein, 1903 | Cave Barklice | 4 | Species | Taxom |
| Pteromalidae Dalman, 1820 | Pteromalid wasps | 182 | Species | Taxom |
| Pteronarcyidae Enderlein, 1909 | Giant stoneflies | 4 | Species | Taxom |
| Pterophoridae Zeller, 1841 | Plume Moths | 373 | Species | Taxom |
| Pthiridae Leach, 1817 | | 1 | Species | Taxom |
| Ptiliidae Heer, 1843 | Feather-wing beetles | 129 | Species | Taxom |
| Ptilodactylidae Laporte, 1836 | Ptilodactylid beetles | 104 | Species | Taxom |
| Ptiloneuridae Eertmoed, 1973 | | 180 | Species | Taxom |
| Ptinidae Latreille, 1802 | Death-watch and Spider Beetles | 86 | Species | Taxom |
| Ptychopteridae Osten Sacken, 1862 | Phantom crane flies | 1 | Species | Taxom |
| Pulicidae Billberg, 1820 | Cat fleas | 22 | Species | Taxom |
| Putoidae Beardsley, 1969 | Giant mealybugs | 6 | Species | Taxom |
| Pygidicranidae (Verhoeff, 1902) | | 19 | Species | Taxom |
| Pygiopsyllidae Wagner, 1939 | | 6 | Species | Taxom |
| Pyralidae Latreille, 1802 | Flour Moths | 519 | Species | Taxom |
| Pyrgomorphidae Brunner von ..., 1874 | Bushlocusts | 8 | Species | Taxom |
| Pyrgotidae Schiner, 1868 | Light Flies | 39 | Species | Taxom |
| Pyrochroidae Latreille, 1807 | Cardinal beetles | 1 | Species | Taxom |
| Pyrrhocoridae Dohrn, 1859 | Cotton stainers | 18 | Species | Taxom |
| Pythidae Solier, 1834 | Dead log bark beetles | 1 | Species | Taxom |
| Rafaelianidae Engel & Nel, 2017 | | 2 | Species | Taxom |
| Rangomaramidae Jaschhof & D..., 2002 | | 4 | Species | Taxom |
| Raphidiidae Latreille, 1810 | Raphidiid snakeflies | 4 | Species | Taxom |
| Raphoglidae Béthoux & al., 2002 | | 1 | Species | Taxom |
| Reduviidae Latreille, 1807 | Assassin and thread-legged bugs | 647 | Species | Taxom |
| Rhagionemestriidae Ussatchov, 1968 | | 1 | Species | Taxom |
| Rhagionidae Latreille, 1802 | Snipe flies | 43 | Species | Taxom |
| Rhaphidophoridae Walker, 1869 | And Cave Weta | 5 | Species | Taxom |
| Rhinophoridae Robineau-Des..., 1863 | Woodlouse flies | 8 | Species | Taxom |
| Rhinotermitidae Froggatt, 1897 | Subterranean termites | 23 | Species | Taxom |
| Rhipiceridae Latreille, 1834 | Cedar beetles | 1 | Species | Taxom |
| Rhipiphoridae Gemminger & ..., 1870 | Hump back beetles | 1 | Species | Taxom |
| Rhizoecidae Williams, 1969 | | 24 | Species | Taxom |
| Rhopalidae Amyot & Serv..., 1843 | Rhopalid Bugs | 42 | Species | Taxom |
| Rhopalopsyllidae Oudemans, 1909 | Marsupial fleas | 60 | Species | Taxom |
| Rhopalosomatidae Ashmead, 1896 | Rhopalosomatid wasps | 8 | Species | Taxom |
| Rhyacophilidae Stephens, 1836 | Free-living Caddisflies | 1 | Species | Taxom |
| Rhynchitidae Gistel, 1848 | Leaf-rolling weevils | 12 | Species | Taxom |
| Rhyparochromidae Amyot & Serv..., 1843 | Dirt-colored Seed Bugs | 143 | Species | Taxom |
| Ricaniidae Amyot & Audi..., 1843 | | 8 | Species | Taxom |
| Richardidae Snow, 1896 | Richardid flies | 104 | Species | Taxom |
| Richardiidae (Snow, 1896) | Picture-winged flies | 39 | Species | Taxom |
| Ricinidae Neumann, 1890 | | 58 | Species | Taxom |
| Riodinidae Grote, 1895 | Metalmark Butterflies | 1776 | Species | Taxom |
| Ripiphoridae Gemminger & ..., 1870 | Rhipiphoridae | 3 | Species | Taxom |
| Ripipterygidae Ander, 1939 | Mud crickets | 52 | Species | Taxom |
| Roeslerianidae Martins-Neto, 1997 | | 1 | Species | Taxom |
| Romaleidae Brunner von ..., 1893 | Lubber grasshopper | 415 | Species | Taxom |
| Ropalomeridae Linder, 1930 | Ropalomerid flies | 30 | Species | Taxom |
| Rutelidae (MacLeay, 1819) | | 161 | Species | Taxom |
| Saldidae Amyot and Se..., 1843 | Shore bug | 13 | Species | Taxom |
| Salpingidae Leach, 1815 | Narrow-waisted bark beetle | 11 | Species | Taxom |
| Santanmantidae Grimaldi, 2003 | | 1 | Species | Taxom |
| Sapygidae Latreille, 1810 | Club-horned wasps | 1 | Species | Taxom |
| Sarcophagidae Macquart, 1834 | Flesh flies | 620 | Species | Taxom |
| Saturniidae Boisduval, 1837 | And Giant Silk Moths | 816 | Species | Taxom |
| Scarabaeidae Latreille, 1802 | Dung beetles | 5996 | Species | Taxom |
| Scathophagidae Robineau-Des..., 1830 | Dung flies | 5 | Species | Taxom |
| Scatopsidae Newman, 1834 | Dung midges | 5 | Species | Taxom |
| Scelembiidae Ross, 2001 | | 13 | Species | Taxom |
| Scelionidae Haliday, 1839 | Scelionid wasps | 141 | Species | Taxom |
| Scenopinidae Burmeister, 1835 | Window Flies | 11 | Species | Taxom |
| Schizopteridae Reuter, 1891 | Jumping ground bugs | 16 | Species | Taxom |
| Schreckensteiniidae Fletcher, 1929 | Bristle Legged Moths | 0 | Species | Taxom |
| Sciaridae Billberg, 1820 | Black fungus gnats | 57 | Species | Taxom |
| Sciomyzidae Fallen, 1820 | Marsh Flies | 48 | Species | Taxom |
| Scirtidae Fleming, 1821 | Marsh Beetle | 20 | Species | Taxom |
| Sclerogibbidae Ashmead, 1902 | Sclerogibbid wasp | 2 | Species | Taxom |
| Scoliidae Leach, 1815 | Mammoth wasps | 21 | Species | Taxom |
| Scolytidae (Latreille, 1807) | Ambrosia | 6 | Species | Taxom |
| Scraptiidae Mulsant, 1856 | Antlike leaf beetles | 7 | Species | Taxom |
| Scutelleridae Leach, 1815 | Jewel bugs | 29 | Species | Taxom |
| Scydmaenidae (Leach, 1815) | Ant-like stone beetles | 603 | Species | Taxom |
| Scythrididae Rebel, 1901 | Flower Moths | 3 | Species | Taxom |
| Sematuridae Guenée, 1858 | American Swallowtail Moths | 9 | Species | Taxom |
| Sepsidae Walker, 1833 | Black scavenger flies | 37 | Species | Taxom |
| Sepulcidae Rasnitsyn, 1968 | | 1 | Species | Taxom |
| Serendipidae Evenhuis, 1994 | | 0 | Species | Taxom |
| Serritermitidae Emerson & Kr..., 1975 | | 3 | Species | Taxom |
| Sesiidae Boisduval, 1828 | Clear Wings | 77 | Species | Taxom |
| Sialidae Leach, 1815 | Alderflies | 5 | Species | Taxom |
| Sierolomorphidae Krombein, 1951 | Sierolomorphid wasp | 0 | Species | Taxom |
| Signiphoridae Howard, 1894 | Signiphorid waps | 24 | Species | Taxom |
| Silphidae Latreille, 1807 | Burying And Carrion Beetles | 18 | Species | Taxom |
| Silvanidae Kirby, 1837 | Flat bark beetles | 79 | Species | Taxom |
| Simuliidae Newman, 1834 | Black flies | 253 | Species | Taxom |
| Siphlaenigmatidae Penniket, 1962 | | 3 | Species | Taxom |
| Siphlonuridae Banks, 1900 | Primitive Minnow Mayflies | 1 | Species | Taxom |
| Siricidae Billberg, 1820 | Horntail | 4 | Species | Taxom |
| Sisyridae Handlirsch, 1908 | Spongeflies | 7 | Species | Taxom |
| Smicripidae Horn, 1879 | Palmetto beetle | 0 | Species | Taxom |
| Somatiidae Hendel, 1935 | | 7 | Species | Taxom |
| Spanioderidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Sphaeriusidae Erichson, 1845 | Minute Bog Beetles | 0 | Species | Taxom |
| Sphaeroceridae Macquart, 1835 | Dung flies | 177 | Species | Taxom |
| Sphecidae Latreille, 1802 | Digger & Sand wasps | 119 | Species | Taxom |
| Sphindidae Jacquelin du..., 1860 | Cryptic slime mold beetle | 4 | Species | Taxom |
| Sphingidae Latreille, 1802 | Hawk Moths | 474 | Species | Taxom |
| Spiralizoridae Kocarek, Ho..., 2020 | | 5 | Species | Taxom |
| Spongiphoridae Verhoeff, 1902 | Little Earwigs | 48 | Species | Taxom |
| Spurostigmatidae Casasola Gon..., 2006 | | 23 | Species | Taxom |
| Staphylinidae Lameere, 1900 | Rove beetles | 5856 | Species | Taxom |
| Stenopelmatidae Burmeister, 1838 | Bulldog Raspy Crickets | 3 | Species | Taxom |
| Stenophlebiidae Needham, 1903 | | 1 | Species | Taxom |
| Stenopsocidae Pearman, 1936 | Narrow Barklice | 2 | Species | Taxom |
| Stephanidae Leach, 1815 | Crown wasp | 22 | Species | Taxom |
| Stephanocircidae Wagner, 1928 | | 24 | Species | Taxom |
| Stigmacoccidae Morrison giv..., 2006 | | 2 | Species | Taxom |
| Stratiomyidae Latreille, 1802 | Soldier flies | 584 | Species | Taxom |
| Streblidae (Kolenati, 1863) | Bat flies | 44 | Species | Taxom |
| Stylopidae Kirby, 1813 | Strepsiptera | 7 | Species | Taxom |
| Synlestidae Tillyard, 1917 | Malachite | 0 | Species | Taxom |
| Syntomidae (Herrich Scha..., 1846) | | 16 | Species | Taxom |
| Syringogastridae Prado, 1969 | | 8 | Species | Taxom |
| Syrphidae Latreille, 1802 | Drone flies | 1190 | Species | Taxom |
| Tabanidae Latreille, 1802 | Breeze flies | 929 | Species | Taxom |
| Tachardiidae Green, 1896 | Lac insects | 13 | Species | Taxom |
| Tachinidae (Robineau-Des..., 1830) | Bristle Flies | 1764 | Species | Taxom |
| Taeniopterygidae Klapálek, 1905 | Taeniopterygid winter stoneflies | 8 | Species | Taxom |
| Taiophlebiidae Martins-Neto, 2007 | | 1 | Species | Taxom |
| Tanaostigmatidae Howard, 1890 | Tanaostigmatid wasps | 24 | Species | Taxom |
| Tanyderidae Alexander, 1919 | Primitive crane flies | 1 | Species | Taxom |
| Tanypezidae Rondani, 1856 | Stretched-foot flies | 15 | Species | Taxom |
| Tarachodidae Handlirsch, 1930 | | 1 | Species | Taxom |
| Telegeusidae (LeConte, 1861) | Glowworm beetles | 1 | Species | Taxom |
| Tenebrionidae Latreille, 1802 | Darkling Beetle | 265 | Species | Taxom |
| Tenthredinidae Latreille, 1804 | Common sawflies | 37 | Species | Taxom |
| Tephritidae Newman, 1834 | Fruit flies | 566 | Species | Taxom |
| Teratembiidae Krauss, 1911 | | 11 | Species | Taxom |
| Teratomyzidae Hennig, 1969 | Fern Flies | 1 | Species | Taxom |
| Termitaphididae Myers, 1924 | Termite bug | 2 | Species | Taxom |
| Termitidae Latreille, 1802 | Higher termites | 436 | Species | Taxom |
| Tessaratomidae Stål, 1864 | Giant shield bug | 3 | Species | Taxom |
| Tethinidae (Hendel, 1916) | Tethinid flies | 19 | Species | Taxom |
| Tetratomidae Billberg, 1820 | Polypore fungus beetle | 6 | Species | Taxom |
| Tetrigidae Rambur, 1838 | Groundhoppers | 136 | Species | Taxom |
| Tettigarctidae Distant, 1905 | Hairy cicada | 3 | Species | Taxom |
| Tettigometridae Germar, 1821 | | 2 | Species | Taxom |
| Tettigoniidae Krauss, 1902 | Bush crickets | 1357 | Species | Taxom |
| Thaumastocoridae Kirkaldy, 1908 | Palm bug | 0 | Species | Taxom |
| Thaumatoneuridae Fraser, 1957 | | 4 | Species | Taxom |
| Therevidae Newman, 1834 | Stiletto flies | 77 | Species | Taxom |
| Thespidae Giglio-Tos, 1919 | | 110 | Species | Taxom |
| Thripidae Stevens, 1829 | Common thrips | 209 | Species | Taxom |
| Throscidae Laporte, 1840 | False metallic wood-boring beetles | 18 | Species | Taxom |
| Thynnidae Shuckard, 1841 | Thynnid Wasps | 20 | Species | Taxom |
| Thyreocoridae Amyot and Se..., 1843 | Black bugs | 13 | Species | Taxom |
| Thyrididae Herrich-Schä..., 1846 | Picture Winged Leaf Moths | 30 | Species | Taxom |
| Tineidae Latreille, 1810 | & Allies | 304 | Species | Taxom |
| Tingidae Laporte, 1832 | Lace bug | 504 | Species | Taxom |
| Tiphiidae Leach, 1815 | Flower wasps | 51 | Species | Taxom |
| Tipulidae Latreille, 1802 | Crane Flies | 2470 | Species | Taxom |
| Tischeriidae Spuler, 1898 | Lyonetiid moths | 3 | Species | Taxom |
| Torridincolidae Steffan, 1964 | | 29 | Species | Taxom |
| Tortricidae Latreille, 1803 | Bell Moths | 1871 | Species | Taxom |
| Torymidae Walker, 1833 | Apple seed chalcids | 30 | Species | Taxom |
| Triassoblattidae Durden, 1969 | | 1 | Species | Taxom |
| Trichodectidae Kellogg, 1896 | | 49 | Species | Taxom |
| Trichogrammatidae Haliday, 1851 | Trichogrammatid wasps | 47 | Species | Taxom |
| Trichopsocidae Pearman, 1936 | Lash-faced psocid | 1 | Species | Taxom |
| Tricorythidae Lestage, 1942 | Little stout crawler mayflies | 1 | Species | Taxom |
| Tridactylidae Saussure, 1874 | Pygmy mole cricket | 28 | Species | Taxom |
| Trigonalidae (Cresson, 1887) | Trigonalid sawflies | 0 | Species | Taxom |
| Trigonidiidae (Saussure, 1870) | And Ground Crickets | 102 | Species | Taxom |
| Trimenoponidae Harrison, 1916 | | 18 | Species | Taxom |
| Triozidae Löw, 1879 | Jumping plant lice | 60 | Species | Taxom |
| Tristiridae Rehn, 1906 | | 9 | Species | Taxom |
| Troctopsocidae Mockford, 1967 | | 5 | Species | Taxom |
| Trogidae (MacLeay, 1819) | Gnawer beetles | 44 | Species | Taxom |
| Trogossitidae Latreille, 1802 | Bark gnawing beetle | 56 | Species | Taxom |
| Tropiduchidae Stål, 1866 | Tropiduchid Planthoppers | 34 | Species | Taxom |
| Tryonicidae McKittrick &..., 1965 | | 1 | Species | Taxom |
| Ulidiidae Macquart, 1835 | Picture-winged Flies | 18 | Species | Taxom |
| Ulopidae (Le Peletier ..., 1825) | | 0 | Species | Taxom |
| Umenocoleidae Chen & Tian, 1973 | | 5 | Species | Taxom |
| Undopterigidae (Kozlov, 1988) | | 2 | Species | Taxom |
| Uraniidae Blanchard, 1845 | Swallowtail Moths | 63 | Species | Taxom |
| Urodidae Kyrki, 1984 | False Burnet Moths | 4 | Species | Taxom |
| Veliidae Amyot & Serv..., 1843 | Broad-shouldered bugs | 216 | Species | Taxom |
| Vermileonidae Williston, 1886 | Wormlion | 1 | Species | Taxom |
| Vesperidae Mulsant, 1839 | Vesperid longicorn beetles | 25 | Species | Taxom |
| Vespidae Leach, 1815 | And Allies | 795 | Species | Taxom |
| Xenidae Pohl & Beutel, 2005 | | 17 | Species | Taxom |
| Xiphocentronidae Schmid, 1982 | | 15 | Species | Taxom |
| Xiphydriidae Leach, 1819 | Wood wasps | 4 | Species | Taxom |
| Xyelidae Newman, 1835 | Sawfly | 1 | Species | Taxom |
| Xylomyidae Verrall, 1901 | Wood soldier flies | 6 | Species | Taxom |
| Xylophagidae Fallen, 1810 | Awl-flies | 10 | Species | Taxom |
| Xyloryctidae Meyrick, 1890 | Flower Moths | 10 | Species | Taxom |
| Yponomeutidae Stephens, 1829 | Ermine Moths | 15 | Species | Taxom |
| Zhangsolvidae Nagatomi & Yang, 1998 | | 3 | Species | Taxom |
| Zopheridae Solier, 1834 | Cylindrical bark beetles | 93 | Species | Taxom |
| Zorotypidae Silvestri, 1913 | Angel insects | 10 | Species | Taxom |
| Zygaenidae Latreille, 1809 | Burnet Forester | 25 | Species | Taxom |
