| Acanthosomatidae Signoret, 1864 | Acanthosomatids | 5 | Species | Taxom |
| Acartophthalmidae Czerny, 1928 | Acartophthalmid flies | 2 | Species | Taxom |
| Achilidae Stål, 1866 | Achilid Planthoppers | 12 | Species | Taxom |
| Acrididae MacLeay, 1819 | Grasshoppers and locusts | 47 | Species | Taxom |
| Acroceridae Leach, 1815 | Hunch-back flies | 8 | Species | Taxom |
| Adelgidae Heinze, 1962 | Adelgids | 1 | Species | Taxom |
| Adelidae Bruand, 1851 | Adelid Moths | 6 | Species | Taxom |
| Ademosynidae Ponomarenko, 1968 | | 5 | Species | Taxom |
| Aderidae Winkler, 1927 | Ant-like leaf beetles | 9 | Species | Taxom |
| Aeolothripidae Uzel, 1895 | Banded thrips | 2 | Species | Taxom |
| Aerophasmidae Martynov, 1928 | | 1 | Species | Taxom |
| Aeschnidiidae Needham, 1903 | Small darner | 9 | Species | Taxom |
| Aeshnidae Rambur, 1842 | Darners | 70 | Species | Taxom |
| Aetalionidae Spinola, 1850 | Treehopper | 2 | Species | Taxom |
| Agaonidae Walker, 1848 | Fig wasp | 6 | Species | Taxom |
| Agathemeridae Bradler, 2003 | | 1 | Species | Taxom |
| Agromyzidae Fallen, 1823 | Leaf miner flies | 10 | Species | Taxom |
| Agyrtidae Thomson, 1859 | Primitive carrion beetles | 5 | Species | Taxom |
| Aktassiidae Pritykina, 1968 | | 3 | Species | Taxom |
| Aleyrodidae Westwood, 1840 | Whiteflies | 8 | Species | Taxom |
| Alydidae Amyot & Serv..., 1843 | Bean bugs | 23 | Species | Taxom |
| Ameletidae McCafferty, 1991 | Combmouthed Minnow Mayflies | 1 | Species | Taxom |
| Ameletopsidae Edmunds, 1957 | | 1 | Species | Taxom |
| Ametropodidae Bengtsson, 1913 | Sand minnow mayflies | 1 | Species | Taxom |
| Amphientomidae Enderlein, 1903 | Tropical Barklice | 5 | Species | Taxom |
| Amphipsocidae Mockford, 1978 | Hairy-winged Barklice | 1 | Species | Taxom |
| Amphipterygidae Selys, 1853 | | 2 | Species | Taxom |
| Ampulicidae Shuckard, 1840 | Ampulicid wasps | 3 | Species | Taxom |
| Anaxyelidae Martynov, 1925 | Anaxyelids | 2 | Species | Taxom |
| Andrenidae Webster, 1913 | Andrenid bees | 14 | Species | Taxom |
| Angarosphecidae Rasnitsyn, 1975 | | 1 | Species | Taxom |
| Anisembiidae Davis, 1940 | | 3 | Species | Taxom |
| Anisolabididae Verhoeff, 1902 | | 5 | Species | Taxom |
| Anisopodidae Knab, 1912 | Window Midges | 26 | Species | Taxom |
| Antefungivoridae Rohdendorf, 1938 | | 5 | Species | Taxom |
| Anthicidae Latreille, 1819 | Ant beetles | 11 | Species | Taxom |
| Anthocoridae Fieber, 1837 | Flower bugs | 12 | Species | Taxom |
| Anthomyiidae Robineau-Des..., 1830 | Anthomyiid flies | 13 | Species | Taxom |
| Anthomyzidae Czerny, 1903 | Anthomyzid flies | 13 | Species | Taxom |
| Anthophoridae (C. L. Koch, 1846) | | 1 | Species | Taxom |
| Anthribidae Billberg, 1820 | Fungus Weevil | 53 | Species | Taxom |
| Apataniidae Wallengren, 1886 | Early Smoky Wing Sedges | 3 | Species | Taxom |
| Aphalaridae Löw, 1879 | | 24 | Species | Taxom |
| Aphelinidae Thomson, 1876 | Aphelinid wasps | 3 | Species | Taxom |
| Aphelocheiridae Fieber, 1851 | | 1 | Species | Taxom |
| Aphididae Latreille, 1802 | Aphids | 127 | Species | Taxom |
| Aphrophoridae Evans, 1946 | Froghoppers | 30 | Species | Taxom |
| Apidae Latreille, 1802 | Bumble bees | 104 | Species | Taxom |
| Aradidae Spinola, 1837 | Flat bug | 48 | Species | Taxom |
| Archegocimicidae Handlirsch, 1906 | | 6 | Species | Taxom |
| Archijassidae Becker-Migdi..., 1962 | | 3 | Species | Taxom |
| Archimylacridae Handlirsch, 1906 | | 3 | Species | Taxom |
| Archipseudophasmatidae Zompro, 2001 | | 3 | Species | Taxom |
| Archipsocidae Enderlein, 1903 | Ancient Barklice | 2 | Species | Taxom |
| Archipsyllidae Handlirsch, 1908 | | 1 | Species | Taxom |
| Archisargidae Rohdendorf, 1962 | | 2 | Species | Taxom |
| Archizelmiridae Rohdendorf, 1962 | | 1 | Species | Taxom |
| Archotermopsidae Engel, Grima..., 2009 | Rottenwood Termites | 2 | Species | Taxom |
| Arctiidae Leach, 1815 | Footman moths | 1 | Species | Taxom |
| Argidae Konow, 1890 | Argid flies | 8 | Species | Taxom |
| Arnoldidae Koteja, 2008 | | 2 | Species | Taxom |
| Artematopodidae Lacordaire, 1857 | Soft bodied plant beetle | 7 | Species | Taxom |
| Artheneidae Stål, 1872 | | 1 | Species | Taxom |
| Arthropleidae Balthasar, 1937 | Flatheaded Mayflies | 1 | Species | Taxom |
| Ascalaphidae Rambur, 1842 | Owlflies | 7 | Species | Taxom |
| Asilidae Latreille, 1802 | Assassin flies | 62 | Species | Taxom |
| Asteiidae Rondani, 1856 | Asteiid Flies | 1 | Species | Taxom |
| Atelestidae Hennig, 1970 | | 1 | Species | Taxom |
| Athericidae Stuckenberg, 1973 | Athericid flies | 7 | Species | Taxom |
| Attelabidae Billberg, 1820 | Leaf Rolling Weevil | 70 | Species | Taxom |
| Aulacidae Shuckard, 1842 | Aulacid wasps | 11 | Species | Taxom |
| Aulacigastridae Wollaston, 1864 | Aulacigastrid flies | 1 | Species | Taxom |
| Austroperilestidae Petruleviciu..., 2005 | | 1 | Species | Taxom |
| Autostichidae Le Marchand, 1947 | Autostichid Moths | 2 | Species | Taxom |
| Axymyiidae Rohdendorf, 1946 | Axymyiidae flies | 1 | Species | Taxom |
| Babidae Kluge, Godun..., 2006 | | 1 | Species | Taxom |
| Bacunculidae (Brunner, 1893) | | 1 | Species | Taxom |
| Baetidae Leach, 1815 | Mayflies | 5 | Species | Taxom |
| Baetiscidae Banks, 1900 | Armored Mayflies | 2 | Species | Taxom |
| Baissoferidae Sukatsheva, 1968 | | 1 | Species | Taxom |
| Baissogryllidae Gorochov, 1985 | | 4 | Species | Taxom |
| Bajanzhargalanidae Storozhenko, 1992 | | 1 | Species | Taxom |
| Baleyopterygidae N.D. Siniche..., 1985 | | 8 | Species | Taxom |
| Belidae Schönherr, 1826 | Belid Beetle | 12 | Species | Taxom |
| Belostomatidae Leach, 1815 | Alligator ticks | 13 | Species | Taxom |
| Beraeidae Wallengren, 1891 | Small eastern caddisflies | 3 | Species | Taxom |
| Berendtimiridae Winkler, 1987 | | 1 | Species | Taxom |
| Berothidae Handlirsch, 1906 | Beaded lacewing | 5 | Species | Taxom |
| Berytidae Fieber, 1851 | Stilt bug | 2 | Species | Taxom |
| Bethylidae Halliday, 1839 | Bethylid wasps | 54 | Species | Taxom |
| Bethylonymidae Rasnitsyn, 1975 | | 1 | Species | Taxom |
| Bibionidae Fleming, 1821 | Bibionid flies | 348 | Species | Taxom |
| Bintoniellidae Handlirsch, 1937 | | 1 | Species | Taxom |
| Biphyllidae LeConte, 1861 | Biphyllid beetles | 1 | Species | Taxom |
| Bittacidae Handlirsch, 1906 | Hanging scorpionflies | 18 | Species | Taxom |
| Blaberidae Saussure, 1864 | Blaberids | 10 | Species | Taxom |
| Blasticotomidae Thomson, 1871 | Blasticotomid sawflies | 1 | Species | Taxom |
| Blattellidae (Karny, 1908) | German Cockroach | 7 | Species | Taxom |
| Blattidae Stephens, 1829 | American cockroaches | 20 | Species | Taxom |
| Blattocoleidae Zeuner, 1933 | | 2 | Species | Taxom |
| Blattulidae Vishnyokova, 1982 | | 7 | Species | Taxom |
| Blephariceridae Loew, 1861 | Mountain midges | 5 | Species | Taxom |
| Blissidae Stål, 1862 | Chinch Bugs | 1 | Species | Taxom |
| Bohartillidae Kinzelbach, 1969 | | 3 | Species | Taxom |
| Boholdoyidae Kovalev, 1985 | | 2 | Species | Taxom |
| Bolcacorduliidae Gentilini, 2002 | | 1 | Species | Taxom |
| Bolcathoridae Gentilini, 2002 | | 1 | Species | Taxom |
| Boleopsidae Kirejtshuk &..., 2013 | | 1 | Species | Taxom |
| Bombycidae Latreille, 1802 | Lappet moths | 2 | Species | Taxom |
| Bombyliidae Latreille, 1802 | Bee Flies | 65 | Species | Taxom |
| Boreidae Latreille, 1816 | Snow fleas | 1 | Species | Taxom |
| Bostrichidae Latreille, 1802 | Auger beetles | 9 | Species | Taxom |
| Bothrideridae Erichson, 1845 | Cocoon-forming beetles | 4 | Species | Taxom |
| Brachycentridae Ulmer, 1903 | Humpless Casemaker Caddisflies | 3 | Species | Taxom |
| Brachyceritidae Hong, 2002 | | 1 | Species | Taxom |
| Brachycleistogastridae (Kovalev, 1994) | | 4 | Species | Taxom |
| Brachypsectridae LeConte & Horn, 1883 | Texas beetle | 1 | Species | Taxom |
| Brachypteridae (Erichson, 1845) | Short-winged Flower Beetles | 3 | Species | Taxom |
| Brachystomatidae Melander, 1908 | | 2 | Species | Taxom |
| Braconidae Latreille, 1829 | Braconid wasps | 228 | Species | Taxom |
| Brentidae Billberg, 1820 | Brenthidae | 38 | Species | Taxom |
| Breyeriidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Brongniartiellidae Martynova, 1949 | | 4 | Species | Taxom |
| Buprestidae Leach, 1815 | Flat-headed wood-borers | 160 | Species | Taxom |
| Byrrhidae Latreille, 1804 | Moss beetles | 33 | Species | Taxom |
| Caeciliusidae Kolbe, 1880 | Lizard Barklice | 11 | Species | Taxom |
| Calamoceratidae Ulmer, 1905 | | 4 | Species | Taxom |
| Caliscelidae Amyot & Serv..., 1843 | Piglet Bugs | 1 | Species | Taxom |
| Callaphididae (Borner, 1952) | | 6 | Species | Taxom |
| Calliphoridae Brauer & Ber..., 1889 | Blow flies | 2 | Species | Taxom |
| Caloblattinidae Vršanský & A..., 2000 | | 1 | Species | Taxom |
| Calopterygidae Selys, 1850 | Broad-winged damselflies | 6 | Species | Taxom |
| Camillidae Frey, 1921 | Camillid flies | 2 | Species | Taxom |
| Campterophlebiidae Handlirsch, 1920 | | 3 | Species | Taxom |
| Cantacaderidae (Stal, 1873) | | 1 | Species | Taxom |
| Cantharidae Imhoff, 1856 | Cantharids | 54 | Species | Taxom |
| Capniidae Klapálek, 1905 | Capniid winter stoneflies | 4 | Species | Taxom |
| Capsidae (Hunt, 1979) | | 1 | Species | Taxom |
| Carabidae Latreille, 1802 | Carabid beetles | 513 | Species | Taxom |
| Carcinophoridae Hincks, 1954 | | 1 | Species | Taxom |
| Caridae Thompson, 1992 | | 12 | Species | Taxom |
| Carnidae Newman, 1834 | Bird flies | 2 | Species | Taxom |
| Castniidae Boisduval, 1828 | Castniid moths | 1 | Species | Taxom |
| Cecidomyiidae Newman, 1834 | Forest Midges | 145 | Species | Taxom |
| Cephidae Newman, 1834 | Cephids | 7 | Species | Taxom |
| Cerambycidae Latreille, 1802 | Long Horn beetles | 146 | Species | Taxom |
| Ceraphronidae Haliday, 1833 | Ceraphronid wasps | 1 | Species | Taxom |
| Ceratocombidae Fieber, 1861 | | 2 | Species | Taxom |
| Ceratopogonidae Newman, 1834 | Biting midge | 180 | Species | Taxom |
| Cercopidae Leach, 1815 | Froghopper | 49 | Species | Taxom |
| Cerophytidae Latreille, 1834 | Cerophytid beetles | 1 | Species | Taxom |
| Cerylonidae Billberg, 1820 | Cerylid Kingfishers | 1 | Species | Taxom |
| Chaeteessidae Handlirsch, 1920 | | 2 | Species | Taxom |
| Chalcididae Latreille, 1817 | Chalcidid wasps | 6 | Species | Taxom |
| Chamaemyiidae Hendel, 1910 | Aphid flies | 1 | Species | Taxom |
| Chaoboridae Newman, 1834 | Phantom midge | 28 | Species | Taxom |
| Chelisochidae Burr, 1907 | Black earwig | 1 | Species | Taxom |
| Chelonariidae Blanchard, 1845 | Chelonarid beetles | 1 | Species | Taxom |
| Chimeromyiidae Grimaldi & C..., 2009 | | 1 | Species | Taxom |
| Chironomidae Erichson, 1842 | Chironomids | 241 | Species | Taxom |
| Chlorolestidae (Fraser, 1960) | | 1 | Species | Taxom |
| Chloroperlidae Okamoto, 1912 | Green stoneflies | 7 | Species | Taxom |
| Chloropidae Schoenherr, 1840 | Chloropid flies | 6 | Species | Taxom |
| Choristidae Esben-Petersen, 1915 | | 1 | Species | Taxom |
| Chorotypidae Stål, 1873 | | 1 | Species | Taxom |
| Chresmodidae Haase, 1890 | | 1 | Species | Taxom |
| Chrysididae Latreille, 1802 | Chrysidid wasps | 8 | Species | Taxom |
| Chrysomelidae Latreille, 1802 | Casebearers | 314 | Species | Taxom |
| Chrysopidae Schneider, 1851 | And Green Lacewings | 35 | Species | Taxom |
| Chyromyidae Hendel, 1916 | Chiromyid flies | 1 | Species | Taxom |
| Cicadellidae Latreille, 1802 | Cicadellids | 94 | Species | Taxom |
| Cicadidae Westwood, 1840 | Cicada | 28 | Species | Taxom |
| Cicadomorphidae Handlirsch, 1906 | Giant cicadas | 2 | Species | Taxom |
| Ciidae Leach, 1819 | Minute tree fungus beetles | 1 | Species | Taxom |
| Cimbicidae Kirby, 1837 | Cimbicid sawflies | 17 | Species | Taxom |
| Cimbrophlebiidae Willmann, 1977 | Hangingfly | 6 | Species | Taxom |
| Cixiidae Spinola, 1839 | Cixid planthoppers | 40 | Species | Taxom |
| Clastopteridae Stål, 1858 | Clastopterid Spittlebugs | 4 | Species | Taxom |
| Cleridae Latreille, 1802 | Checkered Beetle | 32 | Species | Taxom |
| Clusiidae Schönherr, 1840 | Clusiid flies | 4 | Species | Taxom |
| Coccinellidae Latreille, 1807 | Coccinelles | 37 | Species | Taxom |
| Coenagrionidae Kirby, 1890 | Narrow-winged damselflies | 21 | Species | Taxom |
| Coleophoridae Hübner, 1825 | Case moths | 2 | Species | Taxom |
| Colletidae Lepeletier, 1841 | Colletid bees | 2 | Species | Taxom |
| Coniopterygidae Burmeister, 1839 | Dusty lacewings | 14 | Species | Taxom |
| Conopidae Latreille, 1802 | Thick-headed Flies | 3 | Species | Taxom |
| Copromorphidae Meyrick, 1905 | Fig Borers | 1 | Species | Taxom |
| Coptoclavidae Ponomarenko, 1961 | Extinct family | 9 | Species | Taxom |
| Cordulegasteridae | | 3 | Species | Taxom |
| Cordulephyidae Tillyard, 1917 | | 1 | Species | Taxom |
| Corduliidae Selys-Longch..., 1850 | Baskettails | 15 | Species | Taxom |
| Coreidae Leach, 1815 | Broad-headed bugs | 45 | Species | Taxom |
| Corioxenidae Kinzelbach, 1970 | | 1 | Species | Taxom |
| Corixidae Leach, 1815 | Lesser Water-Boatman | 27 | Species | Taxom |
| Corydalidae Burmeister, 1839 | Dobsonflies | 3 | Species | Taxom |
| Corydasialidae Wichard & al., 2005 | | 2 | Species | Taxom |
| Corydiidae de Saussure, 1864 | Sand cockroaches | 11 | Species | Taxom |
| Corylophidae LeConte, 1852 | Hooded beetles | 2 | Species | Taxom |
| Cossidae Leach, 1815 | Borers | 4 | Species | Taxom |
| Crabronidae Latreille, 1802 | Bee Wolves | 51 | Species | Taxom |
| Crambidae Latreille, 1810 | Crambid Snout Moths | 3 | Species | Taxom |
| Cryptochetidae Brues & Mela..., 1932 | Cryptochetid Flies | 1 | Species | Taxom |
| Cryptophagidae Kirby, 1937 | Mould beetles | 19 | Species | Taxom |
| Ctenophthalmidae Rothschild, 1915 | | 4 | Species | Taxom |
| Cucujidae Latreille, 1802 | Flat bark beetles | 11 | Species | Taxom |
| Culicidae Meigen, 1818 | Mosquito | 24 | Species | Taxom |
| Cupedidae Laporte, 1836 | Cupedids | 27 | Species | Taxom |
| Curculionidae Latreille, 1802 | Ambrosia beetles | 694 | Species | Taxom |
| Curtonotidae Duda, 1934 | Curtonotid flies | 3 | Species | Taxom |
| Cydnidae Billberg, 1820 | Burrower bugs | 65 | Species | Taxom |
| Cylindrotomidae (Mulsant, 1842) | Cylindrotomid Crane Flies | 9 | Species | Taxom |
| Cymatophlebiidae Handlirsch, 1906 | | 6 | Species | Taxom |
| Cynipidae Latreille, 1802 | Cynipid gall wasps | 12 | Species | Taxom |
| Cypselosomatidae Hennig, 1958 | Cypselosomatid flies | 1 | Species | Taxom |
| Dascillidae Guérin-Ménev..., 1843 | Orchid beetles | 12 | Species | Taxom |
| Delphacidae Leach, 1815 | Delphacid planthoppers | 7 | Species | Taxom |
| Derbidae Spinola, 1839 | Derbid planthoppers | 9 | Species | Taxom |
| Dermapteridae Vishniakova, 1980 | | 1 | Species | Taxom |
| Dermestidae Hope, 1840 | Carpet beetles | 46 | Species | Taxom |
| Derodontidae LeConte, 1861 | Tooth-neck fungus beetles | 1 | Species | Taxom |
| Diapheromeridae Rehn & Hebard, 1909 | Diapheromerid Stick Insects | 1 | Species | Taxom |
| Diapriidae Latreille, 1796 | Diapriid wasps | 20 | Species | Taxom |
| Diaspididae Maskell, 1878 | Armored scale insects | 2 | Species | Taxom |
| Diastatidae Hendel, 1917 | Bog flies | 4 | Species | Taxom |
| Dictyopharidae Spinola, 1839 | Dictyopharid Planthoppers | 8 | Species | Taxom |
| Dilaridae Newman, 1853 | Pleasing lacewing | 1 | Species | Taxom |
| Dinopanorpidae Carpenter, 1972 | | 8 | Species | Taxom |
| Diopsidae Billberg, 1820 | Stalk-eyed flies | 3 | Species | Taxom |
| Diplatyidae (Verhoeff, 1902) | | 1 | Species | Taxom |
| Diprionidae Rohwer, 1911 | Conifer sawflies | 2 | Species | Taxom |
| Dipseudopsidae Ulmer, 1904 | | 3 | Species | Taxom |
| Ditomyiidae Keilin, 1919 | | 1 | Species | Taxom |
| Dixidae Schiner, 1868 | Dixid Midges | 10 | Species | Taxom |
| Dolichopodidae Latreille, 1809 | Long legged flies | 119 | Species | Taxom |
| Drepanochaitophoridae Zhang & Hong, 1999 | | 1 | Species | Taxom |
| Drosophilidae Rondani, 1856 | Fruit flies | 11 | Species | Taxom |
| Dryinidae Haliday, 1840 | Dryinid wasps | 38 | Species | Taxom |
| Dryomyzidae Schiner, 1862 | Dryomyzid flies | 4 | Species | Taxom |
| Dryophthoridae (Schönherr, 1825) | Palm weevils | 1 | Species | Taxom |
| Dryopidae Billberg, 1820 | Long toed water beetle | 8 | Species | Taxom |
| Dysoneuridae Sukatsheva, 1968 | | 3 | Species | Taxom |
| Dytiscidae Leach, 1815 | Diving beetles | 133 | Species | Taxom |
| Ecnomidae Ulmer, 1903 | | 20 | Species | Taxom |
| Ectobiidae (Brunner von ..., 1865) | Wood cockroaches | 9 | Species | Taxom |
| Elachistidae Bruand, 1851 | Elachistid moths | 10 | Species | Taxom |
| Elateridae Leach, 1815 | Click Beetle | 216 | Species | Taxom |
| Elcanidae Handlirsch, 1906 | | 10 | Species | Taxom |
| Electrentomidae Enderlein, 1911 | | 4 | Species | Taxom |
| Electrotomidae Rasnitsyn, 1977 | | 1 | Species | Taxom |
| Elektraphididae Steffan, 1968 | | 10 | Species | Taxom |
| Elenchidae Perkins, 1905 | | 1 | Species | Taxom |
| Elipsocidae Pearman, 1936 | Damp Barklice | 1 | Species | Taxom |
| Elmidae Curtis, 1830 | Drive beetles | 16 | Species | Taxom |
| Embiidae Burmeister, 1839 | | 2 | Species | Taxom |
| Embolemidae Förster, 1856 | Embolemid wasps | 3 | Species | Taxom |
| Empheriidae Enderlein, 1906 | | 2 | Species | Taxom |
| Empididae Latreille, 1809 | Balloon flies | 92 | Species | Taxom |
| Encyrtidae Walker, 1837 | Encyrtid wasps | 13 | Species | Taxom |
| Endomychidae Leach, 1815 | False Ladybirds | 5 | Species | Taxom |
| Eneopteridae (Saussure, 1893) | Bush cricket | 1 | Species | Taxom |
| Enicocephalidae Stål, 1860 | Gnat bug | 8 | Species | Taxom |
| Ensiferophasmatidae Zompro, 2005 | | 1 | Species | Taxom |
| Eoichneumonidae (Jell & Duncan, 1986) | | 1 | Species | Taxom |
| Eolepidopterigidae Rasnitsyn, 1983 | | 3 | Species | Taxom |
| Eomeropidae Cockerell, 1909 | | 4 | Species | Taxom |
| Eophlebomyiidae Cockerell, 1925 | | 1 | Species | Taxom |
| Eorpidae Archibald & al., 2013 | | 3 | Species | Taxom |
| Eostephanitidae Hong, 2002 | | 1 | Species | Taxom |
| Epallagidae Needham, 1903 | | 10 | Species | Taxom |
| Ephemerellidae (Klapálek, 1909) | Blue-Winged Olive Ephemerellidae | 3 | Species | Taxom |
| Ephemeridae Leach, 1817 | Burrowing mayflies | 13 | Species | Taxom |
| Ephialtitidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Ephydridae Zetterstedt, 1837 | Brine flies | 2 | Species | Taxom |
| Epipsocidae | Elliptical bark louse | 2 | Species | Taxom |
| Episactidae Burr, 1899 | | 1 | Species | Taxom |
| Erebidae Leach, 1815 | Erebid Moths | 3 | Species | Taxom |
| Erichschmidtiidae Bechly, 1996 | | 0 | Species | Taxom |
| Eriococcidae Cockerell, 1899 | Eriococcid scales | 5 | Species | Taxom |
| Eriocraniidae Rebel, 1901 | Eriocraniid moths | 1 | Species | Taxom |
| Erotylidae Latreille, 1802 | Pleasing Fungus Beetle | 9 | Species | Taxom |
| Eucharitidae Latreille, 1809 | Eucharitid wasp | 1 | Species | Taxom |
| Eucinetidae Lacordaire, 1857 | Plate-thigh beetle | 5 | Species | Taxom |
| Eucnemidae Eschscholtz, 1829 | Click Beetles | 23 | Species | Taxom |
| Eulophidae Westwood, 1829 | Eulophid wasps | 5 | Species | Taxom |
| Eumastacidae Burr, 1898 | Matchstick grasshoppers | 5 | Species | Taxom |
| Eumorbaeschnidae Bechly, 1996 | | 2 | Species | Taxom |
| Eupelmidae Walker, 1833 | Eupelmid wasps | 5 | Species | Taxom |
| Euphaeidae Jacobson & B..., 1905 | Gossamerwings | 2 | Species | Taxom |
| Eurybrachidae Stål, 1862 | | 1 | Species | Taxom |
| Eurytomidae Walker, 1832 | Eurytomid wasps | 8 | Species | Taxom |
| Evaniidae Latreille, 1802 | Ensign wasp | 8 | Species | Taxom |
| Expansicornidae Hong, 2002 | | 1 | Species | Taxom |
| Figitidae Thomson, 1862 | Figitid wasps | 4 | Species | Taxom |
| Flatidae Spinola, 1839 | Flatid planthoppers | 6 | Species | Taxom |
| Forficulidae Stephens, 1829 | Common Earwig | 24 | Species | Taxom |
| Formicidae Latreille, 1809 | Ants | 697 | Species | Taxom |
| Frenguelliidae Petruleviciu..., 2003 | | 2 | Species | Taxom |
| Fulgoridae Latreille, 1807 | Fulgorid Planthopper | 20 | Species | Taxom |
| Fulgoridiidae Handlirsch, 1939 | | 1 | Species | Taxom |
| Fungivoritidae Rohdendorf, 1957 | | 1 | Species | Taxom |
| Galgulidae | | 1 | Species | Taxom |
| Gallophasmatidae Nel & al., 2010 | | 1 | Species | Taxom |
| Geinitziidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Genaphididae Handlirsch, 1907 | | 1 | Species | Taxom |
| Geocoridae Baerensprung, 1860 | Big-eyed Bugs | 2 | Species | Taxom |
| Geometridae Leach, 1815 | Cankerworm moths | 8 | Species | Taxom |
| Geotrupidae Latreille, 1802 | Dor beetles | 8 | Species | Taxom |
| Geraridae Scudder, 1885 | | 1 | Species | Taxom |
| Gerridae Leach, 1815 | Jesus bugs | 19 | Species | Taxom |
| Glaphyridae MacLeay, 1819 | Bumble bee scarab beetle | 5 | Species | Taxom |
| Glaphyropteridae Pongracz, 1935 | | 16 | Species | Taxom |
| Glaresidae Kolbe, 1905 | Enigmatic scarab beetle | 2 | Species | Taxom |
| Glossinidae Theobald, 1903 | Tik-tik flies | 2 | Species | Taxom |
| Glossosomatidae Wallengren, 1891 | Little Black Caddisflies | 10 | Species | Taxom |
| Goeridae Ulmer, 1903 | | 4 | Species | Taxom |
| Gomphaeschnidae Tillyard & F..., 1940 | | 1 | Species | Taxom |
| Gomphidae Rambur, 1842 | Club-tailed dragonflies | 14 | Species | Taxom |
| Gracillariidae Stainton, 1854 | Blotch leaf miner moths | 2 | Species | Taxom |
| Grammolingiidae Ren, 2002 | | 2 | Species | Taxom |
| Gripopterygidae Enderlein, 1909 | | 1 | Species | Taxom |
| Grohnidae Koteja, 2008 | | 1 | Species | Taxom |
| Gryllacrididae Blanchard, 1845 | Camel Crickets | 6 | Species | Taxom |
| Gryllidae Bolivar, 1878 | Crickets | 17 | Species | Taxom |
| Gryllotalpidae Saussure, 1870 | Mole cricket | 8 | Species | Taxom |
| Gyrinidae Latreille, 1802 | Whirligig beetle | 18 | Species | Taxom |
| Haglidae Handlirsch, 1906 | Hump-winged cricket | 4 | Species | Taxom |
| Halictidae Thomson, 1869 | Flower bees | 23 | Species | Taxom |
| Haliplidae Aubé, 1836 | Crawling Water Beetle | 2 | Species | Taxom |
| Hebridae Amyot and Se..., 1843 | Velvet water bug | 2 | Species | Taxom |
| Heleomyzidae (Westwood, 1840) | Heleomyzid flies | 17 | Species | Taxom |
| Helicopsychidae Ulmer, 1912 | Snail Case caddisflies | 17 | Species | Taxom |
| Heloridae Förster, 1856 | Helorid wasps | 1 | Species | Taxom |
| Helotidae Reitter, 1876 | | 3 | Species | Taxom |
| Hemerobiidae Latreille, 1802 | Brown Lacewing | 21 | Species | Taxom |
| Hemiphlebiidae Fraser, 1960 | Ancient greenling | 1 | Species | Taxom |
| Hepialidae Stephens, 1829 | Ghost Moths | 3 | Species | Taxom |
| Heptageniidae Needham, 1901 | Flat-Bodied Up-Wings Heptageniidae | 16 | Species | Taxom |
| Hesperiidae Latreille, 1809 | Skipper | 7 | Species | Taxom |
| Hesperinidae Hendel, 1928 | | 4 | Species | Taxom |
| Heteroceridae MacLeay, 1825 | Mud beetles | 6 | Species | Taxom |
| Heterogastridae Stål, 1872 | | 9 | Species | Taxom |
| Heterothripidae Bagnall, 1912 | | 2 | Species | Taxom |
| Hexagenitidae Lameere, 1917 | | 6 | Species | Taxom |
| Hippoboscidae Samouelle, 1819 | Keds | 4 | Species | Taxom |
| Histeridae Gyllenhal, 1808 | Clown beetle | 23 | Species | Taxom |
| Hodotermitidae Desneux, 1904 | Harvester termites | 1 | Species | Taxom |
| Hoffeinsmyiidae Michelsen, 2009 | | 1 | Species | Taxom |
| Huaxiasciaritidae (Hong, 2002) | | 24 | Species | Taxom |
| Hybosoridae Erichson, 1847 | Pill scarab beetles | 8 | Species | Taxom |
| Hybotidae Meigen, 1820 | Dance flies | 32 | Species | Taxom |
| Hydraenidae Mulsant, 1844 | Cascade Beetles | 13 | Species | Taxom |
| Hydrobiosidae Ulmer, 1905 | | 13 | Species | Taxom |
| Hydrometridae Billberg, 1820 | Marsh treader | 10 | Species | Taxom |
| Hydrophilidae Latreille, 1802 | Silver Water Beetles | 142 | Species | Taxom |
| Hydropsychidae Curtis, 1835 | Net Spinning caddisflies | 17 | Species | Taxom |
| Hydroptilidae Stephens, 1836 | Micro caddisflies | 62 | Species | Taxom |
| Hygrobiidae Régimbart, 1878 | Screech beetles | 1 | Species | Taxom |
| Hylicellidae Evans, 1956 | | 0 | Species | Taxom |
| Hypolestidae Fraser, 1938 | | 3 | Species | Taxom |
| Hypsipterygidae Drake, 1961 | | 1 | Species | Taxom |
| Ibaliidae Thomson, 1862 | Ibaliid wasps | 3 | Species | Taxom |
| Ichneumonidae Latreille, 1802 | Ichneumon flies | 203 | Species | Taxom |
| Idelinellidae Storozhenko, 1997 | | 0 | Species | Taxom |
| Idionychidae Tillyard & F..., 1940 | | 1 | Species | Taxom |
| Incurvariidae Spuler, 1898 | Fairy moths | 1 | Species | Taxom |
| Inocelliidae Navas, 1913 | Inocelliid snakeflies | 6 | Species | Taxom |
| Ipsviciidae Tillyard, 1919 | | 1 | Species | Taxom |
| Isophlebiidae Handlirsch, 1908 | | 4 | Species | Taxom |
| Issidae Spinola, 1839 | Issid planthoppers | 3 | Species | Taxom |
| Ithonidae Newman, 1838 | Ithonid lacewings | 2 | Species | Taxom |
| Ithyceridae (Schönherr, 1826) | New York weevil | 1 | Species | Taxom |
| Jacobsoniidae Heller, 1926 | Jacobson's beetles | 3 | Species | Taxom |
| Jassidae Latreille, 1802 | | 6 | Species | Taxom |
| Juracorduliidae Bechly & Ueda, 2002 | | 1 | Species | Taxom |
| Juramantidae Vrsansky, 2002 | | 1 | Species | Taxom |
| Jurapriidae Rasnitsyn, 1983 | | 1 | Species | Taxom |
| Jurodidae Ponomarenko, 1985 | Jurodids | 3 | Species | Taxom |
| Kalligrammatidae Handlirsch, 1906 | | 5 | Species | Taxom |
| Kalophryganeidae Haupt, 1956 | | 1 | Species | Taxom |
| Kalotermitidae Froggatt, 1897 | Dampwood termites | 17 | Species | Taxom |
| Karabasiidae Popov, 1985 | | 2 | Species | Taxom |
| Kateretidae Kirkby, 1837 | Pollen Beetles | 2 | Species | Taxom |
| Kermesidae Signoret, 1875 | Gall-like Scale Insects | 1 | Species | Taxom |
| Keroplatidae Rondani, 1856 | Fungus gnats | 40 | Species | Taxom |
| Kinnaridae Muir, 1925 | Kinnarid Planthoppers | 3 | Species | Taxom |
| Kuwaniidae MacGillvray, 1921 | | 2 | Species | Taxom |
| Labiduridae Verhoeff, 1902 | Long-horned earwig | 2 | Species | Taxom |
| Lachesillidae Pearman, 1936 | Fateful Barklice | 1 | Species | Taxom |
| Lampyridae Latreille, 1817 | Fireflies | 6 | Species | Taxom |
| Lasiosynidae Kirejtshuk, ..., 2010 | | 10 | Species | Taxom |
| Latibasaliidae Petruleviciu..., 2004 | | 2 | Species | Taxom |
| Latridiidae Erichson, 1842 | Minute brown scavenger beetle | 24 | Species | Taxom |
| Lauxaniidae Macquart, 1835 | Beach flies | 5 | Species | Taxom |
| Leiodidae Fleming, 1821 | Round fungus beetles | 22 | Species | Taxom |
| Lepidopsocidae Lienhard & S..., 2002 | Scaly-winged bark louse | 1 | Species | Taxom |
| Lepidostomatidae Ulmer, 1903 | Bizarre Caddisflies | 16 | Species | Taxom |
| Leptoceridae Leach, 1815 | Long Horned caddisflies | 29 | Species | Taxom |
| Leptophlebiidae Banks, 1900 | Leptophlebiids | 19 | Species | Taxom |
| Leptopodidae Amyot and Se..., 1843 | Spiny shore bugs | 4 | Species | Taxom |
| Lestidae Calvert, 1901 | Spread-winged damselflies | 21 | Species | Taxom |
| Leucospidae Fabricius, 1775 | Leucospid wasps | 1 | Species | Taxom |
| Leuctridae Klapálek, 1905 | Needle Or Willow Stoneflies | 10 | Species | Taxom |
| Liadytidae Ponomarenko, 1977 | | 4 | Species | Taxom |
| Liassophlebiidae Tillyard, 1925 | Damsel-dragonflies | 1 | Species | Taxom |
| Libellulidae Rambur, 1842 | Chasers | 54 | Species | Taxom |
| Liberiblattinidae Vrsansky, 2002 | | 1 | Species | Taxom |
| Limnephilidae Kolenati, 1848 | Northern caddisflies | 29 | Species | Taxom |
| Limnichidae Erichson, 1846 | Minute marsh loving beetle | 3 | Species | Taxom |
| Limoniidae (Speiser, 1909) | Craneflies | 58 | Species | Taxom |
| Liomopteridae Sellards, 1909 | | 1 | Species | Taxom |
| Liposcelididae Enderlein, 1911 | Booklice | 6 | Species | Taxom |
| Lithoscarabaeidae Nikolajev, 1992 | | 1 | Species | Taxom |
| Lithuanicoccidae Koteja, 2008 | | 2 | Species | Taxom |
| Liupanshaniidae Bechly & al, 2001 | | 2 | Species | Taxom |
| Liviidae Low, 1879 | | 2 | Species | Taxom |
| Locustavidae Sharov, 1968 | | 1 | Species | Taxom |
| Locustopsidae Handlirsch, 1906 | | 4 | Species | Taxom |
| Lonchaeidae Loew, 1861 | Lance Flies | 2 | Species | Taxom |
| Lophioneuridae Tillyard, 1921 | | 3 | Species | Taxom |
| Lophopidae Stål, 1866 | | 3 | Species | Taxom |
| Lucanidae Latreille, 1804 | Stag Beetle | 18 | Species | Taxom |
| Lycaenidae Leach, 1815 | Blue butterflies | 2 | Species | Taxom |
| Lycidae Laporte, 1836 | Lycid beetles | 6 | Species | Taxom |
| Lygaeidae Schilling, 1829 | Chinch bugs | 67 | Species | Taxom |
| Lygistorrhinidae Hendel, 1936 | Long beaked fungus gnat | 1 | Species | Taxom |
| Lymexylidae Fleming, 1821 | Ship-timber beetle | 3 | Species | Taxom |
| Lyonetiidae Stainton, 1854 | Lyonet Moths | 2 | Species | Taxom |
| Macroveliidae McKinstry, 1942 | Macroveliid shore bugs | 1 | Species | Taxom |
| Mantidae Burmeister, 1838 | Mantids | 7 | Species | Taxom |
| Mantispidae Leach, 1815 | Mantid lacewings | 7 | Species | Taxom |
| Mantoididae Giglio-Tos, 1927 | | 1 | Species | Taxom |
| Mantophasmatidae Zompro, Kla..., 2002 | Gladiators | 2 | Species | Taxom |
| Margarodidae Newstead, 1901 | Cottony cushion scales | 1 | Species | Taxom |
| Mastotermitidae Desneux, 1904 | | 23 | Species | Taxom |
| Matsucoccidae Morrison, 1927 | Pine bark scales | 6 | Species | Taxom |
| Megachilidae Schenk, 1860 | And Resin Bees | 37 | Species | Taxom |
| Megalyridae Schletterer, 1889 | Megalyrid wasps | 12 | Species | Taxom |
| Meganeuridae Handlirsch, 1906 | | 3 | Species | Taxom |
| Megapodagrionidae Tillyard, 1917 | Flatwing | 18 | Species | Taxom |
| Megarididae McAtee & Mal..., 1928 | | 1 | Species | Taxom |
| Megaspilidae Ashmead, 1893 | Megaspilid wasps | 7 | Species | Taxom |
| Melandryidae Leach, 1815 | False Darkling Beetle | 14 | Species | Taxom |
| Melanthripidae Bagnall, 1913 | | 2 | Species | Taxom |
| Melittidae Schenk, 1860 | Melittid bees | 7 | Species | Taxom |
| Meloidae Gyllenhal, 1810 | Blister Beetle | 15 | Species | Taxom |
| Melyridae Leach, 1815 | Malachite Beetles | 17 | Species | Taxom |
| Membracidae Germar, 1821 | Horned Treehoppers | 2 | Species | Taxom |
| Mengeidae Pierce, 1908 | | 2 | Species | Taxom |
| Menoponidae Mjöberg, 1910 | Bird lice | 1 | Species | Taxom |
| Merothripidae Hood, 1914 | Large-legged thrips | 1 | Species | Taxom |
| Mesephemeridae Lameere, 1917 | | 3 | Species | Taxom |
| Mesoblattinidae Handlirsch, 1906 | | 8 | Species | Taxom |
| Mesochrysopidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Mesocinetidae Kirejtshuk &..., 2010 | | 4 | Species | Taxom |
| Mesokristenseniidae Huang, Nel &..., 2010 | | 1 | Species | Taxom |
| Mesopsychidae Tillyard, 1917 | | 1 | Species | Taxom |
| Mesoraphidiidae Martynov, 1925 | | 3 | Species | Taxom |
| Mesoserphidae Kozlov, 1970 | | 1 | Species | Taxom |
| Mesoveliidae Douglas and ..., 1867 | Pond treaders | 2 | Species | Taxom |
| Mesuropetalidae Bechly, 1996 | | 1 | Species | Taxom |
| Micromalthidae Barber, 1913 | Micromalthid beetles | 3 | Species | Taxom |
| Micropezidae Illiger, 1798 | Stilt Flies | 3 | Species | Taxom |
| Microphysidae Dohrn, 1859 | Microphysid bugs | 11 | Species | Taxom |
| Micropterigidae Herrich-Schä..., 1855 | Mandibulate Archaic Moths | 6 | Species | Taxom |
| Milichiidae Schiner, 1862 | Filth flies | 10 | Species | Taxom |
| Miridae Hahn, 1831 | Capsid bugs | 80 | Species | Taxom |
| Mogoplistidae Saussure, 1877 | Scaly cricket | 7 | Species | Taxom |
| Molannidae Wallengren, 1891 | Hood Casemaker Caddisflies | 2 | Species | Taxom |
| Monophlebidae Signoret, 1875 | Giant scale | 4 | Species | Taxom |
| Monotomidae Laporte, 1840 | Minute Clubbed Beetles | 3 | Species | Taxom |
| Mordellidae Latreille, 1802 | Pintail beetles | 28 | Species | Taxom |
| Moundthripidae Nel & al., 2007 | | 1 | Species | Taxom |
| Muchoriidae Willmann, 1989 | | 1 | Species | Taxom |
| Muscidae Latreille, 1802 | Face flies | 10 | Species | Taxom |
| Mutillidae André, 1907 | Cow ant | 5 | Species | Taxom |
| Mycetophagidae Leach, 1815 | Hairy fungus beetle | 4 | Species | Taxom |
| Mycetophilidae Newman, 1834 | Fungus Gnat | 425 | Species | Taxom |
| Mycteridae Blanchard, 1845 | Mycterid beetles | 4 | Species | Taxom |
| Mydidae Bezzi, 1903 | Mydas flies | 1 | Species | Taxom |
| Myerslopiidae Evans, 1957 | | 1 | Species | Taxom |
| Mymaridae Haliday, 1833 | Fairflies | 23 | Species | Taxom |
| Mymarommatidae Debauche, 1948 | False fairy wasp | 2 | Species | Taxom |
| Myopsocidae Enderlein, 1907 | Mouse like barklouse | 1 | Species | Taxom |
| Myrmecolacidae Saunders, 1872 | | 15 | Species | Taxom |
| Myrmeleontidae Latreille, 1802 | Ant lions | 3 | Species | Taxom |
| Myrmosidae Fox, 1894 | Myrmosid Wasps | 8 | Species | Taxom |
| Mythicomyiidae Melander, 1902 | Micro Bee Flies | 7 | Species | Taxom |
| Nabidae Costa, 1852 | Damsel bugs | 6 | Species | Taxom |
| Naibiidae Shcherbakov, 2007 | | 2 | Species | Taxom |
| Nannochoristidae Tillyard, 1917 | | 3 | Species | Taxom |
| Naucoridae Leach, 1815 | Creeping water bug | 10 | Species | Taxom |
| Necrotauliidae Handlirsch, 1906 | | 7 | Species | Taxom |
| Nemestrinidae Macquart, 1834 | Tangle-veined flies | 6 | Species | Taxom |
| Nemonychidae Bedel, 1882 | Nemonychid weevils | 57 | Species | Taxom |
| Nemopteridae Rambur, 1842 | Spoonwings | 2 | Species | Taxom |
| Nemouridae Newman, 1853 | Brown stoneflies | 6 | Species | Taxom |
| Neoephemeridae Traver, 1935 | Large square-gilled mayflies | 2 | Species | Taxom |
| Nepidae Latreille, 1802 | Back-swimmer Water-boatmen | 6 | Species | Taxom |
| Nepticulidae Stainton, 1854 | Leaf miners | 6 | Species | Taxom |
| Neurochaetidae Mcalpine, 1978 | Upside-Down Flies | 2 | Species | Taxom |
| Nevrorthidae Nakahara, 1958 | | 6 | Species | Taxom |
| Nitidulidae Latreille, 1802 | Nitidules | 55 | Species | Taxom |
| Nocticolidae Bolivar, 1892 | Australian cockroaches | 1 | Species | Taxom |
| Noctuidae Latreille, 1809 | Armyworms | 20 | Species | Taxom |
| Nogodinidae Melichar, 1898 | | 15 | Species | Taxom |
| Nosodendridae Erichson, 1846 | Nosodendrid beetles | 4 | Species | Taxom |
| Noteridae C. G. Thomson, 1860 | Burrowing water beetle | 1 | Species | Taxom |
| Notodontidae Stephens, 1829 | Bag Shelter Moths | 2 | Species | Taxom |
| Notonectidae Latreille, 1802 | Back Swimmers | 14 | Species | Taxom |
| Nymphalidae Rafinesque, 1815 | Admirals | 32 | Species | Taxom |
| Nymphidae Rambur, 1842 | Split-footed lacewing | 6 | Species | Taxom |
| Nymphomyiidae Tokunaga, 1932 | Nymphomyiid crane flies | 1 | Species | Taxom |
| Obrieniidae Zherikhin an..., 1994 | | 1 | Species | Taxom |
| Ochodaeidae Mulsant & Rey, 1870 | Sand-loving scarab beetle | 1 | Species | Taxom |
| Odiniidae Hendel, 1920 | Odiniid flies | 1 | Species | Taxom |
| Odontoceridae Wallengren, 1891 | Mortarjoint Casemaker Caddisflies | 7 | Species | Taxom |
| Oecophoridae Bruand, 1851 | Concealer Moths | 14 | Species | Taxom |
| Oedemeridae Latreille, 1810 | False Blister Beetle | 5 | Species | Taxom |
| Oestridae Leach, 1815 | Bot flies | 6 | Species | Taxom |
| Oligoneuriidae Ulmer, 1914 | Brushleg Mayflies | 7 | Species | Taxom |
| Omalisidae Lacordaire, 1857 | | 1 | Species | Taxom |
| Omethidae LeConte, 1861 | False fireflies | 1 | Species | Taxom |
| Ommatidae Sharp & Muir, 1912 | | 23 | Species | Taxom |
| Opetiidae Rondani, 1856 | Flat-footed flies | 1 | Species | Taxom |
| Opomyzidae (Fallen, 1820) | Opomyzid flies | 2 | Species | Taxom |
| Ortheziidae Green, 1896 | Ensign coccids | 8 | Species | Taxom |
| Orthophlebiidae Handlirsch, 1906 | | 13 | Species | Taxom |
| Orussidae Newman, 1834 | Orussid wasps | 3 | Species | Taxom |
| Osmylidae Leach, 1815 | Giant lacewings | 8 | Species | Taxom |
| Otitidae (Macquart, 1835) | Picture-winged flies | 4 | Species | Taxom |
| Pachymeridiidae Handlirsch, 1906 | | 3 | Species | Taxom |
| Pachyneuridae Schiner, 1864 | Dark-winged fungus gnats | 1 | Species | Taxom |
| Pachytroctidae Enderlein, 1911 | Thick Barklice | 1 | Species | Taxom |
| Palaeomacromiidae Petruleviciu..., 1999 | | 4 | Species | Taxom |
| Palaeontinidae Handlirsch, 1906 | Giant cicadas | 3 | Species | Taxom |
| Paleomelittidae Engel, 2001 | | 1 | Species | Taxom |
| Pallopteridae Loew, 1862 | Flutter flies | 7 | Species | Taxom |
| Pamphiliidae Cameron, 1890 | Leaf-rolling sawflies | 6 | Species | Taxom |
| Panorpidae Linnaeus, 1758 | Common scorpionflies | 11 | Species | Taxom |
| Panorpodidae Byers, 1965 | Short-faced scorpionflies | 5 | Species | Taxom |
| Papilionidae Latreille, 1802 | Apollos | 7 | Species | Taxom |
| Paragonophlebiidae Nel, 2009 | | 1 | Species | Taxom |
| Parahygrobiidae Ponomarenko, 1977 | Extinct family | 1 | Species | Taxom |
| Parandrexidae Kirejtshuk, 1994 | | 1 | Species | Taxom |
| Parasialidae Ponomarenko, 1977 | | 1 | Species | Taxom |
| Parastenophlebiidae Bechly, 2005 | | 1 | Species | Taxom |
| Paraxymyiidae Rohdendorf, 1946 | Paxylommatid wasps | 3 | Species | Taxom |
| Passalidae Leach, 1815 | Bess beetle | 2 | Species | Taxom |
| Pediciidae Osten Sacken, 1860 | Hairy-Eyed Crane Flies | 3 | Species | Taxom |
| Pelecinidae Haliday, 1839 | Ancestral And Modern Pelecinid Wasps | 3 | Species | Taxom |
| Pentatomidae Leach, 1815 | Lesser shield bugs | 77 | Species | Taxom |
| Peradeniidae Naumann & Ma..., 1985 | | 1 | Species | Taxom |
| Pereboriidae Zalessky, 1930 | | 1 | Species | Taxom |
| Pergidae Rohwer, 1911 | Pergid flies | 1 | Species | Taxom |
| Perilampidae Latreille, 1809 | Perilampid waps | 2 | Species | Taxom |
| Perilestidae Tillyard & F..., 1938 | Shortwings | 2 | Species | Taxom |
| Periscelididae Oldenberg, 1914 | Periscelidid Flies | 9 | Species | Taxom |
| Perissommatidae Colless, 1962 | | 2 | Species | Taxom |
| Perlariopseidae N.D. Siniche..., 1985 | | 13 | Species | Taxom |
| Perlidae (Latreille, 1802) | Common stoneflies | 14 | Species | Taxom |
| Perlodidae Klapálek, 1912 | Perlodid stoneflies | 4 | Species | Taxom |
| Permelcanidae Sharov, 1962 | | 3 | Species | Taxom |
| Petaluridae Needham, 1903 | Grayback dragonfly | 2 | Species | Taxom |
| Phaeomyiidae (Verbeke, 1950) | Marsh flies | 1 | Species | Taxom |
| Phalacridae Leach, 1815 | Shining flower beetles | 6 | Species | Taxom |
| Phalangopsidae (Chopard, 1949) | Spider cricket | 5 | Species | Taxom |
| Phasmomimidae Sharov, 1968 | | 2 | Species | Taxom |
| Philopotamidae Stephens, 1829 | Finger Net caddisflies | 26 | Species | Taxom |
| Philotarsidae Pearman, 1936 | Loving Barklice | 2 | Species | Taxom |
| Phlaeothripidae Uzel, 1895 | Thrips | 20 | Species | Taxom |
| Phoberoblattidae Durden, 1969 | | 1 | Species | Taxom |
| Phoridae Curtis, 1833 | Coffin Flies | 62 | Species | Taxom |
| Phryganeidae (Leach, 1815) | Giant casemaker | 31 | Species | Taxom |
| Phylliidae Redtenbacher, 1906 | Leaf insects | 1 | Species | Taxom |
| Phyllodromiidae (Brunner von ..., 1865) | | 1 | Species | Taxom |
| Phylloxeridae Herrich-Scha..., 1854 | Phylloxeran Aphids | 2 | Species | Taxom |
| Pieridae Duponchel, 1835 | Brimstones | 5 | Species | Taxom |
| Piesmatidae Amyot & Audi..., 1843 | Ash grey leaf bug | 3 | Species | Taxom |
| Piophilidae Macquart, 1835 | Cheese flies | 1 | Species | Taxom |
| Pipunculidae Walker, 1834 | Big headed flies | 11 | Species | Taxom |
| Pityococcidae Mckenzie, 1942 | | 2 | Species | Taxom |
| Plataspididae (Dallas, 1851) | | 1 | Species | Taxom |
| Platycnemididae Tillyard, 1917 | White-legged damselflies | 2 | Species | Taxom |
| Platygastridae Haliday, 1833 | Platygastrid wasps | 6 | Species | Taxom |
| Platyperlidae Sinitshenkova, 1982 | | 3 | Species | Taxom |
| Platypezidae Fallen, 1815 | Flat footed flies | 6 | Species | Taxom |
| Pleciofungivoridae Rohdendorf, 1946 | | 31 | Species | Taxom |
| Pleciomimidae Rodendorf, 1949 | | 6 | 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 | 4 | Species | Taxom |
| Podoscirtidae Saussure, 1878 | | 7 | Species | Taxom |
| Polycentropodidae Ulmer, 1903 | Tube Maker Caddisflies | 83 | Species | Taxom |
| Polystoechotidae Handlirsch, 1906 | Giant lacewing | 6 | Species | Taxom |
| Pompilidae Latreille, 1805 | Pompilid wasps | 20 | Species | Taxom |
| Praeaulacidae Rasnitsyn, 1972 | | 4 | Species | Taxom |
| Prionoceridae Lacaordaire, 1857 | | 1 | Species | Taxom |
| Priscalestidae Wappler & Pe..., 2007 | | 1 | Species | Taxom |
| Procercopidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Prochresmodidae Vishniakova, 1980 | | 1 | Species | Taxom |
| Procramptonomyiidae Kovalev, 1985 | | 4 | Species | Taxom |
| Proctotrupidae Latreille, 1802 | Proctotrupid wasps | 12 | Species | Taxom |
| Progonocimicidae Handlirsch, 1906 | | 4 | Species | Taxom |
| Prohemerobiidae Handlirsch, 1906 | | 1 | Species | Taxom |
| Prohemeroscopidae Bechly & Ueda, 2002 | | 2 | Species | Taxom |
| Promastacidae Kevan & Wighton, 1981 | | 2 | Species | Taxom |
| Proneottiophilidae Hennig, 1969 | | 1 | Species | Taxom |
| Prophalangopsidae Saussure, 1878 | Grigs | 13 | Species | Taxom |
| Prostenophlebiidae Fleck & al., 2003 | | 1 | Species | Taxom |
| Proterhinidae (Fauvel, 1891) | | 2 | Species | Taxom |
| Proterogomphidae Bechly, 1996 | | 1 | Species | Taxom |
| Protocoridae Handlirsch, 1906 | | 1 | Species | Taxom |
| Protodiplatyidae Martynov, 1925 | | 6 | Species | Taxom |
| Protogryllidae Zeuner, 1937 | | 2 | Species | Taxom |
| Protoligoneuridae Rohdendorf, 1962 | | 0 | Species | Taxom |
| Protomyrmeleontidae Handlirsch, 1906 | | 7 | Species | Taxom |
| Protoneuridae Tillyard, 1917 | Bambootails | 1 | Species | Taxom |
| Protopleciidae Rohdendorf, 1946 | | 5 | Species | Taxom |
| Protopsyllidiidae Becker-Migdi..., 1960 | | 4 | Species | Taxom |
| Protorhyphidae Handlirsch, 1906 | | 3 | Species | Taxom |
| Protoxenidae Pohl, Beutel..., 2005 | | 1 | Species | Taxom |
| Psephenidae Lacordaire, 1854 | Water pennies | 3 | Species | Taxom |
| Pseudocaeciliidae Pearman, 1936 | False Lizard Barklice | 2 | Species | Taxom |
| Pseudococcidae Heymons, 1915 | Mealy Bugs | 3 | Species | Taxom |
| Pseudomylacridae Handlirsch, 1906 | | 1 | Species | Taxom |
| Pseudophasmatidae Kirby, 1896 | Striped Walkingsticks | 1 | Species | Taxom |
| Pseudophyllodromiidae Hebard, 1929 | | 9 | Species | Taxom |
| Pseudopolycentropodidae Handlirsch, 1925 | | 1 | Species | Taxom |
| Pseudopomyzidae (Mcalpine, 1966) | Banana flies | 2 | Species | Taxom |
| Pseudopulicidae Gao, Shih & Ren, 2012 | | 0 | Species | Taxom |
| Pseudostenolestidae Garrouste & Nel, 2015 | | 1 | Species | Taxom |
| Psilidae Macquart, 1835 | Carrot flies | 2 | Species | Taxom |
| Psocidae Samouelle, 1819 | Common bark louse | 4 | Species | Taxom |
| Psoquillidae Lienhard & S..., 2002 | Bird Nest Barklice | 1 | Species | Taxom |
| Psychidae Boisduval, 1828 | Bagmoths | 4 | Species | Taxom |
| Psychodidae Newman, 1834 | Drain flies | 68 | Species | Taxom |
| Psychomyiidae Walker, 1852 | Net Tube Caddisflies | 9 | Species | Taxom |
| Psychopsidae Handlirsch, 1906 | Silky lacewing | 17 | Species | Taxom |
| Psyllidae Latreille, 1807 | Jumping plant lice | 46 | Species | Taxom |
| Psyllipsocidae Enderlein, 1903 | Cave Barklice | 2 | Species | Taxom |
| Pterocimicidae Popov & al., 1994 | | 1 | Species | Taxom |
| Pteromalidae Dalman, 1820 | Pteromalid wasps | 30 | Species | Taxom |
| Pterophoridae Zeller, 1841 | Plume Moths | 1 | Species | Taxom |
| Pteroplistidae (Chopard, 1936) | | 1 | Species | Taxom |
| Ptiliidae Heer, 1843 | Feather-wing beetles | 8 | Species | Taxom |
| Ptilodactylidae Laporte, 1836 | Ptilodactylid beetles | 2 | Species | Taxom |
| Ptiloneuridae Eertmoed, 1973 | | 1 | Species | Taxom |
| Ptinidae Latreille, 1802 | Death-watch and Spider Beetles | 53 | Species | Taxom |
| Ptychopteridae Osten Sacken, 1862 | Phantom crane flies | 26 | Species | Taxom |
| Pulicidae Billberg, 1820 | Cat fleas | 3 | Species | Taxom |
| Putoidae Beardsley, 1969 | Giant mealybugs | 1 | Species | Taxom |
| Pygidicranidae (Verhoeff, 1902) | | 3 | Species | Taxom |
| Pyralidae Latreille, 1802 | Flour Moths | 7 | Species | Taxom |
| Pyrgomorphidae Brunner von ..., 1874 | Bushlocusts | 2 | Species | Taxom |
| Pyrochroidae Latreille, 1807 | Cardinal beetles | 2 | Species | Taxom |
| Pyrrhocoridae Dohrn, 1859 | Cotton stainers | 3 | Species | Taxom |
| Pythidae Solier, 1834 | Dead log bark beetles | 1 | Species | Taxom |
| Rangomaramidae Jaschhof & D..., 2002 | | 3 | Species | Taxom |
| Raphidiidae Latreille, 1810 | Raphidiid snakeflies | 12 | Species | Taxom |
| Raphidiomimidae Vishniakova, 1973 | | 0 | Species | Taxom |
| Reduviidae Latreille, 1807 | Assassin and thread-legged bugs | 46 | Species | Taxom |
| Rhachiberothidae Tjeder, 1959 | Thorny lacewing | 3 | Species | Taxom |
| Rhagionempididae Rohdendorf, 1938 | | 2 | Species | Taxom |
| Rhagionidae Latreille, 1802 | Snipe flies | 36 | Species | Taxom |
| Rhaphidophoridae Walker, 1869 | And Cave Weta | 4 | Species | Taxom |
| Rhinotermitidae Froggatt, 1897 | Subterranean termites | 27 | Species | Taxom |
| Rhipiphoridae Gemminger & ..., 1870 | Hump back beetles | 5 | Species | Taxom |
| Rhopalidae Amyot & Serv..., 1843 | Rhopalid Bugs | 7 | Species | Taxom |
| Rhopalosomatidae Ashmead, 1896 | Rhopalosomatid wasps | 2 | Species | Taxom |
| Rhyacophilidae Stephens, 1836 | Free-living Caddisflies | 1 | Species | Taxom |
| Rhynchitidae Gistel, 1848 | Leaf-rolling weevils | 3 | Species | Taxom |
| Rhyparochromidae Amyot & Serv..., 1843 | Dirt-colored Seed Bugs | 20 | Species | Taxom |
| Ricaniidae Amyot & Audi..., 1843 | | 12 | Species | Taxom |
| Richardiidae (Snow, 1896) | Picture-winged flies | 3 | Species | Taxom |
| Riodinidae Grote, 1895 | Metalmark Butterflies | 2 | Species | Taxom |
| Ripiphoridae Gemminger & ..., 1870 | Rhipiphoridae | 3 | Species | Taxom |
| Ripipterygidae Ander, 1939 | Mud crickets | 1 | Species | Taxom |
| Romaleidae Brunner von ..., 1893 | Lubber grasshopper | 1 | Species | Taxom |
| Roproniidae Bradley, 1905 | Roproniid wasps | 1 | Species | Taxom |
| Saldidae Amyot and Se..., 1843 | Shore bug | 12 | Species | Taxom |
| Salpingidae Leach, 1815 | Narrow-waisted bark beetle | 3 | Species | Taxom |
| Saturniidae Boisduval, 1837 | And Giant Silk Moths | 1 | Species | Taxom |
| Scarabaeidae Latreille, 1802 | Dung beetles | 199 | Species | Taxom |
| Scathophagidae Robineau-Des..., 1830 | Dung flies | 3 | Species | Taxom |
| Scatopsidae Newman, 1834 | Dung midges | 17 | Species | Taxom |
| Scelembiidae Ross, 2001 | | 1 | Species | Taxom |
| Scelionidae Haliday, 1839 | Scelionid wasps | 48 | Species | Taxom |
| Scenopinidae Burmeister, 1835 | Window Flies | 2 | Species | Taxom |
| Schizoblattidae Durden, 1969 | | 0 | Species | Taxom |
| Schizophoridae Ponomarenko, 1968 | | 6 | Species | Taxom |
| Schizopodidae (LeConte, 1859) | False Jewel Beetles | 1 | Species | Taxom |
| Schizopteridae Reuter, 1891 | Jumping ground bugs | 3 | Species | Taxom |
| Sciaridae Billberg, 1820 | Black fungus gnats | 8 | Species | Taxom |
| Sciomyzidae Fallen, 1820 | Marsh Flies | 14 | Species | Taxom |
| Scirtidae Fleming, 1821 | Marsh Beetle | 32 | Species | Taxom |
| Scolebythidae Evans, 1963 | Scolebythid wasps | 13 | Species | Taxom |
| Scoliidae Leach, 1815 | Mammoth wasps | 5 | Species | Taxom |
| Scraptiidae Mulsant, 1856 | Antlike leaf beetles | 11 | Species | Taxom |
| Scutelleridae Leach, 1815 | Jewel bugs | 8 | Species | Taxom |
| Scydmaenidae (Leach, 1815) | Ant-like stone beetles | 29 | Species | Taxom |
| Sepsidae Walker, 1833 | Black scavenger flies | 5 | Species | Taxom |
| Septiventeridae Bai & al., 2013 | | 1 | Species | Taxom |
| Sepulcidae Rasnitsyn, 1968 | | 2 | Species | Taxom |
| Serafinidae Koteja, 2008 | | 1 | Species | Taxom |
| Sericostomatidae Stephens, 1836 | Bushtailed Caddisflies | 6 | Species | Taxom |
| Serpentivenidae Shcherbakov, 1984 | | 1 | Species | Taxom |
| Sharephemeridae Sinitshenkova, 2002 | | 1 | Species | Taxom |
| Sialidae Leach, 1815 | Alderflies | 11 | Species | Taxom |
| Siberioperlidae Sinitshenkova, 1983 | | 8 | Species | Taxom |
| Sibiriothaumatidae Sukatcheva &..., 1998 | | 1 | Species | Taxom |
| Sieblosiidae Handlirsch, 1906 | | 21 | Species | Taxom |
| Silphidae Latreille, 1807 | Burying And Carrion Beetles | 32 | Species | Taxom |
| Silvanidae Kirby, 1837 | Flat bark beetles | 3 | Species | Taxom |
| Simuliidae Newman, 1834 | Black flies | 14 | Species | Taxom |
| Sinisilvanidae (Hong, 2002) | | 1 | Species | Taxom |
| Siphlonuridae Banks, 1900 | Primitive Minnow Mayflies | 24 | Species | Taxom |
| Siricidae Billberg, 1820 | Horntail | 6 | Species | Taxom |
| Sisyridae Handlirsch, 1908 | Spongeflies | 5 | Species | Taxom |
| Smicripidae Horn, 1879 | Palmetto beetle | 2 | Species | Taxom |
| Solenoptilidae Handlirsch, 1906 | | 2 | Species | Taxom |
| Sphaeroceridae Macquart, 1835 | Dung flies | 3 | Species | Taxom |
| Sphaeropsocidae Kolbe, 1883 | | 1 | Species | Taxom |
| Sphecidae Latreille, 1802 | Digger & Sand wasps | 14 | Species | Taxom |
| Sphindidae Jacquelin du..., 1860 | Cryptic slime mold beetle | 1 | Species | Taxom |
| Sphingidae Latreille, 1802 | Hawk Moths | 2 | Species | Taxom |
| Staphylinidae Lameere, 1900 | Rove beetles | 388 | Species | Taxom |
| Steleopteridae Handlirsch, 1906 | | 4 | Species | Taxom |
| Stenopelmatidae Burmeister, 1838 | Bulldog Raspy Crickets | 4 | Species | Taxom |
| Stenophlebiidae Needham, 1903 | | 5 | Species | Taxom |
| Stenopsychidae Martynov, 1924 | | 1 | Species | Taxom |
| Stephanidae Leach, 1815 | Crown wasp | 7 | Species | Taxom |
| Strashilidae Rasnitsyn, 1992 | | 1 | Species | Taxom |
| Stratiomyidae Latreille, 1802 | Soldier flies | 21 | Species | Taxom |
| Streblidae (Kolenati, 1863) | Bat flies | 1 | Species | Taxom |
| Stylopidae Kirby, 1813 | Strepsiptera | 1 | Species | Taxom |
| Synteliidae Lewis, 1882 | | 1 | Species | Taxom |
| Syrphidae Latreille, 1802 | Drone flies | 88 | Species | Taxom |
| Tabanidae Latreille, 1802 | Breeze flies | 22 | Species | Taxom |
| Tachinidae (Robineau-Des..., 1830) | Bristle Flies | 3 | Species | Taxom |
| Taeniopterygidae Klapálek, 1905 | Taeniopterygid winter stoneflies | 7 | 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 |
| Tarsophlebiidae Handlirsch, 1906 | | 4 | Species | Taxom |
| Tchirkovaeidae Sinichenkova, 1979 | | 2 | Species | Taxom |
| Tenebrionidae Latreille, 1802 | Darkling Beetle | 120 | Species | Taxom |
| Tenthredinidae Latreille, 1804 | Common sawflies | 64 | Species | Taxom |
| Tephritidae Newman, 1834 | Fruit flies | 8 | Species | Taxom |
| Teratembiidae Krauss, 1911 | | 1 | Species | Taxom |
| Termitaphididae Myers, 1924 | Termite bug | 4 | Species | Taxom |
| Termitidae Latreille, 1802 | Higher termites | 54 | Species | Taxom |
| Termopsidae Grassé, 1949 | Damp wood termite | 12 | Species | Taxom |
| Tessaratomidae Stål, 1864 | Giant shield bug | 2 | Species | Taxom |
| Tetracampidae Förster, 1856 | Tetracampid wasps | 2 | Species | Taxom |
| Tetratomidae Billberg, 1820 | Polypore fungus beetle | 2 | Species | Taxom |
| Tetrigidae Rambur, 1838 | Groundhoppers | 7 | Species | Taxom |
| Tettigarctidae Distant, 1905 | Hairy cicada | 4 | Species | Taxom |
| Tettigometridae Germar, 1821 | | 1 | Species | Taxom |
| Tettigoniidae Krauss, 1902 | Bush crickets | 39 | Species | Taxom |
| Thaumaleidae Bezzi, 1913 | Solitary midges | 1 | Species | Taxom |
| Thaumastocoridae Kirkaldy, 1908 | Palm bug | 5 | Species | Taxom |
| Thaumatoneuridae Fraser, 1957 | | 14 | Species | Taxom |
| Therevidae Newman, 1834 | Stiletto flies | 9 | Species | Taxom |
| Thripidae Stevens, 1829 | Common thrips | 81 | Species | Taxom |
| Throscidae Laporte, 1840 | False metallic wood-boring beetles | 15 | Species | Taxom |
| Thynnidae Shuckard, 1841 | Thynnid Wasps | 1 | Species | Taxom |
| Tibicinidae (Distant, 1905) | | 1 | Species | Taxom |
| Tineidae Latreille, 1810 | & Allies | 21 | Species | Taxom |
| Tingidae Laporte, 1832 | Lace bug | 42 | Species | Taxom |
| Tiphiidae Leach, 1815 | Flower wasps | 16 | Species | Taxom |
| Tipulidae Latreille, 1802 | Crane Flies | 378 | Species | Taxom |
| Torephemeridae Sinitshekova, 1989 | | 2 | Species | Taxom |
| Tortricidae Latreille, 1803 | Bell Moths | 9 | Species | Taxom |
| Torymidae Walker, 1833 | Apple seed chalcids | 15 | Species | Taxom |
| Trachypachidae C. G. Thomson, 1857 | False ground beetle | 23 | Species | Taxom |
| Trichoceridae Rondani, 1841 | Winter Crane Flies | 49 | Species | Taxom |
| Trichogrammatidae Haliday, 1851 | Trichogrammatid wasps | 5 | Species | Taxom |
| Trichopsocidae Pearman, 1936 | Lash-faced psocid | 2 | Species | Taxom |
| Tricoleidae (Ponomarenko, 1969) | | 1 | Species | Taxom |
| Tridactylidae Saussure, 1874 | Pygmy mole cricket | 3 | Species | Taxom |
| Trigonalidae (Cresson, 1887) | Trigonalid sawflies | 1 | Species | Taxom |
| Trigonalyidae | | 1 | Species | Taxom |
| Trigonidiidae (Saussure, 1870) | And Ground Crickets | 13 | Species | Taxom |
| Triozidae Löw, 1879 | Jumping plant lice | 3 | Species | Taxom |
| Trisegmentatidae Zhang, Sun &..., 1994 | | 1 | Species | Taxom |
| Tritarsidae Hong, 2002 | | 1 | Species | Taxom |
| Troctopsocidae Mockford, 1967 | | 1 | Species | Taxom |
| Trogidae (MacLeay, 1819) | Gnawer beetles | 2 | Species | Taxom |
| Trogossitidae Latreille, 1802 | Bark gnawing beetle | 27 | Species | Taxom |
| Tropiduchidae Stål, 1866 | Tropiduchid Planthoppers | 7 | Species | Taxom |
| Tshekardocoleidae Rohdendorf, 1944 | | 3 | Species | Taxom |
| Tuphellidae Gorochov, 1988 | | 1 | Species | Taxom |
| Undopterigidae (Kozlov, 1988) | | 1 | Species | Taxom |
| Urolibellulidae Zeiri & al., 2015 | | 1 | Species | Taxom |
| Urostylidae (Dallas, 1851) | | 6 | Species | Taxom |
| Urothemistidae Lieftinck, 1954 | | 1 | Species | Taxom |
| Valeseguyidae Amorim & Gri..., 2006 | | 1 | Species | Taxom |
| Veliidae Amyot & Serv..., 1843 | Broad-shouldered bugs | 9 | Species | Taxom |
| Vesperidae Mulsant, 1839 | Vesperid longicorn beetles | 1 | Species | Taxom |
| Vespidae Leach, 1815 | And Allies | 46 | Species | Taxom |
| Vitimotauliidae Sukatsheva, 1968 | | 2 | Species | Taxom |
| Weitschatidae Koteja, 2008 | | 2 | Species | Taxom |
| Weiwoboidae Lin, Szwedo,..., 2010 | | 1 | Species | Taxom |
| Xiphocentronidae Schmid, 1982 | | 1 | Species | Taxom |
| Xyelidae Newman, 1835 | Sawfly | 18 | Species | Taxom |
| Xyelotomidae Rasnitsyn, 1968 | | 1 | Species | Taxom |
| Xyelydidae Rasnitsyn, 1968 | | 1 | Species | Taxom |
| Xylococcidae (Pergrande, 1898) | | 2 | Species | Taxom |
| Xylomyidae Verrall, 1901 | Wood soldier flies | 2 | Species | Taxom |
| Xylophagidae Fallen, 1810 | Awl-flies | 7 | Species | Taxom |
| Yantarocentridae Ivanov & Mel..., 2015 | | 1 | Species | Taxom |
| Yponomeutidae Stephens, 1829 | Ermine Moths | 6 | Species | Taxom |
| Zacallitidae Cockerell, 1928 | Extinct family of damselflies | 1 | Species | Taxom |
| Zopheridae Solier, 1834 | Cylindrical bark beetles | 15 | Species | Taxom |
| Zorotypidae Silvestri, 1913 | Angel insects | 4 | Species | Taxom |
| Zygaenidae Latreille, 1809 | Burnet Forester | 4 | Species | Taxom |
