| Acaridae Latreille, 1802 | Acarid mites | 4 | Species | Taxom |
| Aeroglyphidae Zakhvatkin, 1941 | | 2 | Species | Taxom |
| Agelenidae C. L. Koch, 1837 | Agelenid Spiders | 1 | Species | Taxom |
| Alloptidae Gaud, 1957 | | 1 | Species | Taxom |
| Amaurobiidae Thorell, 1870 | Amaurobiids | 1 | Species | Taxom |
| Amblyommidae Banks, 1907 | | 18 | Species | Taxom |
| Ameroseiidae Evans, 1961 | | 3 | Species | Taxom |
| Analgidae Trouessart &..., 1884 | Feather mites | 0 | Species | Taxom |
| Anapidae Simon, 1895 | Anapid spiders | 2 | Species | Taxom |
| Anisitsiellidae Koenike, 1910 | | 1 | Species | Taxom |
| Araneidae Simon, 1895 | Golden orb web spiders | 67 | Species | Taxom |
| Arceremaeidae Balogh, 1972 | | 1 | Species | Taxom |
| Argasidae C. L. Koch, 1844 | Soft tick | 6 | Species | Taxom |
| Arrenuridae Thor, 1900 | | 4 | Species | Taxom |
| Ascidae Oudemans, 1905 | | 0 | Species | Taxom |
| Assamiidae Sørensen, 1884 | | 13 | Species | Taxom |
| Astegistidae Balogh, 1961 | | 1 | Species | Taxom |
| Atemnidae Chamberlin, 1931 | | 10 | Species | Taxom |
| Atopomelidae Fain, 1972 | | 16 | Species | Taxom |
| Aturidae Thor, 1900 | | 5 | Species | Taxom |
| Autognetidae Grandjean, 1960 | | 1 | Species | Taxom |
| Barychelidae Simon, 1889 | Brush-footed trapdoors | 5 | Species | Taxom |
| Biantidae Thorell, 1889 | | 1 | Species | Taxom |
| Blattisociidae (Garman, 1948) | | 0 | Species | Taxom |
| Buthidae C. L. Koch, 1837 | Arrowbreasted scorpions | 13 | Species | Taxom |
| Carabodidae Koch, 1837 | | 11 | Species | Taxom |
| Cepheusidae Berlese, 1896 | | 1 | Species | Taxom |
| Ceratoppiidae (Kunst, 1971) | | 2 | Species | Taxom |
| Chaerilidae Pocock, 1893 | | 14 | Species | Taxom |
| Chaetodactylidae Zakhvatkin, 1941 | | 1 | Species | Taxom |
| Charontidae Simon, 1892 | | 10 | Species | Taxom |
| Cheiridiidae Hansen, 1893 | | 2 | Species | Taxom |
| Cheliferidae Risso, 1826 | | 7 | Species | Taxom |
| Chernetidae Menge, 1855 | | 5 | Species | Taxom |
| Cheyletidae Leach, 1815 | | 28 | Species | Taxom |
| Chirodiscidae Trouessart, 1892 | | 22 | Species | Taxom |
| Chortoglyphidae Berlese, 1897 | | 2 | Species | Taxom |
| Chthoniidae Daday, 1888 | | 5 | Species | Taxom |
| Cithaeronidae Simon, 1893 | Cithaeronid spiders | 1 | Species | Taxom |
| Clubionidae Wagner, 1887 | Clubiones | 21 | Species | Taxom |
| Corinnidae Karsch, 1880 | Ant-like Sac Spiders | 35 | Species | Taxom |
| Crotoniidae Thorell, 1876 | | 1 | Species | Taxom |
| Ctenidae Keyserling, 1877 | Tropical wolf spiders | 33 | Species | Taxom |
| Ctenizidae Thorell, 1887 | Cork-lid trapdoor spider | 1 | Species | Taxom |
| Dampfiellidae Balogh, 1961 | | 3 | Species | Taxom |
| Deinopidae C. L. Koch, 1850 | Net-casters | 3 | Species | Taxom |
| Demodecidae Nicolet, 1855 | Follicle mites | 5 | Species | Taxom |
| Dermanyssidae Kolenati, 1859 | Dermanyssid mites | 0 | Species | Taxom |
| Desidae Pocock, 1895 | Desid spiders | 2 | Species | Taxom |
| Dictynidae O. P-Cambridge, 1871 | Dictynid spiders | 1 | Species | Taxom |
| Diplogyniidae Trägårdh, 1941 | | 1 | Species | Taxom |
| Dipluridae Simon, 1889 | Curtainweb Spiders | 4 | Species | Taxom |
| Dysderidae C. L. Koch, 1837 | Dysderid spiders | 1 | Species | Taxom |
| Entonyssidae Ewing, 1922 | | 1 | Species | Taxom |
| Epedanidae Sørensen, 1886 | | 66 | Species | Taxom |
| Epilohmanniidae Oudemans, 1923 | | 1 | Species | Taxom |
| Epimyodicidae Fain, Lukosc..., 1982 | | 0 | Species | Taxom |
| Eremobelbidae Balogh, 1961 | | 1 | Species | Taxom |
| Ereynetidae Schrank, 1776 | | 0 | Species | Taxom |
| Eriophyidae Nalepa, 1898 | Blister mites | 2 | Species | Taxom |
| Erythraeidae Oudemans, 1902 | | 1 | Species | Taxom |
| Eukoeneniidae Condé, 1965 | | 1 | Species | Taxom |
| Euphthiracaridae Jacot, 1930 | | 5 | Species | Taxom |
| Euscorpiidae Laurie, 1896 | Shorttail scorpions | 3 | Species | Taxom |
| Eustathiidae Oudemans, 1905 | | 2 | Species | Taxom |
| Eviphididae Berlese, 1913 | | 2 | Species | Taxom |
| Fedrizziidae Trägårdh, 1937 | | 2 | Species | Taxom |
| Filistatidae Ausserer, 1867 | Crevice weaver | 2 | Species | Taxom |
| Galeodidae Sundevall, 1833 | | 1 | Species | Taxom |
| Galumnellidae Piffl, 1970 | | 4 | Species | Taxom |
| Galumnidae Jacot, 1925 | | 12 | Species | Taxom |
| Garypidae Simon, 1879 | | 1 | Species | Taxom |
| Gastronyssidae Fain, 1956 | | 0 | Species | Taxom |
| Geogarypidae Chamberlin, 1930 | | 4 | Species | Taxom |
| Glycyphagidae De Geer, 1778 | | 1 | Species | Taxom |
| Gnaphosidae Pocock, 1898 | Flat-bellied ground spiders | 2 | Species | Taxom |
| Gonyleptidae Sundevall, 1833 | | 1 | Species | Taxom |
| Halacaridae Murray, 1877 | Sea mites | 5 | Species | Taxom |
| Haplozetidae Grandjean, 1936 | | 7 | Species | Taxom |
| Harpirhynchidae Dubinin, 1957 | | 2 | Species | Taxom |
| Hermanniidae Sellnick, 1928 | | 3 | Species | Taxom |
| Hersiliidae Thorell, 1870 | Hersiliids | 8 | Species | Taxom |
| Heterocoptidae Fain, 1967 | | 1 | Species | Taxom |
| Heterozerconidae Berlese, 1892 | | 1 | Species | Taxom |
| Hexathelidae Simon, 1892 | Australian funnelweb spiders | 1 | Species | Taxom |
| Hirstionyssidae (Evans & Till, 1966) | | 1 | Species | Taxom |
| Histiostomatidae Berlese, 1897 | | 2 | Species | Taxom |
| Hormuridae Laurie, 1896 | | 4 | Species | Taxom |
| Hubbardiidae Cook, 1899 | Hubbardiid shorttailed whipscorpions | 5 | Species | Taxom |
| Hydryphantidae Piersig, 1896 | | 3 | Species | Taxom |
| Hygrobatidae Koch, 1842 | | 11 | Species | Taxom |
| Hyidae Chamberlin, 1930 | | 1 | Species | Taxom |
| Hypoderidae Murray, 1877 | | 1 | Species | Taxom |
| Hystrichonyssidae Keegan, Yunk..., 1960 | | 1 | Species | Taxom |
| Ideoroncidae Chamberlin, 1930 | | 3 | Species | Taxom |
| Ixodidae C. L. Koch, 1844 | Hard Tick | 20 | Species | Taxom |
| Ixodorhynchidae Ewing, 1923 | | 1 | Species | Taxom |
| Knemidokoptidae (Lavoipierre ..., 1951) | | 0 | Species | Taxom |
| Kytoditidae (Oudemans, 1908) | | 0 | Species | Taxom |
| Laelapidae Berlese, 1892 | | 13 | Species | Taxom |
| Linyphiidae Blackwall, 1859 | Dwarf spiders | 53 | Species | Taxom |
| Liocranidae Simon, 1897 | Liocranid sac spiders | 27 | Species | Taxom |
| Liphistiidae Thorell, 1869 | Primitive burrowing spiders | 21 | Species | Taxom |
| Listrophoridae Mégnin & Tro..., 1884 | | 10 | Species | Taxom |
| Lohmanniidae Berlese, 1916 | | 3 | Species | Taxom |
| Lycosidae Lehtinen & H..., 1979 | Ground Spiders | 19 | Species | Taxom |
| Machadobelbidae Balogh, 1972 | | 3 | Species | Taxom |
| Machuellidae Balogh, 1983 | | 1 | Species | Taxom |
| Macrodinychidae Hirschmann, 1979 | | 2 | Species | Taxom |
| Macronyssidae Oudemans, 1936 | Macronyssid Mites | 2 | Species | Taxom |
| Malaconothridae Berlese, 1916 | | 0 | Species | Taxom |
| Melicharidae (Hirschmann, 1962) | | 0 | Species | Taxom |
| Mesoplophoridae Ewing, 1917 | | 12 | Species | Taxom |
| Microtegeidae Balogh, 1972 | | 1 | Species | Taxom |
| Microtrombidiidae Womersley, 1936 | Micro velvet mites | 0 | Species | Taxom |
| Microzetidae Grandjean, 1936 | | 2 | Species | Taxom |
| Mimetidae Simon, 1881 | Pirate spider | 1 | Species | Taxom |
| Miturgidae Simon, 1885 | Long-legged sac spiders | 6 | Species | Taxom |
| Mochlozetidae Grandjean, 1960 | | 2 | Species | Taxom |
| Myobiidae Megnin, 1877 | | 18 | Species | Taxom |
| Myocoptidae Gunther, 1942 | | 1 | Species | Taxom |
| Mysmenidae Petrunkevitch, 1928 | Dwarf cobweb spiders | 1 | Species | Taxom |
| Nemesiidae Simon, 1892 | Tube Trapdoor Spiders | 2 | Species | Taxom |
| Neoliodidae (Sellnick, 1928) | | 0 | Species | Taxom |
| Neopygmephoridae Cross, 1965 | | 1 | Species | Taxom |
| Nesticidae Simon, 1894 | Cave cobweb spider | 1 | Species | Taxom |
| Ochyroceratidae Fage, 1912 | Midget ground weaver | 11 | Species | Taxom |
| Ologamasidae Ryke, 1962 | | 1 | Species | Taxom |
| Olpiidae Banks, 1895 | | 1 | Species | Taxom |
| Oncopodidae (Thorell, 1876) | | 8 | Species | Taxom |
| Oonopidae Simon, 1890 | Dwarf Cell Spiders | 44 | Species | Taxom |
| Oppiidae Sellnick, 1937 | | 6 | Species | Taxom |
| Oribotritiidae Grandjean, 1954 | | 8 | Species | Taxom |
| Oripodidae Jacot, 1925 | | 1 | Species | Taxom |
| Otocepheidae Balogh, 1961 | | 23 | Species | Taxom |
| Otopheidomenidae Treat, 1955 | | 1 | Species | Taxom |
| Oxyameridae Aoki, 1965 | | 1 | Species | Taxom |
| Oxyopidae Thorell, 1870 | Lynx spiders | 17 | Species | Taxom |
| Pachylaelapidae Berlese, 1913 | | 2 | Species | Taxom |
| Palpimanidae Thorell, 1870 | Palp-footed spiders | 3 | Species | Taxom |
| Papillonotidae Balogh, 1983 | | 1 | Species | Taxom |
| Parakalummidae Grandjean, 1936 | | 1 | Species | Taxom |
| Paramegistidae Trägårdh, 1946 | | 3 | Species | Taxom |
| Pheroliodidae Paschoal, 1987 | | 1 | Species | Taxom |
| Pholcidae C. L. Koch, 1851 | Carpenter spider | 101 | Species | Taxom |
| Phrurolithidae Banks, 1892 | Phrurolithid Spiders | 1 | Species | Taxom |
| Phrynichidae Simon, 1892 | | 1 | Species | Taxom |
| Phrynidae Blanchard, 1852 | | 1 | Species | Taxom |
| Phthiracaridae Perty, 1841 | | 9 | Species | Taxom |
| Phytoseiidae Berlese, 1916 | Phytoseiid mites | 2 | Species | Taxom |
| Phyxelididae Lehtinen, 1967 | Phyxelidid spiders | 2 | Species | Taxom |
| Pisauridae Simon, 1890 | Big wolf spider | 9 | Species | Taxom |
| Podapolipidae Husband, 1990 | | 3 | Species | Taxom |
| Podoctidae Roewer, 1912 | | 16 | Species | Taxom |
| Pontarachnidae Koenike, 1910 | | 1 | Species | Taxom |
| Proctophyllodidae Trouessart &..., 1884 | | 1 | Species | Taxom |
| Protoribatidae J. & P. Balogh, 1984 | | 2 | Species | Taxom |
| Psechridae James, 1989 | Psechrid spiders | 11 | Species | Taxom |
| Pseudochiridiidae Chamberlin, 1923 | | 1 | Species | Taxom |
| Psorergatidae Womersley, 1941 | | 6 | Species | Taxom |
| Psoroptidae Hering, 1838 | Scab mites | 1 | Species | Taxom |
| Pyroglyphidae Cunliffe, 1958 | Dust mites | 6 | Species | Taxom |
| Rhagodidae Pocock, 1897 | | 1 | Species | Taxom |
| Rhinonyssidae Trouessart, 1895 | | 2 | Species | Taxom |
| Rosensteiniidae Cooreman, 1954 | | 9 | Species | Taxom |
| Salticidae Blackwall, 1842 | Jumping Spider | 346 | Species | Taxom |
| Sandokanidae Özdikmen & K..., 2007 | | 22 | Species | Taxom |
| Sarcoptidae Megnin, 1877 | Itch mites | 24 | Species | Taxom |
| Scheloribatidae Jacot, 1935 | | 3 | Species | Taxom |
| Sclerosomatidae Simon, 1879 | Sclerosomatid Harvestmen | 65 | Species | Taxom |
| Scorpionidae Pierre André..., 1802 | Largeclaw scorpions | 3 | Species | Taxom |
| Scutacaridae Paoli, 1911 | | 5 | Species | Taxom |
| Scytodidae Blackwall, 1864 | Glue spitter | 7 | Species | Taxom |
| Sejidae Berlese, 1885 | | 0 | Species | Taxom |
| Selenopidae Simon, 1897 | Flatties | 3 | Species | Taxom |
| Sparassidae Bertkau, 1872 | Giant crab spiders | 64 | Species | Taxom |
| Spinturnicidae Oudemans, 1902 | | 7 | Species | Taxom |
| Steganacaridae (Niedbała, 1986) | | 1 | Species | Taxom |
| Stenochilidae Thorell, 1873 | Stenochilid spiders | 1 | Species | Taxom |
| Stigmaeidae Wood, 1967 | | 2 | Species | Taxom |
| Stygnidae Simon, 1879 | | 1 | Species | Taxom |
| Stylocellidae Hansen & Sör..., 1904 | | 13 | Species | Taxom |
| Suctobelbidae Jacot, 1938 | | 7 | Species | Taxom |
| Suidasiidae Hughes, 1948 | | 1 | Species | Taxom |
| Syarinidae Chamberlin, 1930 | | 1 | Species | Taxom |
| Symphytognathidae Hickman, 1931 | Dwarf orb-weavers | 3 | Species | Taxom |
| Synichotritiidae Walker, 1965 | | 2 | Species | Taxom |
| Syringophilidae Lavoipierre, 1953 | Quill mites | 1 | Species | Taxom |
| Tarsonemidae Kramer, 1877 | Tarsonemid mites | 3 | Species | Taxom |
| Telemidae Fage, 1913 | Long-legged cave spider | 4 | Species | Taxom |
| Tenuipalpidae Berlese, 1913 | False spider mites | 1 | Species | Taxom |
| Tetrablemmidae O. P-Cambridge, 1873 | Armored spider | 21 | Species | Taxom |
| Tetragnathidae Menge, 1866 | Elongated Orb Weavers | 30 | Species | Taxom |
| Tetranychidae Donnadieu, 1875 | Spider mites | 26 | Species | Taxom |
| Thelyphonidae Lucas, 1835 | | 10 | Species | Taxom |
| Theraphosidae Thorell, 1870 | Bird-eating spiders | 32 | Species | Taxom |
| Theridiidae Sundevall, 1833 | Cobweb And Widow Spiders | 48 | Species | Taxom |
| Theridiosomatidae Simon, 1881 | Ray orbweavers | 3 | Species | Taxom |
| Thomisidae Sundevall, 1833 | Crab Spider | 43 | Species | Taxom |
| Torrenticolidae Thor, 1902 | Torrent Mites | 15 | Species | Taxom |
| Trachyuropodidae Kramer, 1881 | | 1 | Species | Taxom |
| Trematuridae Berlese, 1917 | | 2 | Species | Taxom |
| Trigonuropodidae Hirschmann, 1979 | | 1 | Species | Taxom |
| Trionyxellidae Roewer, 1912 | | 3 | Species | Taxom |
| Trombiculidae Ewing, 1929 | Chigger mites | 5 | Species | Taxom |
| Trombidiidae Leach, 1815 | Beer Bahuti | 3 | Species | Taxom |
| Trouessartiidae Gaud, 1957 | | 1 | Species | Taxom |
| Turbinoptidae Fain, 1957 | | 1 | Species | Taxom |
| Uloboridae Thorell, 1869 | Cribellate orb weavers | 7 | Species | Taxom |
| Urodinychidae Berlese, 1917 | | 2 | Species | Taxom |
| Uropodidae Kramer, 1881 | | 2 | Species | Taxom |
| Varroidae Delfinado & ..., 1974 | | 3 | Species | Taxom |
| Winterschmidtiidae Oudemans, 1923 | | 0 | Species | Taxom |
| Withiidae Chamberlin, 1931 | | 2 | Species | Taxom |
| Xolalgidae Dubinin, 1953 | | 0 | Species | Taxom |
| Xylobatidae J. Balogh & ..., 1984 | | 1 | Species | Taxom |
| Zalmoxidae (Sörensen, 1886) | | 0 | Species | Taxom |
| Zodariidae Thorell, 1881 | Ant spiders | 64 | Species | Taxom |