| Acaridae Latreille, 1802 | Acarid mites | 11 | Species | Taxom |
| Achipteriidae Thor, 1929 | | 0 | Species | Taxom |
| Actinopodidae Simon, 1892 | Mouse Spiders | 2 | Species | Taxom |
| Agelenidae C. L. Koch, 1837 | Agelenid Spiders | 6 | Species | Taxom |
| Alloptidae Gaud, 1957 | | 3 | Species | Taxom |
| Alycidae Canestrini &..., 1877 | | 0 | Species | Taxom |
| Amaurobiidae Thorell, 1870 | Amaurobiids | 2 | Species | Taxom |
| Amblyommidae Banks, 1907 | | 16 | Species | Taxom |
| Ameroseiidae Evans, 1961 | | 2 | Species | Taxom |
| Ammotrechidae Roewer, 1934 | Curve-faced solifugid | 1 | Species | Taxom |
| Analgidae Trouessart &..., 1884 | Feather mites | 0 | Species | Taxom |
| Anamidae Simon, 1889 | | 2 | Species | Taxom |
| Anapidae Simon, 1895 | Anapid spiders | 11 | Species | Taxom |
| Anderemaeidae Balogh, 1972 | | 0 | Species | Taxom |
| Anyphaenidae Bertkau, 1878 | Anyphaenid sac spiders | 2 | Species | Taxom |
| Anystidae Oudemans, 1936 | Whirligig Mites | 0 | Species | Taxom |
| Araneidae Simon, 1895 | Golden orb web spiders | 218 | Species | Taxom |
| Argasidae C. L. Koch, 1844 | Soft tick | 6 | Species | Taxom |
| Arrenuridae Thor, 1900 | | 9 | Species | Taxom |
| Ascidae Oudemans, 1905 | | 8 | Species | Taxom |
| Ascouracaridae Gaud & Atyeo, 1976 | | 1 | Species | Taxom |
| Assamiidae Sørensen, 1884 | | 22 | Species | Taxom |
| Atemnidae Chamberlin, 1931 | | 13 | Species | Taxom |
| Atopomelidae Fain, 1972 | | 25 | Species | Taxom |
| Aturidae Thor, 1900 | | 13 | Species | Taxom |
| Avenzoariidae Oudemans, 1905 | | 2 | Species | Taxom |
| Barychelidae Simon, 1889 | Brush-footed trapdoors | 65 | Species | Taxom |
| Bdellidae Dugès, 1834 | Snout Mites | 0 | Species | Taxom |
| Biantidae Thorell, 1889 | | 0 | Species | Taxom |
| Blattisociidae (Garman, 1948) | | 5 | Species | Taxom |
| Bothriuridae Simon, 1880 | | 2 | Species | Taxom |
| Brachychthoniidae Thor, 1934 | | 1 | Species | Taxom |
| Buthidae C. L. Koch, 1837 | Arrowbreasted scorpions | 18 | Species | Taxom |
| Caloppiidae (Balogh, 1960) | | 1 | Species | Taxom |
| Camisiidae Oudemans, 1900 | | 1 | Species | Taxom |
| Canestriniidae Berlese, 1884 | | 16 | Species | Taxom |
| Caraboacaridae Mahunka, 1970 | | 1 | Species | Taxom |
| Caraboctonidae Kraepelin, 1905 | | 2 | Species | Taxom |
| Carabodidae Koch, 1837 | | 3 | Species | Taxom |
| Cepheusidae Berlese, 1896 | | 0 | Species | Taxom |
| Ceratokalummidae Balogh, 1970 | | 1 | Species | Taxom |
| Ceratoppiidae (Kunst, 1971) | | 1 | Species | Taxom |
| Ceratozetidae Jacot, 1925 | | 1 | Species | Taxom |
| Charassobatidae Grandjean, 1958 | | 1 | Species | Taxom |
| Charontidae Simon, 1892 | | 13 | Species | Taxom |
| Cheiracanthiidae Wagner, 1887 | Eutichurid Spiders | 2 | Species | Taxom |
| Cheiridiidae Hansen, 1893 | | 2 | Species | Taxom |
| Cheliferidae Risso, 1826 | | 9 | Species | Taxom |
| Chernetidae Menge, 1855 | | 51 | Species | Taxom |
| Cheyletidae Leach, 1815 | | 3 | Species | Taxom |
| Chirodiscidae Trouessart, 1892 | | 14 | Species | Taxom |
| Chthoniidae Daday, 1888 | | 19 | Species | Taxom |
| Clubionidae Wagner, 1887 | Clubiones | 26 | Species | Taxom |
| Cocceupodidae Jesionowska, 2010 | | 0 | Species | Taxom |
| Corinnidae Karsch, 1880 | Ant-like Sac Spiders | 12 | Species | Taxom |
| Cosmetidae C. L. Koch, 1839 | | 2 | Species | Taxom |
| Crotoniidae Thorell, 1876 | | 3 | Species | Taxom |
| Ctenidae Keyserling, 1877 | Tropical wolf spiders | 12 | Species | Taxom |
| Cunaxidae Thor, 1902 | Predatory Mites | 1 | Species | Taxom |
| Cycloctenidae Simon, 1898 | Scuttling spiders | 0 | Species | Taxom |
| Dampfiellidae Balogh, 1961 | | 1 | Species | Taxom |
| Deinopidae C. L. Koch, 1850 | Net-casters | 7 | Species | Taxom |
| Deraiophoridae Trägårdh, 1952 | | 2 | Species | Taxom |
| Dermanyssidae Kolenati, 1859 | Dermanyssid mites | 1 | Species | Taxom |
| Dermationidae Fain, 1965 | | 0 | Species | Taxom |
| Desidae Pocock, 1895 | Desid spiders | 14 | Species | Taxom |
| Dictynidae O. P-Cambridge, 1871 | Dictynid spiders | 8 | Species | Taxom |
| Digamasellidae Evans, 1957 | | 1 | Species | Taxom |
| Diplogyniidae Trägårdh, 1941 | | 3 | Species | Taxom |
| Dipluridae Simon, 1889 | Curtainweb Spiders | 13 | Species | Taxom |
| Diptilomiopidae Boczek, 1964 | | 2 | Species | Taxom |
| Dysderidae C. L. Koch, 1837 | Dysderid spiders | 2 | Species | Taxom |
| Epedanidae Sørensen, 1886 | | 0 | Species | Taxom |
| Epidermoptidae Trouessart, 1892 | | 2 | Species | Taxom |
| Eremobatidae Kraepelin, 1899 | | 1 | Species | Taxom |
| Eremobelbidae Balogh, 1961 | | 1 | Species | Taxom |
| Eremulidae Grandjean, 1965 | | 1 | Species | Taxom |
| Eriophyidae Nalepa, 1898 | Blister mites | 26 | Species | Taxom |
| Erythraeidae Oudemans, 1902 | | 13 | Species | Taxom |
| Eukoeneniidae Condé, 1965 | | 2 | Species | Taxom |
| Euphthiracaridae Jacot, 1930 | | 1 | Species | Taxom |
| Euscorpiidae Laurie, 1896 | Shorttail scorpions | 2 | Species | Taxom |
| Eustathiidae Oudemans, 1905 | | 2 | Species | Taxom |
| Eutegaeidae Balogh, 1965 | | 2 | Species | Taxom |
| Eviphididae Berlese, 1913 | | 1 | Species | Taxom |
| Falculiferidae Oudemans, 1905 | | 2 | Species | Taxom |
| Feaellidae Ellingsen, 1906 | | 0 | Species | Taxom |
| Fedrizziidae Trägårdh, 1937 | | 1 | Species | Taxom |
| Filistatidae Ausserer, 1867 | Crevice weaver | 9 | Species | Taxom |
| Gabuciniidae Gaud & Atyeo, 1975 | | 1 | Species | Taxom |
| Gallieniellidae Millot, 1947 | Gallieniellid spiders | 1 | Species | Taxom |
| Garypidae Simon, 1879 | | 3 | Species | Taxom |
| Garypinidae Daday, 1888 | | 8 | Species | Taxom |
| Gastronyssidae Fain, 1956 | | 1 | Species | Taxom |
| Geogarypidae Chamberlin, 1930 | | 5 | Species | Taxom |
| Glycyphagidae De Geer, 1778 | | 0 | Species | Taxom |
| Gnaphosidae Pocock, 1898 | Flat-bellied ground spiders | 18 | Species | Taxom |
| Gustaviidae Oudemans, 1900 | | 0 | Species | Taxom |
| Hahniidae Bertkau, 1878 | Dwarf sheet spiders | 1 | Species | Taxom |
| Halacaridae Murray, 1877 | Sea mites | 15 | Species | Taxom |
| Halonoproctidae Pocock, 1901 | | 5 | Species | Taxom |
| Haplozetidae Grandjean, 1936 | | 2 | Species | Taxom |
| Harpirhynchidae Dubinin, 1957 | | 2 | Species | Taxom |
| Hemisarcoptidae Oudemans, 1904 | | 2 | Species | Taxom |
| Hermanniellidae Grandjean, 1934 | | 2 | Species | Taxom |
| Hersiliidae Thorell, 1870 | Hersiliids | 2 | Species | Taxom |
| Heterocoptidae Fain, 1967 | | 1 | Species | Taxom |
| Hexathelidae Simon, 1892 | Australian funnelweb spiders | 4 | Species | Taxom |
| Histiostomatidae Berlese, 1897 | | 7 | Species | Taxom |
| Holothyridae Thorell, 1882 | | 5 | Species | Taxom |
| Hormuridae Laurie, 1896 | | 8 | Species | Taxom |
| Hubbardiidae Cook, 1899 | Hubbardiid shorttailed whipscorpions | 4 | Species | Taxom |
| Hutufeideriidae Hirschmann, 1979 | | 4 | Species | Taxom |
| Hyadesiidae Halbert, 1915 | | 2 | Species | Taxom |
| Hydrodromidae Viets, 1936 | | 1 | Species | Taxom |
| Hydryphantidae Piersig, 1896 | | 5 | Species | Taxom |
| Hygrobatidae Koch, 1842 | | 37 | Species | Taxom |
| Hypochthoniidae Berlese, 1910 | | 1 | Species | Taxom |
| Idiopidae Simon, 1892 | Armored trapdoor spiders | 6 | Species | Taxom |
| Ixodidae C. L. Koch, 1844 | Hard Tick | 13 | Species | Taxom |
| Knemidokoptidae (Lavoipierre ..., 1951) | | 0 | Species | Taxom |
| Laelapidae Berlese, 1892 | | 36 | Species | Taxom |
| Laminosioptidae Vitzthum, 1931 | | 0 | Species | Taxom |
| Lamponidae Simon, 1893 | White-tailed spiders | 6 | Species | Taxom |
| Leeuwenhoekiidae Womersley, 1944 | Chigger mites | 11 | Species | Taxom |
| Leptolaelapidae Karg, 1978 | | 1 | Species | Taxom |
| Limnesiidae Thor, 1900 | | 6 | Species | Taxom |
| Limnocharidae Grube, 1859 | | 1 | Species | Taxom |
| Linyphiidae Blackwall, 1859 | Dwarf spiders | 32 | Species | Taxom |
| Listrophoridae Mégnin & Tro..., 1884 | | 1 | Species | Taxom |
| Lohmanniidae Berlese, 1916 | | 1 | Species | Taxom |
| Lordalychidae Grandjean, 1939 | | 0 | Species | Taxom |
| Lycosidae Lehtinen & H..., 1979 | Ground Spiders | 51 | Species | Taxom |
| Macrochelidae Vitzthum, 1930 | | 5 | Species | Taxom |
| Macronyssidae Oudemans, 1936 | Macronyssid Mites | 4 | Species | Taxom |
| Malaconothridae Berlese, 1916 | | 1 | Species | Taxom |
| Megisthanidae Berlese, 1914 | | 2 | Species | Taxom |
| Melicharidae (Hirschmann, 1962) | | 2 | Species | Taxom |
| Mesoplophoridae Ewing, 1917 | | 2 | Species | Taxom |
| Micropholcommatidae Hickman, 1943 | Micropholcommatid spiders | 3 | Species | Taxom |
| Microtrombidiidae Womersley, 1936 | Micro velvet mites | 1 | Species | Taxom |
| Microzetidae Grandjean, 1936 | | 0 | Species | Taxom |
| Mideopsidae Koenike, 1910 | | 3 | Species | Taxom |
| Migidae Simon, 1892 | Tree trapdoor spiders | 1 | Species | Taxom |
| Mimetidae Simon, 1881 | Pirate spider | 1 | Species | Taxom |
| Miturgidae Simon, 1885 | Long-legged sac spiders | 5 | Species | Taxom |
| Mochlozetidae Grandjean, 1960 | | 0 | Species | Taxom |
| Momoniidae Viets, 1926 | | 1 | Species | Taxom |
| Myobiidae Megnin, 1877 | | 12 | Species | Taxom |
| Myocoptidae Gunther, 1942 | | 1 | Species | Taxom |
| Mysmenidae Petrunkevitch, 1928 | Dwarf cobweb spiders | 4 | Species | Taxom |
| Nanhermanniidae Sellnick, 1928 | | 1 | Species | Taxom |
| Nemastomatidae Simon, 1872 | | 1 | Species | Taxom |
| Nenteriidae Hirschmann, 1979 | | 4 | Species | Taxom |
| Neothrombiidae Feider, 1959 | | 1 | Species | Taxom |
| Neotrombidiidae Feider, 1955 | | 1 | Species | Taxom |
| Nesticidae Simon, 1894 | Cave cobweb spider | 3 | Species | Taxom |
| Nicodamidae Simon, 1898 | Nicodamid spiders | 3 | Species | Taxom |
| Nosybelbidae Mahunka, 1994 | | 7 | Species | Taxom |
| Ochyroceratidae Fage, 1912 | Midget ground weaver | 1 | Species | Taxom |
| Oecobiidae Blackwall, 1862 | Disc web spider | 2 | Species | Taxom |
| Oehserchestidae Kethley, 1977 | | 0 | Species | Taxom |
| Ologamasidae Ryke, 1962 | | 56 | Species | Taxom |
| Olpiidae Banks, 1895 | | 9 | Species | Taxom |
| Oonopidae Simon, 1890 | Dwarf Cell Spiders | 42 | Species | Taxom |
| Oppiidae Sellnick, 1937 | | 21 | Species | Taxom |
| Oribatellidae Jacot, 1925 | | 1 | Species | Taxom |
| Oribatulidae Thor, 1929 | | 0 | Species | Taxom |
| Oribotritiidae Grandjean, 1954 | | 2 | Species | Taxom |
| Orsolobidae Cooke, 1965 | Orsolobid spiders | 0 | Species | Taxom |
| Otocepheidae Balogh, 1961 | | 2 | Species | Taxom |
| Otopheidomenidae Treat, 1955 | | 1 | Species | Taxom |
| Oxidae Viets, 1926 | | 11 | Species | Taxom |
| Oxyopidae Thorell, 1870 | Lynx spiders | 3 | Species | Taxom |
| Pachylaelapidae Berlese, 1913 | | 1 | Species | Taxom |
| Parahyidae Harvey, 1992 | | 1 | Species | Taxom |
| Paramegistidae Trägårdh, 1946 | | 9 | Species | Taxom |
| Pararchaeidae Forster & Pl..., 1984 | Pararchaeid spiders | 1 | Species | Taxom |
| Parasitidae Oudemans, 1901 | Beetle Mites | 1 | Species | Taxom |
| Peloppiidae Balogh, 1943 | | 1 | Species | Taxom |
| Phalangiidae Latreille, 1802 | Daddy-Long-Legs | 2 | Species | Taxom |
| Phenopelopidae Petrunkevitch, 1955 | | 0 | Species | Taxom |
| Pheroliodidae Paschoal, 1987 | | 1 | Species | Taxom |
| Philodromidae Thorell, 1870 | False crab spiders | 1 | Species | Taxom |
| Pholcidae C. L. Koch, 1851 | Carpenter spider | 16 | Species | Taxom |
| Phrynichidae Simon, 1892 | | 1 | Species | Taxom |
| Phrynidae Blanchard, 1852 | | 1 | Species | Taxom |
| Phthiracaridae Perty, 1841 | | 17 | Species | Taxom |
| Phytoseiidae Berlese, 1916 | Phytoseiid mites | 6 | Species | Taxom |
| Pisauridae Simon, 1890 | Big wolf spider | 19 | Species | Taxom |
| Podapolipidae Husband, 1990 | | 3 | Species | Taxom |
| Podocinidae Berlese, 1913 | | 1 | Species | Taxom |
| Podoctidae Roewer, 1912 | | 29 | Species | Taxom |
| Proctophyllodidae Trouessart &..., 1884 | | 0 | Species | Taxom |
| Psechridae James, 1989 | Psechrid spiders | 3 | Species | Taxom |
| Pseudochiridiidae Chamberlin, 1923 | | 2 | Species | Taxom |
| Psorergatidae Womersley, 1941 | | 1 | Species | Taxom |
| Psoroptidae Hering, 1838 | Scab mites | 1 | Species | Taxom |
| Pterolichidae Trouessart, 1899 | | 3 | Species | Taxom |
| Pterygosomatidae Womersley, 1941 | | 4 | Species | Taxom |
| Pyemotidae Newport, 1850 | | 1 | Species | Taxom |
| Pyramidopidae Starega, 1992 | | 1 | Species | Taxom |
| Rhinonyssidae Trouessart, 1895 | | 8 | Species | Taxom |
| Rhodacaridae Oudemans, 1902 | | 1 | Species | Taxom |
| Rosensteiniidae Cooreman, 1954 | | 2 | Species | Taxom |
| Salticidae Blackwall, 1842 | Jumping Spider | 322 | Species | Taxom |
| Samoidae Sørensen, 1886 | | 3 | Species | Taxom |
| Sarcoptidae Megnin, 1877 | Itch mites | 10 | Species | Taxom |
| Scheloribatidae Jacot, 1935 | | 0 | Species | Taxom |
| Schizogyniidae Trägårdh, 1950 | | 1 | Species | Taxom |
| Sclerosomatidae Simon, 1879 | Sclerosomatid Harvestmen | 14 | Species | Taxom |
| Scorpionidae Pierre André..., 1802 | Largeclaw scorpions | 3 | Species | Taxom |
| Scutacaridae Paoli, 1911 | | 2 | Species | Taxom |
| Scytodidae Blackwall, 1864 | Glue spitter | 8 | Species | Taxom |
| Segestriidae Simon, 1893 | Six-eyed Spiders | 4 | Species | Taxom |
| Selenopidae Simon, 1897 | Flatties | 1 | Species | Taxom |
| Sicariidae Keyserling, 1880 | Brown recluse spiders | 1 | Species | Taxom |
| Smarididae Kramer, 1878 | | 1 | Species | Taxom |
| Sparassidae Bertkau, 1872 | Giant crab spiders | 66 | Species | Taxom |
| Sphaerochthoniidae Grandjean, 1947 | | 1 | Species | Taxom |
| Spinturnicidae Oudemans, 1902 | | 8 | Species | Taxom |
| Stenochilidae Thorell, 1873 | Stenochilid spiders | 1 | Species | Taxom |
| Sternophoridae J.C. Chamberlin, 1923 | | 4 | Species | Taxom |
| Stigmaeidae Wood, 1967 | | 4 | Species | Taxom |
| Stiphidiidae Dalmas, 1917 | Sheetweb spiders | 8 | Species | Taxom |
| Stygnommatidae Roewer, 1923 | | 0 | Species | Taxom |
| Suctobelbidae Jacot, 1938 | | 6 | Species | Taxom |
| Suidasiidae Hughes, 1948 | | 1 | Species | Taxom |
| Syarinidae Chamberlin, 1930 | | 5 | Species | Taxom |
| Symbioribatidae Aoki, 1966 | | 0 | Species | Taxom |
| Symphytognathidae Hickman, 1931 | Dwarf orb-weavers | 2 | Species | Taxom |
| Syringophilidae Lavoipierre, 1953 | Quill mites | 11 | Species | Taxom |
| Tanaupodidae Thor, 1935 | | 1 | Species | Taxom |
| Tarsonemidae Kramer, 1877 | Tarsonemid mites | 4 | Species | Taxom |
| Telemidae Fage, 1913 | Long-legged cave spider | 1 | Species | Taxom |
| Tengellidae (Dahl, 1908) | Tengellid spiders | 1 | Species | Taxom |
| Tenuipalpidae Berlese, 1913 | False spider mites | 11 | Species | Taxom |
| Tetrablemmidae O. P-Cambridge, 1873 | Armored spider | 9 | Species | Taxom |
| Tetragnathidae Menge, 1866 | Elongated Orb Weavers | 91 | Species | Taxom |
| Tetranychidae Donnadieu, 1875 | Spider mites | 43 | Species | Taxom |
| Thelyphonidae Lucas, 1835 | | 12 | Species | Taxom |
| Theraphosidae Thorell, 1870 | Bird-eating spiders | 12 | Species | Taxom |
| Theridiidae Sundevall, 1833 | Cobweb And Widow Spiders | 93 | Species | Taxom |
| Theridiosomatidae Simon, 1881 | Ray orbweavers | 1 | Species | Taxom |
| Thomisidae Sundevall, 1833 | Crab Spider | 43 | Species | Taxom |
| Thysanocercidae Atyeo & Pete..., 1972 | | 0 | Species | Taxom |
| Titanoecidae Lehtinen, 1967 | Rock Weavers | 1 | Species | Taxom |
| Trachyuropodidae Kramer, 1881 | | 1 | Species | Taxom |
| Trechaleidae Simon, 1890 | Trechaleid spiders | 1 | Species | Taxom |
| Trematuridae Berlese, 1917 | | 10 | Species | Taxom |
| Triaenonychidae Sörensen, 1886 | | 3 | Species | Taxom |
| Trigonuropodidae Hirschmann, 1979 | | 3 | Species | Taxom |
| Trochanteriidae Karsch, 1879 | Flat spiders | 5 | Species | Taxom |
| Troglosironidae Shear, 1993 | | 12 | Species | Taxom |
| Trombellidae Thor, 1935 | | 1 | Species | Taxom |
| Trombiculidae Ewing, 1929 | Chigger mites | 52 | Species | Taxom |
| Trombidiidae Leach, 1815 | Beer Bahuti | 3 | Species | Taxom |
| Trouessartiidae Gaud, 1957 | | 1 | Species | Taxom |
| Uloboridae Thorell, 1869 | Cribellate orb weavers | 16 | Species | Taxom |
| Unionicolidae Oudemans, 1909 | | 17 | Species | Taxom |
| Urodinychidae Berlese, 1917 | | 12 | Species | Taxom |
| Uropodidae Kramer, 1881 | | 19 | Species | Taxom |
| Vaejovidae Thorell, 1876 | | 2 | Species | Taxom |
| Veigaiidae Oudemans, 1939 | | 1 | Species | Taxom |
| Winterschmidtiidae Oudemans, 1923 | | 0 | Species | Taxom |
| Withiidae Chamberlin, 1931 | | 3 | Species | Taxom |
| Xolalgidae Dubinin, 1953 | | 1 | Species | Taxom |
| Zalmoxidae (Sörensen, 1886) | | 44 | Species | Taxom |
| Zodariidae Thorell, 1881 | Ant spiders | 14 | Species | Taxom |
| Zoridae F. O. P-Camb..., 1893 | Wandering Spiders | 3 | Species | Taxom |
