| Acalyptonotidae Walter, 1911 | | 1 | Species | Taxom |
| Acaridae Latreille, 1802 | Acarid mites | 15 | Species | Taxom |
| Acarophenacidae Cross, 1965 | | 1 | Species | Taxom |
| Achipteriidae Thor, 1929 | | 5 | Species | Taxom |
| Actinopodidae Simon, 1892 | Mouse Spiders | 2 | Species | Taxom |
| Agelenidae C. L. Koch, 1837 | Agelenid Spiders | 33 | Species | Taxom |
| Algophagidae Fain, 1974 | | 1 | Species | Taxom |
| Alicorhagiidae Grandjean, 1939 | | 2 | Species | Taxom |
| Alycidae Canestrini &..., 1877 | | 5 | Species | Taxom |
| Amaurobiidae Thorell, 1870 | Amaurobiids | 14 | Species | Taxom |
| Amblyommidae Banks, 1907 | | 16 | Species | Taxom |
| Ameronothridae Willmann, 1931 | | 3 | Species | Taxom |
| Ameroseiidae Evans, 1961 | | 14 | Species | Taxom |
| Analgidae Trouessart &..., 1884 | Feather mites | 6 | Species | Taxom |
| Anamidae Simon, 1889 | | 10 | Species | Taxom |
| Anapidae Simon, 1895 | Anapid spiders | 7 | Species | Taxom |
| Anisitsiellidae Koenike, 1910 | | 2 | Species | Taxom |
| Antennophoridae Berlese, 1892 | | 1 | Species | Taxom |
| Anyphaenidae Bertkau, 1878 | Anyphaenid sac spiders | 2 | Species | Taxom |
| Anystidae Oudemans, 1936 | Whirligig Mites | 2 | Species | Taxom |
| Araneidae Simon, 1895 | Golden orb web spiders | 130 | Species | Taxom |
| Archaeidae C. L. Koch &..., 1854 | Archaeid spiders | 2 | Species | Taxom |
| Arctacaridae Evans, 1955 | | 0 | Species | Taxom |
| Argasidae C. L. Koch, 1844 | Soft tick | 7 | Species | Taxom |
| Arrenuridae Thor, 1900 | | 56 | Species | Taxom |
| Ascidae Oudemans, 1905 | | 29 | Species | Taxom |
| Astegistidae Balogh, 1961 | | 3 | Species | Taxom |
| Athienemanniidae Viets, 1922 | | 2 | Species | Taxom |
| Atopochthoniidae Grandjean, 1949 | | 1 | Species | Taxom |
| Atopomelidae Fain, 1972 | | 1 | Species | Taxom |
| Aturidae Thor, 1900 | | 10 | Species | Taxom |
| Atypidae Thorell, 1870 | Atypical tarantulas | 2 | Species | Taxom |
| Autognetidae Grandjean, 1960 | | 5 | Species | Taxom |
| Baltsuccinidae Wunderlich, 2004 | | 1 | Species | Taxom |
| Barychelidae Simon, 1889 | Brush-footed trapdoors | 7 | Species | Taxom |
| Bdellidae Dugès, 1834 | Snout Mites | 9 | Species | Taxom |
| Belbodamaeidae (Bulanova-Zac..., 1967) | | 1 | Species | Taxom |
| Blattisociidae (Garman, 1948) | | 35 | Species | Taxom |
| Brachychthoniidae Thor, 1934 | | 53 | Species | Taxom |
| Caleremaeidae Grandjean, 1965 | | 1 | Species | Taxom |
| Calyptostomatidae Oudemans, 1923 | | 1 | Species | Taxom |
| Camisiidae Oudemans, 1900 | | 1 | Species | Taxom |
| Caraboacaridae Mahunka, 1970 | | 1 | Species | Taxom |
| Carabodidae Koch, 1837 | | 16 | Species | Taxom |
| Carpoglyphidae Oudemans, 1923 | Driedfruit mites | 2 | Species | Taxom |
| Celaenopsidae Berlese, 1892 | | 3 | Species | Taxom |
| Cepheusidae Berlese, 1896 | | 2 | Species | Taxom |
| Ceratoppiidae (Kunst, 1971) | | 2 | Species | Taxom |
| Ceratozetidae Jacot, 1925 | | 23 | Species | Taxom |
| Chamobatidae Thor, 1937 | | 8 | Species | Taxom |
| Charinidae Quintero, 1986 | | 1 | Species | Taxom |
| Cheyletidae Leach, 1815 | | 6 | Species | Taxom |
| Chortoglyphidae Berlese, 1897 | | 1 | Species | Taxom |
| Clubionidae Wagner, 1887 | Clubiones | 43 | Species | Taxom |
| Cocceupodidae Jesionowska, 2010 | | 2 | Species | Taxom |
| Corinnidae Karsch, 1880 | Ant-like Sac Spiders | 19 | Species | Taxom |
| Crotoniidae Thorell, 1876 | | 21 | Species | Taxom |
| Ctenidae Keyserling, 1877 | Tropical wolf spiders | 3 | Species | Taxom |
| Ctenizidae Thorell, 1887 | Cork-lid trapdoor spider | 0 | Species | Taxom |
| Cunaxidae Thor, 1902 | Predatory Mites | 2 | Species | Taxom |
| Cyatholipidae Simon, 1894 | Cyatholipid spiders | 3 | Species | Taxom |
| Cybaeidae Banks, 1892 | Pond Water Spiders | 4 | Species | Taxom |
| Cymbaeremaeidae Sellnick, 1928 | | 1 | Species | Taxom |
| Damaeidae Berlese, 1896 | | 26 | Species | Taxom |
| Deinopidae C. L. Koch, 1850 | Net-casters | 1 | Species | Taxom |
| Demodecidae Nicolet, 1855 | Follicle mites | 6 | Species | Taxom |
| Dermanyssidae Kolenati, 1859 | Dermanyssid mites | 13 | Species | Taxom |
| Desidae Pocock, 1895 | Desid spiders | 3 | Species | Taxom |
| Dictynidae O. P-Cambridge, 1871 | Dictynid spiders | 47 | Species | Taxom |
| Digamasellidae Evans, 1957 | | 41 | Species | Taxom |
| Dipluridae Simon, 1889 | Curtainweb Spiders | 1 | Species | Taxom |
| Diptilomiopidae Boczek, 1964 | | 5 | Species | Taxom |
| Dysderidae C. L. Koch, 1837 | Dysderid spiders | 7 | Species | Taxom |
| Eniochthoniidae Grandjean, 1947 | | 1 | Species | Taxom |
| Epicriidae Berlese, 1885 | | 4 | Species | Taxom |
| Epidermoptidae Trouessart, 1892 | | 4 | Species | Taxom |
| Eremaeidae Oudemans, 1900 | | 6 | Species | Taxom |
| Eresidae C. L. Koch, 1851 | Eresid spiders | 1 | Species | Taxom |
| Ereynetidae Schrank, 1776 | | 3 | Species | Taxom |
| Eriophyidae Nalepa, 1898 | Blister mites | 257 | Species | Taxom |
| Erythracaridae (Oudemans, 1936) | | 1 | Species | Taxom |
| Erythraeidae Oudemans, 1902 | | 22 | Species | Taxom |
| Eulohmanniidae Grandjean, 1931 | | 1 | Species | Taxom |
| Euphthiracaridae Jacot, 1930 | | 7 | Species | Taxom |
| Eupodidae Strandtmann, 1967 | Eupodid mites | 2 | Species | Taxom |
| Eustathiidae Oudemans, 1905 | | 1 | Species | Taxom |
| Eviphididae Berlese, 1913 | | 9 | Species | Taxom |
| Eylaidae Leach, 1815 | | 11 | Species | Taxom |
| Fedrizziidae Trägårdh, 1937 | | 2 | Species | Taxom |
| Feltriidae Viets, 1926 | | 1 | Species | Taxom |
| Gallieniellidae Millot, 1947 | Gallieniellid spiders | 1 | Species | Taxom |
| Galumnidae Jacot, 1925 | | 8 | Species | Taxom |
| Glycyphagidae De Geer, 1778 | | 6 | Species | Taxom |
| Gnaphosidae Pocock, 1898 | Flat-bellied ground spiders | 109 | Species | Taxom |
| Gustaviidae Oudemans, 1900 | | 1 | Species | Taxom |
| Hahniidae Bertkau, 1878 | Dwarf sheet spiders | 14 | Species | Taxom |
| Halacaridae Murray, 1877 | Sea mites | 62 | Species | Taxom |
| Halarachnidae Oudemans, 1906 | | 2 | Species | Taxom |
| Halolaelapidae Karg, 1965 | | 9 | Species | Taxom |
| Haplozetidae Grandjean, 1936 | | 2 | Species | Taxom |
| Harpirhynchidae Dubinin, 1957 | | 1 | Species | Taxom |
| Hemileiidae (J. & P. Balogh, 1984) | | 3 | Species | Taxom |
| Hermanniellidae Grandjean, 1934 | | 1 | Species | Taxom |
| Hermanniidae Sellnick, 1928 | | 3 | Species | Taxom |
| Hersiliidae Thorell, 1870 | Hersiliids | 2 | Species | Taxom |
| Hexathelidae Simon, 1892 | Australian funnelweb spiders | 5 | Species | Taxom |
| Histiostomatidae Berlese, 1897 | | 4 | Species | Taxom |
| Hubbardiidae Cook, 1899 | Hubbardiid shorttailed whipscorpions | 1 | Species | Taxom |
| Humerobatidae Grandjean, 1970 | | 3 | Species | Taxom |
| Hyadesiidae Halbert, 1915 | | 1 | Species | Taxom |
| Hydrachnidae Leach, 1815 | | 10 | Species | Taxom |
| Hydrodromidae Viets, 1936 | | 2 | Species | Taxom |
| Hydrovolziidae Thor, 1905 | | 1 | Species | Taxom |
| Hydrozetidae Grandjean, 1954 | | 1 | Species | Taxom |
| Hydryphantidae Piersig, 1896 | | 36 | Species | Taxom |
| Hygrobatidae Koch, 1842 | | 20 | Species | Taxom |
| Hypochthoniidae Berlese, 1910 | | 1 | Species | Taxom |
| Hypoderidae Murray, 1877 | | 0 | Species | Taxom |
| Ichthyostomatogasteridae (Sellnick, 1953) | | 1 | Species | Taxom |
| Idiopidae Simon, 1892 | Armored trapdoor spiders | 5 | Species | Taxom |
| Iolinidae Pritchard, 1956 | | 5 | Species | Taxom |
| Ixodidae C. L. Koch, 1844 | Hard Tick | 35 | Species | Taxom |
| Johnstonianidae Thor, 1935 | | 2 | Species | Taxom |
| Knemidokoptidae (Lavoipierre ..., 1951) | | 1 | Species | Taxom |
| Labidostommatidae Oudemans, 1904 | | 1 | Species | Taxom |
| Laelapidae Berlese, 1892 | | 88 | Species | Taxom |
| Lamponidae Simon, 1893 | White-tailed spiders | 19 | Species | Taxom |
| Lebertiidae Thor, 1900 | | 19 | Species | Taxom |
| Leeuwenhoekiidae Womersley, 1944 | Chigger mites | 0 | Species | Taxom |
| Liacaridae Sellnick, 1928 | | 5 | Species | Taxom |
| Licneremaeidae Grandjean, 1931 | | 1 | Species | Taxom |
| Liebstadiidae J. & P. Balogh, 1984 | | 6 | Species | Taxom |
| Limnesiidae Thor, 1900 | | 6 | Species | Taxom |
| Limnocharidae Grube, 1859 | | 1 | Species | Taxom |
| Limnozetidae Thor, 1937 | | 1 | Species | Taxom |
| Linyphiidae Blackwall, 1859 | Dwarf spiders | 538 | Species | Taxom |
| Liocranidae Simon, 1897 | Liocranid sac spiders | 18 | Species | Taxom |
| Listrophoridae Mégnin & Tro..., 1884 | | 1 | Species | Taxom |
| Lycosidae Lehtinen & H..., 1979 | Ground Spiders | 160 | Species | Taxom |
| Macrochelidae Vitzthum, 1930 | | 24 | Species | Taxom |
| Macronyssidae Oudemans, 1936 | Macronyssid Mites | 5 | Species | Taxom |
| Malaconothridae Berlese, 1916 | | 9 | Species | Taxom |
| Malkaridae Davies, 1980 | Malkarids | 0 | Species | Taxom |
| Mecicobothriidae Holmberg, 1882 | Dwarf tarantula | 1 | Species | Taxom |
| Melicharidae (Hirschmann, 1962) | | 8 | Species | Taxom |
| Micreremidae Grandjean, 1954 | | 1 | Species | Taxom |
| Microgyniidae Trägårdh, 1942 | | 2 | Species | Taxom |
| Micropholcommatidae Hickman, 1943 | Micropholcommatid spiders | 2 | Species | Taxom |
| Microtrombidiidae Womersley, 1936 | Micro velvet mites | 7 | Species | Taxom |
| Micryphantidae (Bertkau, 1872) | | 1 | Species | Taxom |
| Mideidae Thor, 1911 | | 1 | Species | Taxom |
| Mideopsidae Koenike, 1910 | | 4 | Species | Taxom |
| Migidae Simon, 1892 | Tree trapdoor spiders | 1 | Species | Taxom |
| Mimetidae Simon, 1881 | Pirate spider | 5 | Species | Taxom |
| Miturgidae Simon, 1885 | Long-legged sac spiders | 16 | Species | Taxom |
| Momoniidae Viets, 1926 | | 1 | Species | Taxom |
| Myobiidae Megnin, 1877 | | 2 | Species | Taxom |
| Myocoptidae Gunther, 1942 | | 0 | Species | Taxom |
| Mysmenidae Petrunkevitch, 1928 | Dwarf cobweb spiders | 2 | Species | Taxom |
| Nanhermanniidae Sellnick, 1928 | | 4 | Species | Taxom |
| Nanorchestidae Luxton, 1984 | | 3 | Species | Taxom |
| Nemesiidae Simon, 1892 | Tube Trapdoor Spiders | 1 | Species | Taxom |
| Nenteriidae Hirschmann, 1979 | | 1 | Species | Taxom |
| Neoliodidae (Sellnick, 1928) | | 2 | Species | Taxom |
| Neopygmephoridae Cross, 1965 | | 7 | Species | Taxom |
| Neothrombiidae Feider, 1959 | | 1 | Species | Taxom |
| Nesticidae Simon, 1894 | Cave cobweb spider | 3 | Species | Taxom |
| Nicodamidae Simon, 1898 | Nicodamid spiders | 4 | Species | Taxom |
| Nothridae Berlese, 1896 | | 8 | Species | Taxom |
| Oecobiidae Blackwall, 1862 | Disc web spider | 5 | Species | Taxom |
| Ologamasidae Ryke, 1962 | | 17 | Species | Taxom |
| Oonopidae Simon, 1890 | Dwarf Cell Spiders | 8 | Species | Taxom |
| Oppiidae Sellnick, 1937 | | 19 | Species | Taxom |
| Oribatellidae Jacot, 1925 | | 6 | Species | Taxom |
| Oribatulidae Thor, 1929 | | 8 | Species | Taxom |
| Oribellidae (Kunst, 1971) | | 4 | Species | Taxom |
| Oribotritiidae Grandjean, 1954 | | 4 | Species | Taxom |
| Orsolobidae Cooke, 1965 | Orsolobid spiders | 1 | Species | Taxom |
| Oxidae Viets, 1926 | | 9 | Species | Taxom |
| Oxyopidae Thorell, 1870 | Lynx spiders | 13 | Species | Taxom |
| Pachylaelapidae Berlese, 1913 | | 12 | Species | Taxom |
| Palaeacaridae Grandjean, 1932 | | 2 | Species | Taxom |
| Palpimanidae Thorell, 1870 | Palp-footed spiders | 1 | Species | Taxom |
| Parakalummidae Grandjean, 1936 | | 2 | Species | Taxom |
| Pararchaeidae Forster & Pl..., 1984 | Pararchaeid spiders | 1 | Species | Taxom |
| Parasitidae Oudemans, 1901 | Beetle Mites | 86 | Species | Taxom |
| Parholaspididae Evans, 1956 | | 2 | Species | Taxom |
| Penthaleidae Oudemans, 1931 | Earth Mites | 2 | Species | Taxom |
| Penthalodidae Strandtmann, 1964 | | 1 | Species | Taxom |
| Phaulodinychidae (Berlese, 1917) | | 1 | Species | Taxom |
| Phenopelopidae Petrunkevitch, 1955 | | 8 | Species | Taxom |
| Philodromidae Thorell, 1870 | False crab spiders | 42 | Species | Taxom |
| Pholcidae C. L. Koch, 1851 | Carpenter spider | 13 | Species | Taxom |
| Phrurolithidae Banks, 1892 | Phrurolithid Spiders | 1 | Species | Taxom |
| Phthiracaridae Perty, 1841 | | 18 | Species | Taxom |
| Phytoptidae Manson, 1970 | | 17 | Species | Taxom |
| Phytoseiidae Berlese, 1916 | Phytoseiid mites | 59 | Species | Taxom |
| Piersigiidae Oudemans, 1902 | | 1 | Species | Taxom |
| Pimoidae Wunderlich, 1986 | Pimoid spiders | 2 | Species | Taxom |
| Pionidae Thor, 1900 | | 45 | Species | Taxom |
| Pisauridae Simon, 1890 | Big wolf spider | 9 | Species | Taxom |
| Plectreuridae Simon, 1893 | Plectreurid spider | 1 | Species | Taxom |
| Podapolipidae Husband, 1990 | | 2 | Species | Taxom |
| Polyaspididae Berlese, 1913 | | 11 | Species | Taxom |
| Pontarachnidae Koenike, 1910 | | 1 | Species | Taxom |
| Proctophyllodidae Trouessart &..., 1884 | | 10 | Species | Taxom |
| Psorergatidae Womersley, 1941 | | 0 | Species | Taxom |
| Psoroptidae Hering, 1838 | Scab mites | 4 | Species | Taxom |
| Psoroptoididae Gaud, 1958 | | 1 | Species | Taxom |
| Pterolichidae Trouessart, 1899 | | 4 | Species | Taxom |
| Pteronyssidae Oudemans, 1941 | | 1 | Species | Taxom |
| Punctoribatidae Thor, 1937 | | 9 | Species | Taxom |
| Pyemotidae Newport, 1850 | | 3 | Species | Taxom |
| Pyroglyphidae Cunliffe, 1958 | Dust mites | 4 | Species | Taxom |
| Quadroppiidae Balogh, 1983 | | 1 | Species | Taxom |
| Rhagidiidae Zacharda, 1980 | | 10 | Species | Taxom |
| Rhinonyssidae Trouessart, 1895 | | 1 | Species | Taxom |
| Rhodacaridae Oudemans, 1902 | | 16 | Species | Taxom |
| Rosensteiniidae Cooreman, 1954 | | 1 | Species | Taxom |
| Salticidae Blackwall, 1842 | Jumping Spider | 207 | Species | Taxom |
| Sarcoptidae Megnin, 1877 | Itch mites | 5 | Species | Taxom |
| Scheloribatidae Jacot, 1935 | | 3 | Species | Taxom |
| Scutacaridae Paoli, 1911 | | 1 | Species | Taxom |
| Scytodidae Blackwall, 1864 | Glue spitter | 1 | Species | Taxom |
| Segestriidae Simon, 1893 | Six-eyed Spiders | 4 | Species | Taxom |
| Sejidae Berlese, 1885 | | 3 | Species | Taxom |
| Sicariidae Keyserling, 1880 | Brown recluse spiders | 2 | Species | Taxom |
| Siteroptidae Martin, 1978 | Siteroptid mites | 5 | Species | Taxom |
| Smarididae Kramer, 1878 | | 1 | Species | Taxom |
| Sparassidae Bertkau, 1872 | Giant crab spiders | 18 | Species | Taxom |
| Spatiatoridae Petrunkevitch, 1942 | | 2 | Species | Taxom |
| Sperchontidae Thor, 1900 | | 12 | Species | Taxom |
| Spinturnicidae Oudemans, 1902 | | 10 | Species | Taxom |
| Stigmaeidae Wood, 1967 | | 2 | Species | Taxom |
| Stiphidiidae Dalmas, 1917 | Sheetweb spiders | 5 | Species | Taxom |
| Stygothrombiidae Thor, 1935 | | 0 | Species | Taxom |
| Suctobelbidae Jacot, 1938 | | 21 | Species | Taxom |
| Synotaxidae Simon, 1894 | Synotaxid spiders | 3 | Species | Taxom |
| Syringobiidae Trouessart, 1897 | | 0 | Species | Taxom |
| Syringophilidae Lavoipierre, 1953 | Quill mites | 1 | Species | Taxom |
| Tanaupodidae Thor, 1935 | | 1 | Species | Taxom |
| Tarsonemidae Kramer, 1877 | Tarsonemid mites | 14 | Species | Taxom |
| Tectocepheidae Grandjean, 1954 | | 2 | Species | Taxom |
| Tegoribatidae Grandjean, 1954 | | 3 | Species | Taxom |
| Tengellidae (Dahl, 1908) | Tengellid spiders | 1 | Species | Taxom |
| Tenuialidae Jacot, 1929 | | 1 | Species | Taxom |
| Tenuipalpidae Berlese, 1913 | False spider mites | 7 | Species | Taxom |
| Tetrablemmidae O. P-Cambridge, 1873 | Armored spider | 0 | Species | Taxom |
| Tetragnathidae Menge, 1866 | Elongated Orb Weavers | 39 | Species | Taxom |
| Tetranychidae Donnadieu, 1875 | Spider mites | 34 | Species | Taxom |
| Teutoniidae Koenike, 1910 | | 1 | Species | Taxom |
| Theraphosidae Thorell, 1870 | Bird-eating spiders | 2 | Species | Taxom |
| Theridiidae Sundevall, 1833 | Cobweb And Widow Spiders | 150 | Species | Taxom |
| Theridiosomatidae Simon, 1881 | Ray orbweavers | 1 | Species | Taxom |
| Thermacaridae Sokolow, 1927 | | 1 | Species | Taxom |
| Thomisidae Sundevall, 1833 | Crab Spider | 88 | Species | Taxom |
| Thyrisomidae Grandjean, 1953 | | 2 | Species | Taxom |
| Titanoecidae Lehtinen, 1967 | Rock Weavers | 6 | Species | Taxom |
| Torrenticolidae Thor, 1902 | Torrent Mites | 5 | Species | Taxom |
| Trachytidae Tragärdh, 1938 | | 2 | Species | Taxom |
| Trachyuropodidae Kramer, 1881 | | 14 | Species | Taxom |
| Trechaleidae Simon, 1890 | Trechaleid spiders | 2 | Species | Taxom |
| Trematuridae Berlese, 1917 | | 19 | Species | Taxom |
| Trhypochthoniidae Willmann, 1931 | | 6 | Species | Taxom |
| Triophtydeidae (André, 1980) | | 5 | Species | Taxom |
| Trochanteriidae Karsch, 1879 | Flat spiders | 7 | Species | Taxom |
| Trombiculidae Ewing, 1929 | Chigger mites | 4 | Species | Taxom |
| Trombidiidae Leach, 1815 | Beer Bahuti | 15 | Species | Taxom |
| Trouessartiidae Gaud, 1957 | | 4 | Species | Taxom |
| Tydeidae Kramer, 1877 | Tydeid mites | 66 | Species | Taxom |
| Uloboridae Thorell, 1869 | Cribellate orb weavers | 7 | Species | Taxom |
| Unduloribatidae Kunst, 1971 | | 1 | Species | Taxom |
| Unionicolidae Oudemans, 1909 | | 17 | Species | Taxom |
| Urodinychidae Berlese, 1917 | | 27 | Species | Taxom |
| Uropodidae Kramer, 1881 | | 13 | Species | Taxom |
| Varroidae Delfinado & ..., 1974 | | 1 | Species | Taxom |
| Veigaiidae Oudemans, 1939 | | 9 | Species | Taxom |
| Wettinidae Cook, 1956 | | 1 | Species | Taxom |
| Xenillidae Woolley & Hi..., 1966 | | 1 | Species | Taxom |
| Zerconidae Berlese, 1892 | | 22 | Species | Taxom |
| Zodariidae Thorell, 1881 | Ant spiders | 17 | Species | Taxom |
| Zoridae F. O. P-Camb..., 1893 | Wandering Spiders | 7 | Species | Taxom |
| Zoropsidae Bertkau, 1882 | False Huntsman Spiders | 6 | Species | Taxom |
