| Acaronychidae Grandjean, 1932 | | 9 | Species | Taxom |
| Achipteriidae Thor, 1929 | | 52 | Species | Taxom |
| Adamystidae Cunliffe, 1957 | | 10 | Species | Taxom |
| Adelphacaridae Grandjean, 1954 | | 3 | Species | Taxom |
| Agelenidae C. L. Koch, 1837 | Agelenid Spiders | 273 | Species | Taxom |
| Akravidae Levy, 2007 | | 1 | Species | Taxom |
| Aleurodamaeidae Paschoal & J..., 1985 | | 3 | Species | Taxom |
| Algophagidae Fain, 1974 | | 4 | Species | Taxom |
| Alicorhagiidae Grandjean, 1939 | | 5 | Species | Taxom |
| Alycidae Canestrini &..., 1877 | | 15 | Species | Taxom |
| Amblyommidae Banks, 1907 | | 44 | Species | Taxom |
| Ameridae Grandjean, 1965 | | 5 | Species | Taxom |
| Amerobelbidae Grandjean, 1954 | | 8 | Species | Taxom |
| Ameronothridae Willmann, 1931 | | 10 | Species | Taxom |
| Ameroseiidae Evans, 1961 | | 35 | Species | Taxom |
| Ametroproctidae Subías, 2004 | | 4 | Species | Taxom |
| Anderemaeidae Balogh, 1972 | | 1 | Species | Taxom |
| Anisitsiellidae Koenike, 1910 | | 2 | Species | Taxom |
| Anystidae Oudemans, 1936 | Whirligig Mites | 36 | Species | Taxom |
| Araneidae Simon, 1895 | Golden orb web spiders | 190 | Species | Taxom |
| Arborichthoniidae J. & P. Balogh, 1992 | | 1 | Species | Taxom |
| Arceremaeidae Balogh, 1972 | | 1 | Species | Taxom |
| Archaeobuthidae Lourenço, 2001 | | 1 | Species | Taxom |
| Argasidae C. L. Koch, 1844 | Soft tick | 4 | Species | Taxom |
| Ascidae Oudemans, 1905 | | 120 | Species | Taxom |
| Astegistidae Balogh, 1961 | | 22 | Species | Taxom |
| Atemnidae Chamberlin, 1931 | | 11 | Species | Taxom |
| Atopochthoniidae Grandjean, 1949 | | 3 | Species | Taxom |
| Aturidae Thor, 1900 | | 1 | Species | Taxom |
| Autognetidae Grandjean, 1960 | | 23 | Species | Taxom |
| Barbutiidae Robaux, 1975 | | 5 | Species | Taxom |
| Belbidae (Willmann, 1931) | | 2 | Species | Taxom |
| Belisariidae Lourenço, 1998 | | 1 | Species | Taxom |
| Blattisociidae (Garman, 1948) | | 74 | Species | Taxom |
| Bochicidae Chamberlin, 1930 | | 2 | Species | Taxom |
| Brachychthoniidae Thor, 1934 | | 98 | Species | Taxom |
| Buthidae C. L. Koch, 1837 | Arrowbreasted scorpions | 283 | Species | Taxom |
| Caeculidae Berlese, 1883 | Rake-legged mites | 28 | Species | Taxom |
| Caleremaeidae Grandjean, 1965 | | 6 | Species | Taxom |
| Caligonellidae Grandjean, 1944 | | 47 | Species | Taxom |
| Calyptostomatidae Oudemans, 1923 | | 7 | Species | Taxom |
| Camerobiidae Southcott, 1957 | Stilt-legged mites | 87 | Species | Taxom |
| Camisiidae Oudemans, 1900 | | 3 | Species | Taxom |
| Canestriniidae Berlese, 1884 | | 59 | Species | Taxom |
| Carabodidae Koch, 1837 | | 81 | Species | Taxom |
| Carpoglyphidae Oudemans, 1923 | Driedfruit mites | 4 | Species | Taxom |
| Cepheidae (Berlese, 1896) | | 3 | Species | Taxom |
| Cepheusidae Berlese, 1896 | | 41 | Species | Taxom |
| Ceratoppiidae (Kunst, 1971) | | 18 | Species | Taxom |
| Ceratozetidae Jacot, 1925 | | 175 | Species | Taxom |
| Chactidae Reginald Inn..., 1893 | Fatclaw scorpions | 2 | Species | Taxom |
| Chaetodactylidae Zakhvatkin, 1941 | | 10 | Species | Taxom |
| Chamobatidae Thor, 1937 | | 32 | Species | Taxom |
| Charontidae Simon, 1892 | | 8 | Species | Taxom |
| Cheiridiidae Hansen, 1893 | | 4 | Species | Taxom |
| Cheliferidae Risso, 1826 | | 84 | Species | Taxom |
| Chernetidae Menge, 1855 | | 80 | Species | Taxom |
| Cheyletidae Leach, 1815 | | 131 | Species | Taxom |
| Chthoniidae Daday, 1888 | | 352 | Species | Taxom |
| Cloacaridae Camin, Moss,..., 1967 | | 3 | Species | Taxom |
| Cocceupodidae Jesionowska, 2010 | | 14 | Species | Taxom |
| Collohmanniidae Grandjean, 1958 | | 2 | Species | Taxom |
| Cosmochthoniidae Grandjean, 1946 | | 28 | Species | Taxom |
| Crotoniidae Thorell, 1876 | | 30 | Species | Taxom |
| Cryptognathidae Luxton, 1973 | | 40 | Species | Taxom |
| Ctenacaridae Grandjean, 1954 | | 7 | Species | Taxom |
| Ctenobelbidae Grandjean, 1965 | | 29 | Species | Taxom |
| Cymbaeremaeidae Sellnick, 1928 | | 13 | Species | Taxom |
| Daesiidae Kraepelin, 1899 | | 39 | Species | Taxom |
| Damaeidae Berlese, 1896 | | 183 | Species | Taxom |
| Damaeolidae Grandjean, 1965 | | 7 | Species | Taxom |
| Dasythyreidae Walter & Gerson, 1998 | | 1 | Species | Taxom |
| Demodecidae Nicolet, 1855 | Follicle mites | 63 | Species | Taxom |
| Dermanyssidae Kolenati, 1859 | Dermanyssid mites | 19 | Species | Taxom |
| Digamasellidae Evans, 1957 | | 3 | Species | Taxom |
| Dytiscacaridae Hajikanbar a..., 2018 | | 1 | Species | Taxom |
| Eniochthoniidae Grandjean, 1947 | | 2 | Species | Taxom |
| Entonyssidae Ewing, 1922 | | 4 | Species | Taxom |
| Epilohmanniidae Oudemans, 1923 | | 16 | Species | Taxom |
| Epimerellidae Ayyildiz & L..., 1989 | | 9 | Species | Taxom |
| Epimyodicidae Fain, Lukosc..., 1982 | | 3 | Species | Taxom |
| Eremaeidae Oudemans, 1900 | | 29 | Species | Taxom |
| Eremellidae Balogh, 1961 | | 3 | Species | Taxom |
| Eremobelbidae Balogh, 1961 | | 4 | Species | Taxom |
| Eremulidae Grandjean, 1965 | | 5 | Species | Taxom |
| Eriophyidae Nalepa, 1898 | Blister mites | 1 | Species | Taxom |
| Erythracaridae (Oudemans, 1936) | | 8 | Species | Taxom |
| Erythraeidae Oudemans, 1902 | | 349 | Species | Taxom |
| Eukoeneniidae Condé, 1965 | | 39 | Species | Taxom |
| Eulohmanniidae Grandjean, 1931 | | 2 | Species | Taxom |
| Eupalopsellidae Willmann, 1952 | | 14 | Species | Taxom |
| Euphthiracaridae Jacot, 1930 | | 24 | Species | Taxom |
| Eupodidae Strandtmann, 1967 | Eupodid mites | 32 | Species | Taxom |
| Euscorpiidae Laurie, 1896 | Shorttail scorpions | 95 | Species | Taxom |
| Fortuyniidae Hammen, 1963 | | 1 | Species | Taxom |
| Galeodidae Sundevall, 1833 | | 127 | Species | Taxom |
| Galumnellidae Piffl, 1970 | | 3 | Species | Taxom |
| Galumnidae Jacot, 1925 | | 88 | Species | Taxom |
| Garypidae Simon, 1879 | | 5 | Species | Taxom |
| Garypinidae Daday, 1888 | | 13 | Species | Taxom |
| Gehypochthoniidae Strenzke, 1963 | | 2 | Species | Taxom |
| Geogarypidae Chamberlin, 1930 | | 10 | Species | Taxom |
| Gnaphosidae Pocock, 1898 | Flat-bellied ground spiders | 789 | Species | Taxom |
| Granuloppiidae Balogh, 1983 | | 1 | Species | Taxom |
| Gustaviidae Oudemans, 1900 | | 7 | Species | Taxom |
| Gylippidae Lawrence, 1968 | | 23 | Species | Taxom |
| Gymnodamaeidae Grandjean, 1954 | | 37 | Species | Taxom |
| Halarachnidae Oudemans, 1906 | | 4 | Species | Taxom |
| Haplochthoniidae Van der Hammen, 1959 | | 8 | Species | Taxom |
| Haplozetidae Grandjean, 1936 | | 38 | Species | Taxom |
| Harpirhynchidae Dubinin, 1957 | | 37 | Species | Taxom |
| Hemileiidae (J. & P. Balogh, 1984) | | 27 | Species | Taxom |
| Hemisarcoptidae Oudemans, 1904 | | 12 | Species | Taxom |
| Hemiscorpiidae Pocock, 1893 | Longtail rock scorpions | 12 | Species | Taxom |
| Hermanniellidae Grandjean, 1934 | | 20 | Species | Taxom |
| Hermanniidae Sellnick, 1928 | | 22 | Species | Taxom |
| Heterochthoniidae (Grandjean, 1954) | | 6 | Species | Taxom |
| Histiostomatidae Berlese, 1897 | | 155 | Species | Taxom |
| Homocaligidae Wood, 1969 | | 3 | Species | Taxom |
| Hubbardiidae Cook, 1899 | Hubbardiid shorttailed whipscorpions | 6 | Species | Taxom |
| Humerobatidae Grandjean, 1970 | | 24 | Species | Taxom |
| Hungarobelbidae (Miko & Travé, 1996) | | 11 | Species | Taxom |
| Hyadesiidae Halbert, 1915 | | 6 | Species | Taxom |
| Hydrozetidae Grandjean, 1954 | | 8 | Species | Taxom |
| Hydryphantidae Piersig, 1896 | | 2 | Species | Taxom |
| Hypochthoniidae Berlese, 1910 | | 7 | Species | Taxom |
| Ideoroncidae Chamberlin, 1930 | | 6 | Species | Taxom |
| Iuridae Thorell, 1876 | Largetooth scorpions | 14 | Species | Taxom |
| Ixodidae C. L. Koch, 1844 | Hard Tick | 77 | Species | Taxom |
| Karschiidae Walter, 1889 | | 32 | Species | Taxom |
| Kodiakellidae Hammer, 1967 | | 1 | Species | Taxom |
| Labidostommatidae Oudemans, 1904 | | 24 | Species | Taxom |
| Laelapidae Berlese, 1892 | | 4 | Species | Taxom |
| Lamellareidae Balogh, 1972 | | 1 | Species | Taxom |
| Larcidae Harvey, 1992 | | 6 | Species | Taxom |
| Leeuwenhoekiidae Womersley, 1944 | Chigger mites | 73 | Species | Taxom |
| Liacaridae Sellnick, 1928 | | 69 | Species | Taxom |
| Licneremaeidae Grandjean, 1931 | | 5 | Species | Taxom |
| Licnobelbidae (Grandjean, 1965) | | 3 | Species | Taxom |
| Licnodamaeidae (Grandjean, 1954) | | 21 | Species | Taxom |
| Liebstadiidae J. & P. Balogh, 1984 | | 14 | Species | Taxom |
| Limnocharidae Grube, 1859 | | 1 | Species | Taxom |
| Limnozetidae Thor, 1937 | | 8 | Species | Taxom |
| Lohmanniidae Berlese, 1916 | | 31 | Species | Taxom |
| Lycosidae Lehtinen & H..., 1979 | Ground Spiders | 509 | Species | Taxom |
| Machuellidae Balogh, 1983 | | 5 | Species | Taxom |
| Macronyssidae Oudemans, 1936 | Macronyssid Mites | 45 | Species | Taxom |
| Malaconothridae Berlese, 1916 | | 27 | Species | Taxom |
| Melicharidae (Hirschmann, 1962) | | 75 | Species | Taxom |
| Menthidae J.C. Chamberlin, 1930 | | 4 | Species | Taxom |
| Mesoplophoridae Ewing, 1917 | | 6 | Species | Taxom |
| Micreremidae Grandjean, 1954 | | 1 | Species | Taxom |
| Micropsammidae Coineau & Th..., 1983 | | 1 | Species | Taxom |
| Microtegeidae Balogh, 1972 | | 2 | Species | Taxom |
| Microzetidae Grandjean, 1936 | | 37 | Species | Taxom |
| Mimetidae Simon, 1881 | Pirate spider | 13 | Species | Taxom |
| Mochlozetidae Grandjean, 1960 | | 8 | Species | Taxom |
| Nanhermanniidae Sellnick, 1928 | | 17 | Species | Taxom |
| Nanohystricidae Norton & Fua..., 2015 | | 1 | Species | Taxom |
| Nanorchestidae Luxton, 1984 | | 14 | Species | Taxom |
| Nematalycidae Strenzke, 1954 | | 4 | Species | Taxom |
| Neobisiidae Chamberlin, 1930 | | 506 | Species | Taxom |
| Neoliodidae (Sellnick, 1928) | | 12 | Species | Taxom |
| Niphocepheidae Travé, 1959 | | 4 | Species | Taxom |
| Nippobodidae Aoki, 1959 | | 2 | Species | Taxom |
| Nodocepheidae Piffl, 1972 | | 1 | Species | Taxom |
| Nosybeidae Mahunka, 1993 | | 1 | Species | Taxom |
| Nothridae Berlese, 1896 | | 21 | Species | Taxom |
| Oehserchestidae Kethley, 1977 | | 1 | Species | Taxom |
| Ologamasidae Ryke, 1962 | | 68 | Species | Taxom |
| Olpiidae Banks, 1895 | | 51 | Species | Taxom |
| Opilioacaridae With, 1902 | | 8 | Species | Taxom |
| Oppiidae Sellnick, 1937 | | 367 | Species | Taxom |
| Oribatellidae Jacot, 1925 | | 80 | Species | Taxom |
| Oribatulidae Thor, 1929 | | 82 | Species | Taxom |
| Oribellidae (Kunst, 1971) | | 35 | Species | Taxom |
| Oribotritiidae Grandjean, 1954 | | 37 | Species | Taxom |
| Oripodidae Jacot, 1925 | | 8 | Species | Taxom |
| Otocepheidae Balogh, 1961 | | 16 | Species | Taxom |
| Pachylaelapidae Berlese, 1913 | | 161 | Species | Taxom |
| Palaeacaridae Grandjean, 1932 | | 6 | Species | Taxom |
| Palaeoeuscorpiidae Lourenço, 2003 | | 1 | Species | Taxom |
| Parakalummidae Grandjean, 1936 | | 15 | Species | Taxom |
| Paratydeidae Baker, 1949 | | 10 | Species | Taxom |
| Parholaspididae Evans, 1956 | | 29 | Species | Taxom |
| Parhypochthoniidae Grandjean, 1932 | | 2 | Species | Taxom |
| Passalozetidae Grandjean, 1954 | | 33 | Species | Taxom |
| Pediculochelidae Lavoipierre, 1946 | | 2 | Species | Taxom |
| Peloppiidae Balogh, 1943 | | 4 | Species | Taxom |
| Penthaleidae Oudemans, 1931 | Earth Mites | 16 | Species | Taxom |
| Penthalodidae Strandtmann, 1964 | | 6 | Species | Taxom |
| Perlohmanniidae Grandjean, 1954 | | 9 | Species | Taxom |
| Phalangiidae Latreille, 1802 | Daddy-Long-Legs | 5 | Species | Taxom |
| Phenopelopidae Petrunkevitch, 1955 | | 48 | Species | Taxom |
| Pholcidae C. L. Koch, 1851 | Carpenter spider | 93 | Species | Taxom |
| Phrynichidae Simon, 1892 | | 6 | Species | Taxom |
| Phthiracaridae Perty, 1841 | | 151 | Species | Taxom |
| Pisauridae Simon, 1890 | Big wolf spider | 18 | Species | Taxom |
| Plasmobatidae Grandjean, 1961 | | 1 | Species | Taxom |
| Plateremaeidae Trägårdh, 1931 | | 6 | Species | Taxom |
| Platyameridae Balogh & Balogh, 1983 | | 1 | Species | Taxom |
| Podocinidae Berlese, 1913 | | 4 | Species | Taxom |
| Podopterotegaeidae (Piffl, 1972) | | 2 | Species | Taxom |
| Polypterozetidae Grandjean, 1959 | | 1 | Species | Taxom |
| Protoplophoridae (Ewing, 1917) | | 12 | Species | Taxom |
| Protoribatidae J. & P. Balogh, 1984 | | 18 | Species | Taxom |
| Pseudochactidae Gromov, 1998 | | 3 | Species | Taxom |
| Pseudocheylidae Oudemans, 1909 | | 8 | Species | Taxom |
| Pseudoppiidae (Mahunka, 1975) | | 3 | Species | Taxom |
| Psorergatidae Womersley, 1941 | | 34 | Species | Taxom |
| Punctoribatidae Thor, 1937 | | 62 | Species | Taxom |
| Quadroppiidae Balogh, 1983 | | 21 | Species | Taxom |
| Raillietiidae Vitzthum, 1943 | | 2 | Species | Taxom |
| Raphignathidae Kramer, 1877 | | 53 | Species | Taxom |
| Rhagidiidae Zacharda, 1980 | | 94 | Species | Taxom |
| Rhagodidae Pocock, 1897 | | 45 | Species | Taxom |
| Rhinonyssidae Trouessart, 1895 | | 161 | Species | Taxom |
| Rhodacaridae Oudemans, 1902 | | 41 | Species | Taxom |
| Salticidae Blackwall, 1842 | Jumping Spider | 751 | Species | Taxom |
| Scheloribatidae Jacot, 1935 | | 61 | Species | Taxom |
| Scorpionidae Pierre André..., 1802 | Largeclaw scorpions | 22 | Species | Taxom |
| Scutoverticidae Grandjean, 1954 | | 40 | Species | Taxom |
| Selenoribatidae Schuster, 1963 | | 2 | Species | Taxom |
| Smarididae Kramer, 1878 | | 16 | Species | Taxom |
| Solpugidae Leach, 1815 | | 4 | Species | Taxom |
| Sparassidae Bertkau, 1872 | Giant crab spiders | 53 | Species | Taxom |
| Sphaerochthoniidae Grandjean, 1947 | | 6 | Species | Taxom |
| Spinozetidae Balogh, 1972 | | 3 | Species | Taxom |
| Spinturnicidae Oudemans, 1902 | | 20 | Species | Taxom |
| Stigmaeidae Wood, 1967 | | 323 | Species | Taxom |
| Stigmocheylidae (Kethley, 1990) | | 2 | Species | Taxom |
| Strandtmanniidae M. Zacharda, 1979 | | 1 | Species | Taxom |
| Suctobelbidae Jacot, 1938 | | 90 | Species | Taxom |
| Syarinidae Chamberlin, 1930 | | 18 | Species | Taxom |
| Synichotritiidae Walker, 1965 | | 1 | Species | Taxom |
| Syringophilidae Lavoipierre, 1953 | Quill mites | 137 | Species | Taxom |
| Taracidae Schönhofer, 2013 | | 1 | Species | Taxom |
| Tectocepheidae Grandjean, 1954 | | 6 | Species | Taxom |
| Tegeocranellidae P. Balogh, 1987 | | 2 | Species | Taxom |
| Tegoribatidae Grandjean, 1954 | | 18 | Species | Taxom |
| Teneriffiidae Thor, 1911 | | 10 | Species | Taxom |
| Tenuialidae Jacot, 1929 | | 9 | Species | Taxom |
| Tenuipalpidae Berlese, 1913 | False spider mites | 179 | Species | Taxom |
| Terpnacaridae Grandjean, 1939 | | 3 | Species | Taxom |
| Tetranychidae Donnadieu, 1875 | Spider mites | 1 | Species | Taxom |
| Thelyphonidae Lucas, 1835 | | 1 | Species | Taxom |
| Theraphosidae Thorell, 1870 | Bird-eating spiders | 11 | Species | Taxom |
| Theridiidae Sundevall, 1833 | Cobweb And Widow Spiders | 316 | Species | Taxom |
| Thomisidae Sundevall, 1833 | Crab Spider | 1 | Species | Taxom |
| Thyrisomidae Grandjean, 1953 | | 8 | Species | Taxom |
| Tokunocepheidae Aoki, 1966 | | 1 | Species | Taxom |
| Trhypochthoniidae Willmann, 1931 | | 17 | Species | Taxom |
| Trichthoniidae (Lee, 1982) | | 1 | Species | Taxom |
| Trizetidae Ewing, 1917 | | 1 | Species | Taxom |
| Trombiculidae Ewing, 1929 | Chigger mites | 654 | Species | Taxom |
| Unduloribatidae Kunst, 1971 | | 5 | Species | Taxom |
| Unguicheylidae Khaustov Vor..., 2023 | | 1 | Species | Taxom |
| Unionicolidae Oudemans, 1909 | | 1 | Species | Taxom |
| Varroidae Delfinado & ..., 1974 | | 1 | Species | Taxom |
| Winterschmidtiidae Oudemans, 1923 | | 65 | Species | Taxom |
| Withiidae Chamberlin, 1931 | | 10 | Species | Taxom |
| Xenillidae Woolley & Hi..., 1966 | | 25 | Species | Taxom |
| Zetomotrichidae Grandjean, 1934 | | 16 | Species | Taxom |
| Zetorchestidae Michael, 1898 | | 16 | Species | Taxom |