| Acanthoscorpionidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Agoristenidae Silhavy, 1973 | | 63 | Species | Taxom |
| Akravidae Levy, 2007 | | 1 | Species | Taxom |
| Allobuthiscorpiidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Allopalaeophonidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Ammotrechidae Roewer, 1934 | Curve-faced solifugid | 120 | Species | Taxom |
| Archaeobuthidae Lourenço, 2001 | | 1 | Species | Taxom |
| Archaeoctonidae (Petrunkevitch, 1949) | | 2 | Species | Taxom |
| Askawachidae Kury & Carvalho, 2020 | | 1 | Species | Taxom |
| Assamiidae Sørensen, 1884 | | 424 | Species | Taxom |
| Atemnidae Chamberlin, 1931 | | 207 | Species | Taxom |
| Belisariidae Lourenço, 1998 | | 1 | Species | Taxom |
| Biantidae Thorell, 1889 | | 121 | Species | Taxom |
| Bochicidae Chamberlin, 1930 | | 45 | Species | Taxom |
| Bothriuridae Simon, 1880 | | 197 | Species | Taxom |
| Branchioscorpionidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Buthidae C. L. Koch, 1837 | Arrowbreasted scorpions | 1721 | Species | Taxom |
| Caddidae Banks, 1892 | | 25 | Species | Taxom |
| Caraboctonidae Kraepelin, 1905 | | 26 | Species | Taxom |
| Centromachidae Petrunkevitch, 1953 | | 5 | Species | Taxom |
| Ceromidae Purcell, 1903 | | 22 | Species | Taxom |
| Chactidae Reginald Inn..., 1893 | Fatclaw scorpions | 265 | Species | Taxom |
| Chaerilidae Pocock, 1893 | | 60 | Species | Taxom |
| Chaerilobuthidae Lourenço & B..., 2011 | | 11 | Species | Taxom |
| Cheiridiidae Hansen, 1893 | | 88 | Species | Taxom |
| Cheliferidae Risso, 1826 | | 515 | Species | Taxom |
| Chernetidae Menge, 1855 | | 798 | Species | Taxom |
| Chthoniidae Daday, 1888 | | 1115 | Species | Taxom |
| Cladonychiidae (Hadži, 1935) | | 1 | Species | Taxom |
| Cosmetidae C. L. Koch, 1839 | | 767 | Species | Taxom |
| Cranaidae Roewer, 1913 | | 24 | Species | Taxom |
| Cryptogeobiidae Kury, 2014 | | 33 | Species | Taxom |
| Curculioididae Cockerell, 1916 | | 14 | Species | Taxom |
| Cyclophthalmidae Thorell & Li..., 1885 | | 5 | Species | Taxom |
| Daesiidae Kraepelin, 1899 | | 214 | Species | Taxom |
| Dicranolasmatidae Simon, 1879 | | 22 | Species | Taxom |
| Diplocentridae Karsch, 1880 | Spinysting scorpions | 4 | Species | Taxom |
| Dolichophonidae Petrunkevitch, 1953 | | 1 | Species | Taxom |
| Dracochelidae Schawaller, ..., 1991 | | 1 | Species | Taxom |
| Eobuthidae Kjellesvig-W..., 1986 | | 4 | Species | Taxom |
| Eoscorpiidae Scudder, 1884 | | 17 | Species | Taxom |
| Eotrogulidae Petrunkevitch, 1955 | | 1 | Species | Taxom |
| Epedanidae Sørensen, 1886 | | 185 | Species | Taxom |
| Eremobatidae Kraepelin, 1899 | | 229 | Species | Taxom |
| Escadabiidae Kury & Pérez, 2003 | | 9 | Species | Taxom |
| Euscorpiidae Laurie, 1896 | Shorttail scorpions | 274 | Species | Taxom |
| Feaellidae Ellingsen, 1906 | | 20 | Species | Taxom |
| Fissiphalliidae (Martens, 1988) | | 6 | Species | Taxom |
| Galeodidae Sundevall, 1833 | | 233 | Species | Taxom |
| Gallioscorpionidae Lourenço & G..., 2004 | | 1 | Species | Taxom |
| Garnettiidae Dubinin, 1962 | | 1 | Species | Taxom |
| Garypidae Simon, 1879 | | 123 | Species | Taxom |
| Garypinidae Daday, 1888 | | 93 | Species | Taxom |
| Geogarypidae Chamberlin, 1930 | | 98 | Species | Taxom |
| Gigantoscorpionidae Kjellesvig-W..., 1986 | | 2 | Species | Taxom |
| Gonyleptidae Sundevall, 1833 | | 1081 | Species | Taxom |
| Guasiniidae Gonzalez-Sponga, 1997 | | 3 | Species | Taxom |
| Gylippidae Lawrence, 1968 | | 26 | Species | Taxom |
| Gymnobisiidae Beier, 1947 | | 14 | Species | Taxom |
| Hadruridae Stahnke, 1974 | | 14 | Species | Taxom |
| Heloscorpionidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Hemiscorpiidae Pocock, 1893 | Longtail rock scorpions | 22 | Species | Taxom |
| Hesperolpiidae Chamberlin, 1930 | | 59 | Species | Taxom |
| Hexisopodidae Karsch, 1879 | | 26 | Species | Taxom |
| Hormuridae Laurie, 1896 | | 122 | Species | Taxom |
| Hyidae Chamberlin, 1930 | | 16 | Species | Taxom |
| Icaleptidae Kury & Pérez, 2002 | | 2 | Species | Taxom |
| Ideoroncidae Chamberlin, 1930 | | 102 | Species | Taxom |
| Ischyropsalididae Simon, 1879 | | 72 | Species | Taxom |
| Isobuthidae Petrunkevitch, 1913 | | 7 | Species | Taxom |
| Iuridae Thorell, 1876 | Largetooth scorpions | 18 | Species | Taxom |
| Karschiidae Walter, 1889 | | 49 | Species | Taxom |
| Kimulidae Pérez Gonzal..., 2007 | | 34 | Species | Taxom |
| Kronoscorpionidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Kustarachnidae Petrunkevitch, 1949 | | 2 | Species | Taxom |
| Labriscorpionidae (Kjellesvig-W..., 1986) | | 1 | Species | Taxom |
| Larcidae Harvey, 1992 | | 22 | Species | Taxom |
| Liochelidae (Fet & Bechley, 2001) | Rockloving scorpions | 6 | Species | Taxom |
| Lipophagidae Wharton, 1981 | | 9 | Species | Taxom |
| Loboarchaeoctonidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Mazoniidae Petrunkevitch, 1913 | | 4 | Species | Taxom |
| Melanoblossiidae Roewer, 1941 | | 17 | Species | Taxom |
| Menthidae J.C. Chamberlin, 1930 | | 12 | Species | Taxom |
| Mesophonidae Wills, 1910 | | 4 | Species | Taxom |
| Microlabiidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Monoscutidae (Forster, 1948) | | 27 | Species | Taxom |
| Mummuciidae Mello-Leitão, 1938 | | 39 | Species | Taxom |
| Nemastomatidae Simon, 1872 | | 264 | Species | Taxom |
| Nemastomoididae Petrunkevitch, 1955 | | 4 | Species | Taxom |
| Neobisiidae Chamberlin, 1930 | | 755 | Species | Taxom |
| Neogoveidae Shear, 1980 | | 23 | Species | Taxom |
| Neopilionidae Lawrence, 1931 | | 68 | Species | Taxom |
| Nipponopsalididae Martens, 1976 | | 3 | Species | Taxom |
| Nomoclastidae Roewer, 1943 | | 18 | Species | Taxom |
| Ogoveidae Shear, 1980 | | 10 | Species | Taxom |
| Olpiidae Banks, 1895 | | 265 | Species | Taxom |
| Oncopodidae (Thorell, 1876) | | 11 | Species | Taxom |
| Opsieobuthidae (Kjellesvig-W..., 1986) | | 2 | Species | Taxom |
| Palaeoburmesebuthidae Lourenço, 2015 | | 15 | Species | Taxom |
| Palaeobuthidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Palaeoeuscorpiidae Lourenço, 2003 | | 3 | Species | Taxom |
| Palaeophonidae Thorell & Li..., 1885 | | 6 | Species | Taxom |
| Palaeopisthacanthidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Palaeoscorpiidae Lehmann, 1944 | | 1 | Species | Taxom |
| Palaeotrilineatidae Lourenço, 2012 | | 1 | Species | Taxom |
| Parahyidae Harvey, 1992 | | 2 | Species | Taxom |
| Paraisobuthidae Kjellesvig-W..., 1986 | | 5 | Species | Taxom |
| Paranonychidae (Briggs, 1971) | | 25 | Species | Taxom |
| Pareobuthidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Pentanychidae Briggs, 1971 | | 5 | Species | Taxom |
| Petrobunidae Sharma & Gir..., 2011 | | 5 | Species | Taxom |
| Pettalidae Simon, 1879 | | 75 | Species | Taxom |
| Phalangiidae Latreille, 1802 | Daddy-Long-Legs | 539 | Species | Taxom |
| Phalangodidae Simon, 1879 | | 174 | Species | Taxom |
| Podoctidae Roewer, 1912 | | 142 | Species | Taxom |
| Poliocheridae Scudder, 1884 | | 7 | Species | Taxom |
| Praearcturidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Proscorpiidae Scudder, 1885 | | 7 | Species | Taxom |
| Protobuthidae Lourenço & G..., 2004 | | 2 | Species | Taxom |
| Protoischnuridae Carvalho & L..., 2001 | | 3 | Species | Taxom |
| Protosolpugidae Petrunkevitch, 1953 | | 1 | Species | Taxom |
| Pseudobuthiscorpiidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Pseudochactidae Gromov, 1998 | | 11 | Species | Taxom |
| Pseudochiridiidae Chamberlin, 1923 | | 15 | Species | Taxom |
| Pseudogarypidae J.C. Chamberlin, 1923 | | 13 | Species | Taxom |
| Pyramidopidae Starega, 1992 | | 39 | Species | Taxom |
| Rhagodidae Pocock, 1897 | | 117 | Species | Taxom |
| Ricinoididae Ewing, 1929 | Hooded tickspiders | 106 | Species | Taxom |
| Rugodentidae Bastawade, S..., 2005 | | 1 | Species | Taxom |
| Sabaconidae Dresco, 1970 | Sabaconid Harvestmen | 57 | Species | Taxom |
| Samoidae Sørensen, 1886 | | 59 | Species | Taxom |
| Sandokanidae Özdikmen & K..., 2007 | | 62 | Species | Taxom |
| Sclerosomatidae Simon, 1879 | Sclerosomatid Harvestmen | 1287 | Species | Taxom |
| Scoloposcorpionidae Kjellesvig-W..., 1986 | | 2 | Species | Taxom |
| Scorpionidae Pierre André..., 1802 | Largeclaw scorpions | 466 | Species | Taxom |
| Sironidae Simon, 1879 | | 61 | Species | Taxom |
| Solpugidae Leach, 1815 | | 261 | Species | Taxom |
| Spongiophonidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Stenoscorpionidae Kjellesvig-W..., 1986 | | 2 | Species | Taxom |
| Sternophoridae J.C. Chamberlin, 1923 | | 23 | Species | Taxom |
| Stoermeroscorpionidae (Kjellesvig-W..., 1986) | | 1 | Species | Taxom |
| Stygnidae Simon, 1879 | | 84 | Species | Taxom |
| Stygnommatidae Roewer, 1923 | | 29 | Species | Taxom |
| Stygnopsidae Sørensen, 1932 | | 29 | Species | Taxom |
| Stygophalangiidae Oudemans, 1933 | | 1 | Species | Taxom |
| Stylocellidae Hansen & Sör..., 1904 | | 38 | Species | Taxom |
| Sucinlourencoidae Rossi, 2015 | | 1 | Species | Taxom |
| Superstitioniidae Stahnke, 1940 | | 19 | Species | Taxom |
| Syarinidae Chamberlin, 1930 | | 134 | Species | Taxom |
| Synthetonychiidae (Forster, 1954) | | 14 | Species | Taxom |
| Taracidae Schönhofer, 2013 | | 32 | Species | Taxom |
| Telmatoscorpionidae Kjellesvig-W..., 1986 | | 3 | Species | Taxom |
| Travuniidae Absolon & Kr..., 1932 | | 62 | Species | Taxom |
| Triaenonychidae Sörensen, 1886 | | 494 | Species | Taxom |
| Tridenchthoniidae Balzan, 1892 | | 1 | Species | Taxom |
| Trionyxellidae Roewer, 1912 | | 26 | Species | Taxom |
| Troglosironidae Shear, 1993 | | 12 | Species | Taxom |
| Trogulidae Sundevall, 1833 | | 73 | Species | Taxom |
| Vaejovidae Thorell, 1876 | | 327 | Species | Taxom |
| Waterstoniidae Kjellesvig-W..., 1986 | | 3 | Species | Taxom |
| Willsiscorpionidae Kjellesvig-W..., 1986 | | 1 | Species | Taxom |
| Withiidae Chamberlin, 1931 | | 194 | Species | Taxom |
| Zalmoxidae (Sörensen, 1886) | | 241 | Species | Taxom |