All families

100 families:

Araneae

Agelenidae C. L. Koch, 1837 valid (185 species)
Amaurobiidae Thorell, 1870 valid (38 species)
Anapidae Simon, 1895 valid (5 species)
Anyphaenidae Bertkau, 1878 valid (6 species)
Araneidae Simon, 1895 valid (124 species)
Atypidae Thorell, 1870 valid (4 species)
Cithaeronidae O. P.-Cambridge, 1872 valid (1 species)
Clubionidae Wagner, 1887 valid (47 species)
Corinnidae Karsch, 1880 valid (1 species)
Ctenidae Keyserling, 1877 valid (1 species)
Ctenizidae Thorell, 1887 valid (8 species)
Cybaeidae Banks, 1892 valid (21 species)
Cyrtaucheniidae Simon, 1889 valid (4 species)
Desidae Pocock, 1895 valid (1 species)
Dictynidae O. P.-Cambridge, 1871 valid (62 species)
Dysderidae O. P.-Cambridge, 1871 valid (296 species)
Eresidae C. L. Koch, 1850 valid (19 species)
Eutichuridae Lehtinen, 1967 valid (31 species)
Filistatidae Ausserer, 1867 valid (12 species)
Gnaphosidae Pocock, 1898 valid (425 species)
Hahniidae Bertkau, 1878 valid (26 species)
Hersiliidae Thorell, 1870 valid (3 species)
Hexathelidae Simon, 1892 valid (2 species)
Leptonetidae Simon, 1890 valid (66 species)
Linyphiidae Blackwall, 1859 valid (1252 species)
Liocranidae Simon, 1897 valid (53 species)
Lycosidae Sundevall, 1833 valid (281 species)
Mimetidae Simon, 1881 valid (11 species)
Miturgidae Simon, 1886 valid (12 species)
Mysmenidae Petrunkevitch, 1928 valid (4 species)
Nemesiidae Simon, 1889 valid (68 species)
Nesticidae Simon, 1894 valid (51 species)
Ochyroceratidae Fage, 1912 valid (1 species)
Oecobiidae Blackwall, 1862 valid (10 species)
Oonopidae Simon, 1890 valid (37 species)
Oxyopidae Thorell, 1870 valid (14 species)
Palpimanidae Thorell, 1870 valid (4 species)
Philodromidae Thorell, 1870 valid (92 species)
Pholcidae C. L. Koch, 1850 valid (49 species)
Phrurolithidae Banks, 1892 valid (13 species)
Phyxelididae Lehtinen, 1967 valid (1 species)
Pimoidae Wunderlich, 1986 valid (4 species)
Pisauridae Simon, 1890 valid (7 species)
Prodidomidae Simon, 1884 valid (5 species)
Salticidae Blackwall, 1841 valid (348 species)
Scytodidae Blackwall, 1864 valid (8 species)
Segestriidae Simon, 1893 valid (18 species)
Selenopidae Simon, 1897 valid (1 species)
Sicariidae Keyserling, 1880 valid (2 species)
Sparassidae Bertkau, 1872 valid (14 species)
Symphytognathidae Hickman, 1931 valid (1 species)
Synaphridae Wunderlich, 1986 valid (4 species)
Telemidae Fage, 1913 valid (1 species)
Tetragnathidae Menge, 1866 valid (32 species)
Theraphosidae Thorell, 1869 valid (3 species)
Theridiidae Sundevall, 1833 valid (226 species)
Theridiosomatidae Simon, 1881 valid (1 species)
Thomisidae Sundevall, 1833 valid (171 species)
Titanoecidae Lehtinen, 1967 valid (17 species)
Trachelidae Simon, 1897 valid (8 species)
Uloboridae Thorell, 1869 valid (9 species)
Zodariidae Thorell, 1881 valid (112 species)
Zoropsidae Bertkau, 1882 valid (6 species)

Opiliones

Cladonychiidae Hadži, 1935 valid (5 species)
Dicranolasmatidae Sørensen, 1873 valid (14 species)
Ischyropsalididae Simon, 1879 valid (24 species)
Nemastomatidae Simon, 1872 valid (104 species)
Phalangiidae Latreille, 1802 valid (97 species)
Phalangodidae Simon, 1879 valid (14 species)
Sabaconidae Desco, 1970 valid (8 species)
Sclerosomatidae Simon, 1879 valid (55 species)
Sironidae Simon, 1879 valid (33 species)
Travuniidae Absolon & Kratochvíl, 1932 valid (15 species)
Trogulidae Sundevall, 1833 valid (58 species)

Pseudoscorpiones

Atemnidae Kishida, 1929 valid (7 species)
Bochicidae Chamberlin, 1930 valid (2 species)
Cheiridiidae Hansen, 1894 valid (3 species)
Cheliferidae Risso, 1826 valid (54 species)
Chernetidae Menge, 1855 valid (64 species)
Chthoniidae Daday, 1888 valid (254 species)
Garypidae Simon, 1879 valid (5 species)
Garypinidae Daday, 1888 valid (6 species)
Geogarypidae Chamberlin, 1930 valid (4 species)
Larcidae Harvey M. S., 1992 valid (6 species)
Neobisiidae Chamberlin, 1930 valid (495 species)
Olpiidae Banks, 1895 valid (20 species)
Pseudotyrannochthoniidae Beier, 1932 valid (1 species)
Syarinidae Chamberlin, 1930 valid (19 species)
Withiidae Chamberlin, 1931 valid (4 species)

Amblypygi

Charinidae Quintero, 1986 valid (1 species)

Solifugae

Daesiidae Kraepelin, 1899 valid (6 species)
Galeodidae Sundevall, 1833 valid (6 species)
Gylippidae Roewer, 1933 valid (2 species)
Karschiidae Kraepelin, 1899 valid (4 species)

Scorpiones

Buthidae Koch, 1837 valid (11 species)
Euscorpiidae Laurie, 1896 valid (45 species)
Iuridae Thorell, 1876 valid (9 species)
Troglotayosicidae Lourenço, 1998 valid (2 species)

Palpigradi

Eukoeneniidae Petrunkevitch, 1955 valid (40 species)

Schizomida

Hubbardiidae Cook, 1899 valid (4 species)