All families

102 families:

Araneae

Funnelweb spiders, Agelenidae C. L. Koch, 1837 valid (247 species)
Laceweb spiders, Amaurobiidae Thorell, 1870 valid (42 species)
Anapidae Simon, 1895 valid (5 species)
Buzzing spiders, Anyphaenidae Bertkau, 1878 valid (6 species)
Orbweb spiders, Araneidae Clerck, 1757 valid (145 species)
Purseweb spiders, Atypidae Thorell, 1870 valid (4 species)
Cheiracanthiidae Wagner, 1887 valid (39 species)
Cithaeronidae O. Pickard-Cambridge, 1872 valid (2 species)
Sac spiders, Clubionidae Wagner, 1887 valid (54 species)
Ant-like sac spiders, Corinnidae Karsch, 1880 valid (6 species)
Ctenidae Keyserling, 1877 valid (2 species)
Ctenizidae Thorell, 1887 valid (6 species)
Soft spiders, Cybaeidae Banks, 1892 valid (26 species)
Cyrtaucheniidae Simon, 1889 valid (17 species)
Desidae Pocock, 1895 valid (1 species)
Meshweb spiders, Dictynidae O. Pickard-Cambridge, 1871 valid (72 species)
Woodlouse spiders, Dysderidae O. Pickard-Cambridge, 1871 valid (407 species)
Velvet spiders, Eresidae C. L. Koch, 1850 valid (32 species)
Filistatidae Simon, 1864 valid (17 species)
Ground spiders, Gnaphosidae Pocock, 1898 valid (597 species)
Lesser cobweb spiders, Hahniidae Bertkau, 1878 valid (31 species)
Halonoproctidae Pocock, 1901 valid (4 species)
Hersiliidae Thorell, 1870 valid (6 species)
Idiopidae Simon, 1889 valid (1 species)
Leptonetidae Simon, 1890 valid (72 species)
Money spiders, Linyphiidae Blackwall, 1859 valid (1,432 species)
Running foliage spiders, Liocranidae Simon, 1897 valid (62 species)
Wolf spiders, Lycosidae Sundevall, 1833 valid (394 species)
Macrothelidae Simon, 1892 valid (3 species)
Pirate spiders, Mimetidae Simon, 1881 valid (11 species)
Miturgidae Simon, 1886 valid (12 species)
Dwarf cobweb spiders, Mysmenidae Petrunkevitch, 1928 valid (4 species)
Nemesiidae Simon, 1889 valid (81 species)
Comb-footed cellar spiders, Nesticidae Simon, 1894 valid (56 species)
Ochyroceratidae Fage, 1912 valid (1 species)
Discweb spiders, Oecobiidae Blackwall, 1862 valid (16 species)
Goblin spiders, Oonopidae Simon, 1890 valid (51 species)
Lynx spiders, Oxyopidae Thorell, 1870 valid (18 species)
Palpimanidae Thorell, 1870 valid (10 species)
Running crab spiders, Philodromidae Thorell, 1870 valid (117 species)
Cellar spiders, Pholcidae C. L. Koch, 1850 valid (56 species)
Phrurolithidae Banks, 1892 valid (13 species)
Phyxelididae Lehtinen, 1967 valid (1 species)
Pimoidae Wunderlich, 1986 valid (4 species)
Nurseryweb spiders, Pisauridae Simon, 1890 valid (9 species)
Jumping spiders, Salticidae Blackwall, 1841 valid (484 species)
Spitting spiders, Scytodidae Blackwall, 1864 valid (12 species)
Tubeweb spiders, Segestriidae Simon, 1893 valid (18 species)
Selenopidae Simon, 1897 valid (1 species)
Sicariidae Keyserling, 1880 valid (2 species)
Huntsman spiders, Sparassidae Bertkau, 1872 valid (39 species)
Symphytognathidae Hickman, 1931 valid (1 species)
Synaphridae Wunderlich, 1986 valid (5 species)
Telemidae Fage, 1913 valid (1 species)
Long-jawed orbweb spiders, Tetragnathidae Menge, 1866 valid (36 species)
Theraphosidae Thorell, 1869 valid (10 species)
Comb-footed spiders, Theridiidae Sundevall, 1833 valid (263 species)
Ray's spiders, Theridiosomatidae Simon, 1881 valid (1 species)
Crab spiders, Thomisidae Sundevall, 1833 valid (223 species)
Titanoecidae Lehtinen, 1967 valid (19 species)
Trachelidae Simon, 1897 valid (10 species)
Cribellate orbweb spiders, Uloboridae Thorell, 1869 valid (10 species)
Ant-hunting spiders, Zodariidae Thorell, 1881 valid (135 species)
False wolf spiders, Zoropsidae Bertkau, 1882 valid (10 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 (99 species)
Phalangodidae Simon, 1879 valid (14 species)
Sabaconidae Desco, 1970 valid (8 species)
Sclerosomatidae Simon, 1879 valid (56 species)
Sironidae Simon, 1879 valid (33 species)
Travuniidae Absolon & Kratochvíl, 1932 valid (16 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, 1889 valid (320 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 (499 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)
Phrynichidae Simon, 1892 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 C. L. Koch, 1837 valid (12 species)
Euscorpiidae Laurie, 1896 valid (63 species)
Iuridae Thorell, 1876 valid (9 species)
Troglotayosicidae Lourenço, 1998 valid (2 species)

Palpigradi

Eukoeneniidae Petrunkevitch, 1955 valid (43 species)

Schizomida

Hubbardiidae Cook, 1899 valid (4 species)