All families

104 families:

Araneae, True Spiders

Agelenidae C. L. Koch, 1837 accepted, Funnelweb spiders (244 species)
Amaurobiidae Thorell, 1870 accepted, Laceweb spiders (43 species)
Anapidae Simon, 1895 accepted (5 species)
Anyphaenidae Bertkau, 1878 accepted, Buzzing spiders (6 species)
Araneidae Clerck, 1757 accepted, Orbweb spiders (112 species)
Atypidae Thorell, 1870 accepted, Purseweb spiders (4 species)
Cheiracanthiidae Wagner, 1887 accepted (36 species)
Cithaeronidae Simon, 1893 accepted (2 species)
Clubionidae Wagner, 1887 accepted, Sac spiders (51 species)
Corinnidae Karsch, 1880 accepted, Ant-like sac spiders (6 species)
Ctenidae Keyserling, 1877 accepted (5 species)
Ctenizidae Thorell, 1887 accepted (5 species)
Cybaeidae Banks, 1892 accepted, Soft spiders (27 species)
Cyrtaucheniidae Simon, 1889 accepted (13 species)
Desidae Pocock, 1895 accepted (1 species)
Dictynidae O. Pickard-Cambridge, 1871 accepted, Meshweb spiders (72 species)
Dysderidae C. L. Koch, 1837 accepted, Woodlouse spiders (427 species)
Eresidae C. L. Koch, 1850 accepted, Velvet spiders (35 species)
Filistatidae Simon, 1864 accepted (19 species)
Gnaphosidae Banks, 1892 accepted, Ground spiders (584 species)
Hahniidae Bertkau, 1878 accepted, Lesser cobweb spiders (31 species)
Halonoproctidae Pocock, 1901 accepted (4 species)
Hersiliidae Thorell, 1869 accepted (6 species)
Idiopidae Simon, 1889 accepted (1 species)
Leptonetidae Simon, 1890 accepted (72 species)
Linyphiidae Blackwall, 1859 accepted, Money spiders (1,398 species)
Liocranidae Simon, 1897 accepted, Running foliage spiders (66 species)
Lycosidae Sundevall, 1833 accepted, Wolf spiders (365 species)
Macrothelidae Simon, 1892 accepted (3 species)
Mimetidae Simon, 1881 accepted, Pirate spiders (10 species)
Miturgidae Simon, 1886 accepted (12 species)
Mysmenidae Petrunkevitch, 1928 accepted, Dwarf cobweb spiders (4 species)
Nemesiidae Simon, 1889 accepted (91 species)
Nesticidae Simon, 1894 accepted, Comb-footed cellar spiders (57 species)
Ochyroceratidae Fage, 1912 accepted (1 species)
Oecobiidae Blackwall, 1862 accepted, Discweb spiders (16 species)
Oonopidae Simon, 1890 accepted, Goblin spiders (52 species)
Oxyopidae Thorell, 1869 accepted, Lynx spiders (17 species)
Palpimanidae Thorell, 1870 accepted (11 species)
Philodromidae Thorell, 1870 accepted, Running crab spiders (117 species)
Pholcidae C. L. Koch, 1850 accepted, Cellar spiders (67 species)
Phrurolithidae Banks, 1892 accepted (15 species)
Phyxelididae Lehtinen, 1967 accepted (1 species)
Pimoidae Wunderlich, 1986 accepted (4 species)
Pisauridae Simon, 1890 accepted, Nurseryweb spiders (9 species)
Salticidae Blackwall, 1841 accepted, Jumping spiders (458 species)
Scytodidae Blackwall, 1864 accepted, Spitting spiders (12 species)
Segestriidae Simon, 1893 accepted, Tubeweb spiders (18 species)
Selenopidae Simon, 1897 accepted (2 species)
Sicariidae Keyserling, 1880 accepted (4 species)
Sparassidae Bertkau, 1872 accepted, Huntsman spiders (39 species)
Symphytognathidae Hickman, 1931 accepted (1 species)
Synaphridae Wunderlich, 1986 accepted (5 species)
Telemidae Fage, 1913 accepted (1 species)
Tetragnathidae Menge, 1866 accepted, Long-jawed orbweb spiders (38 species)
Theraphosidae Thorell, 1869 accepted (10 species)
Theridiidae Sundevall, 1833 accepted, Comb-footed spiders (265 species)
Theridiosomatidae Simon, 1881 accepted, Ray's spiders (1 species)
Thomisidae Sundevall, 1833 accepted, Crab spiders (216 species)
Titanoecidae Lehtinen, 1967 accepted (20 species)
Trachelidae Simon, 1897 accepted (10 species)
Uloboridae Thorell, 1869 accepted, Cribellate orbweb spiders (9 species)
Zodariidae Thorell, 1881 accepted, Ant-hunting spiders (171 species)
Zoropsidae Bertkau, 1882 accepted, False wolf spiders (10 species)

Opiliones, Harvestmen

Buemarinoidae Karaman, 2019 accepted (2 species)
Cladonychiidae Hadži, 1935 accepted (8 species)
Dicranolasmatidae Sørensen, 1873 accepted (14 species)
Ischyropsalididae Simon, 1879 accepted (24 species)
Nemastomatidae Simon, 1872 accepted (106 species)
Phalangiidae Latreille, 1802 accepted (102 species)
Phalangodidae Simon, 1879 accepted (13 species)
Sabaconidae Dresco, 1970 accepted (9 species)
Sclerosomatidae Simon, 1879 accepted (53 species)
Sironidae Simon, 1879 accepted (33 species)
Travuniidae Absolon & Kratochvíl, 1932 accepted (15 species)
Trogulidae Sundevall, 1833 accepted (60 species)

Pseudoscorpiones, False Scorpions

Atemnidae Kishida, 1929 accepted (6 species)
Bochicidae Chamberlin, 1930 accepted (2 species)
Cheiridiidae Hansen, 1894 accepted (3 species)
Cheliferidae Risso, 1826 accepted (61 species)
Chernetidae Menge, 1855 accepted (65 species)
Chthoniidae Daday, 1889 accepted (339 species)
Garypidae Simon, 1879 accepted (5 species)
Garypinidae Daday, 1888 accepted (10 species)
Geogarypidae Chamberlin, 1930 accepted (6 species)
Larcidae Harvey M. S., 1992 accepted (6 species)
Neobisiidae Chamberlin, 1930 accepted (543 species)
Olpiidae Banks, 1895 accepted (30 species)
Pseudotyrannochthoniidae Beier, 1932 accepted (1 species)
Syarinidae Chamberlin, 1930 accepted (21 species)
Withiidae Chamberlin, 1931 accepted (6 species)

Amblypygi, Whip Spiders

Charinidae Quintero, 1986 accepted (1 species)
Phrynichidae Simon, 1892 accepted (1 species)

Solifugae, Camel Spiders

Daesiidae Kraepelin, 1899 accepted (6 species)
Galeodidae Sundevall, 1833 accepted (7 species)
Gylippidae Roewer, 1933 accepted (2 species)
Karschiidae Kraepelin, 1899 accepted (4 species)

Scorpiones, Scorpions

Belisariidae Lourenço, 1998 accepted (3 species)
Buthidae C. L. Koch, 1837 accepted (87 species)
Euscorpiidae Laurie, 1896 accepted (98 species)
Iuridae Thorell, 1876 accepted (12 species)
Scorpionidae Latreille, 1802 accepted (1 species)

Palpigradi, Microwhip Scorpions

Eukoeneniidae Petrunkevitch, 1955 accepted (44 species)

Schizomida, Shorttailed Whipscorpions

Hubbardiidae Cook, 1899 accepted (4 species)