All families

114 families:

Araneae, True Spiders

Agelenidae C. L. Koch, 1837 accepted, Funnelweb spiders (260 species)
Amaurobiidae Thorell, 1870 accepted, Laceweb spiders (45 species)
Anapidae Simon, 1895 accepted (5 species)
Anyphaenidae Bertkau, 1878 accepted, Buzzing spiders (9 species)
Araneidae Clerck, 1757 accepted, Orbweb spiders (119 species)
Atypidae Thorell, 1870 accepted, Purseweb spiders (4 species)
Cheiracanthiidae Wagner, 1887 accepted (38 species)
Cicurinidae F. O. Pickard-Cambridge, 1893 accepted (6 species)
Cithaeronidae Simon, 1893 accepted (2 species)
Clubionidae Simon, 1878 accepted, Sac spiders (54 species)
Corinnidae Karsch, 1880 accepted, Ant-like sac spiders (12 species)
Ctenidae Keyserling, 1877 accepted (12 species)
Ctenizidae Thorell, 1887 accepted (5 species)
Cybaeidae Banks, 1892 accepted, Soft spiders (26 species)
Cyrtaucheniidae Simon, 1889 accepted (14 species)
Desidae Pocock, 1895 accepted (6 species)
Dictynidae O. Pickard-Cambridge, 1871 accepted, Meshweb spiders (86 species)
Dipluridae Simon, 1889 accepted (1 species)
Dysderidae C. L. Koch, 1837 accepted, Woodlouse spiders (520 species)
Eresidae C. L. Koch, 1850 accepted, Velvet spiders (38 species)
Filistatidae Ausserer, 1867 accepted (20 species)
Fonteferridae Wunderlich, 2023 accepted (1 species)
Gnaphosidae Banks, 1892 accepted, Ground spiders (599 species)
Hahniidae Bertkau, 1878 accepted, Lesser cobweb spiders (23 species)
Halonoproctidae Pocock, 1901 accepted (4 species)
Hersiliidae Thorell, 1869 accepted (6 species)
Idiopidae Simon, 1889 accepted (1 species)
Ischnothelidae F. O. Pickard-Cambridge, 1897 accepted (1 species)
Leptonetidae Simon, 1890 accepted (76 species)
Linyphiidae Blackwall, 1859 accepted, Money spiders (1,403 species)
Liocranidae Simon, 1897 accepted, Running foliage spiders (73 species)
Lycosidae Sundevall, 1833 accepted, Wolf spiders (367 species)
Macrothelidae Simon, 1892 accepted (3 species)
Mimetidae Simon, 1881 accepted, Pirate spiders (10 species)
Miturgidae Simon, 1886 accepted, Prowling Spiders (14 species)
Mysmenidae Petrunkevitch, 1928 accepted, Dwarf cobweb spiders (5 species)
Nemesiidae Simon, 1889 accepted (102 species)
Nesticidae Simon, 1894 accepted, Comb-footed cellar spiders (61 species)
Ochyroceratidae Fage, 1912 accepted (1 species)
Oecobiidae Blackwall, 1862 accepted, Discweb spiders (19 species)
Oonopidae Simon, 1890 accepted, Goblin spiders (55 species)
Oxyopidae Thorell, 1869 accepted, Lynx spiders (18 species)
Palpimanidae Thorell, 1870 accepted (12 species)
Philodromidae Thorell, 1870 accepted, Running crab spiders (128 species)
Pholcidae C. L. Koch, 1850 accepted, Cellar spiders (85 species)
Phrurolithidae Banks, 1892 accepted, Guardstone Spiders (15 species)
Phyxelididae Lehtinen, 1967 accepted (1 species)
Pimoidae Wunderlich, 1986 accepted (4 species)
Pisauridae Simon, 1890 accepted, Nurseryweb spiders (10 species)
Prodidomidae Simon, 1884 accepted (12 species)
Salticidae Blackwall, 1841 accepted, Jumping spiders (474 species)
Scytodidae Blackwall, 1864 accepted, Spitting spiders (14 species)
Segestriidae Simon, 1893 accepted, Tubeweb spiders (19 species)
Selenopidae Simon, 1897 accepted (4 species)
Sicariidae Keyserling, 1880 accepted (5 species)
Sparassidae Bertkau, 1872 accepted, Huntsman spiders (46 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 (40 species)
Theraphosidae Thorell, 1869 accepted (19 species)
Theridiidae Sundevall, 1833 accepted, Comb-footed spiders (276 species)
Theridiosomatidae Simon, 1881 accepted, Ray's spiders (1 species)
Thomisidae Sundevall, 1833 accepted, Crab spiders (233 species)
Titanoecidae Lehtinen, 1967 accepted (24 species)
Trachelidae Simon, 1897 accepted (13 species)
Trechaleidae Simon, 1890 accepted (4 species)
Uloboridae Thorell, 1869 accepted, Cribellate orbweb spiders (9 species)
Zodariidae Thorell, 1881 accepted, Ant-hunting spiders (186 species)
Zoropsidae Bertkau, 1882 accepted, False wolf spiders (10 species)

Opiliones, Harvestmen

Buemarinoidae Karaman, 2019 accepted (2 species)
Cladonychiidae Hadži, 1935 accepted (14 species)
Dicranolasmatidae Sørensen, 1873 accepted (15 species)
Ischyropsalididae Simon, 1879 accepted (24 species)
Nemastomatidae Simon, 1872 accepted (139 species)
Parasironidae Karaman, Mitov & Snegovaya, 2024 accepted (7 species)
Phalangiidae Latreille, 1802 accepted (173 species)
Phalangodidae Simon, 1879 accepted (13 species)
Sabaconidae Dresco, 1970 accepted (9 species)
Sclerosomatidae Simon, 1879 accepted (60 species)
Sironidae Simon, 1879 accepted (41 species)
Travuniidae Absolon & Kratochvíl, 1932 accepted (6 species)
Trogulidae Sundevall, 1833 accepted (61 species)

Pseudoscorpiones, False Scorpions

Atemnidae Kishida, 1929 accepted (6 species)
Bochicidae Chamberlin, 1930 accepted (2 species)
Cheiridiidae Hansen, 1894 accepted (4 species)
Cheliferidae Risso, 1827 accepted (77 species)
Chernetidae Menge, 1855 accepted (76 species)
Chthoniidae Daday, 1889 accepted (348 species)
Garypidae Simon, 1879 accepted (6 species)
Garypinidae Daday, 1888 accepted (11 species)
Geogarypidae Chamberlin, 1930 accepted (6 species)
Hesperolpiidae Hoff, 1964 accepted (7 species)
Larcidae Harvey M. S., 1992 accepted (6 species)
Neobisiidae Chamberlin, 1930 accepted (574 species)
Olpiidae Banks, 1895 accepted (27 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 (29 species)
Galeodidae Sundevall, 1833 accepted (54 species)
Gylippidae Roewer, 1933 accepted (10 species)
Karschiidae Kraepelin, 1899 accepted (16 species)
Rhagodidae Pocock, 1897 accepted (9 species)
Solpugidae Leach, 1815 accepted (10 species)

Scorpiones, Scorpions

Belisariidae Lourenço, 1998 accepted (3 species)
Buthidae C. L. Koch, 1837 accepted (158 species)
Euscorpiidae Laurie, 1896 accepted (106 species)
Iuridae Thorell, 1876 accepted (12 species)
Scorpionidae Latreille, 1802 accepted (12 species)

Palpigradi, Microwhip Scorpions

Eukoeneniidae Petrunkevitch, 1955 accepted (50 species)

Schizomida, Shorttailed Whipscorpions

Hubbardiidae Cook, 1899 accepted (4 species)