All families

104 families:

Araneae

Agelenidae C. L. Koch, 1837 valid, Funnelweb spiders (252 species)

Amaurobiidae Thorell, 1870 valid, Laceweb spiders (43 species)

Anapidae Simon, 1895 valid (5 species)

Anyphaenidae Bertkau, 1878 valid, Buzzing spiders (6 species)

Araneidae Clerck, 1757 valid, Orbweb spiders (149 species)

Atypidae Thorell, 1870 valid, Purseweb spiders (4 species)

Bemmeridae Simon, 1903 valid (1 species)

Cheiracanthiidae Wagner, 1887 valid (39 species)

Cithaeronidae O. Pickard-Cambridge, 1872 valid (2 species)

Clubionidae Wagner, 1887 valid, Sac spiders (54 species)

Corinnidae Karsch, 1880 valid, Ant-like sac spiders (6 species)

Ctenidae Keyserling, 1877 valid (5 species)

Ctenizidae Thorell, 1887 valid (6 species)

Cybaeidae Banks, 1892 valid, Soft spiders (27 species)

Cyrtaucheniidae Simon, 1889 valid (13 species)

Desidae Pocock, 1895 valid (1 species)

Dictynidae O. Pickard-Cambridge, 1871 valid, Meshweb spiders (74 species)

Dysderidae O. Pickard-Cambridge, 1871 valid, Woodlouse spiders (431 species)

Eresidae C. L. Koch, 1850 valid, Velvet spiders (35 species)

Filistatidae Simon, 1864 valid (19 species)

Gnaphosidae Banks, 1892 valid, Ground spiders (618 species)

Hahniidae Bertkau, 1878 valid, Lesser cobweb spiders (31 species)

Halonoproctidae Pocock, 1901 valid (4 species)

Hersiliidae Thorell, 1869 valid (6 species)

Idiopidae Simon, 1889 valid (1 species)

Leptonetidae Simon, 1890 valid (73 species)

Linyphiidae Blackwall, 1859 valid, Money spiders (1,458 species)

Liocranidae Simon, 1897 valid, Running foliage spiders (66 species)

Lycosidae Sundevall, 1833 valid, Wolf spiders (397 species)

Macrothelidae Simon, 1892 valid (3 species)

Mimetidae Simon, 1881 valid, Pirate spiders (11 species)

Miturgidae Simon, 1886 valid (12 species)

Mysmenidae Petrunkevitch, 1928 valid, Dwarf cobweb spiders (4 species)

Nemesiidae Simon, 1889 valid (91 species)

Nesticidae Simon, 1894 valid, Comb-footed cellar spiders (58 species)

Ochyroceratidae Fage, 1912 valid (1 species)

Oecobiidae Blackwall, 1862 valid, Discweb spiders (16 species)

Oonopidae Simon, 1890 valid, Goblin spiders (52 species)

Oxyopidae Thorell, 1869 valid, Lynx spiders (18 species)

Palpimanidae Thorell, 1870 valid (11 species)

Philodromidae Thorell, 1870 valid, Running crab spiders (121 species)

Pholcidae C. L. Koch, 1850 valid, Cellar spiders (66 species)

Phrurolithidae Banks, 1892 valid (15 species)

Phyxelididae Lehtinen, 1967 valid (1 species)

Pimoidae Wunderlich, 1986 valid (4 species)

Pisauridae Simon, 1890 valid, Nurseryweb spiders (9 species)

Salticidae Blackwall, 1841 valid, Jumping spiders (490 species)

Scytodidae Blackwall, 1864 valid, Spitting spiders (12 species)

Segestriidae Simon, 1893 valid, Tubeweb spiders (18 species)

Selenopidae Simon, 1897 valid (2 species)

Sicariidae Keyserling, 1880 valid (4 species)

Sparassidae Bertkau, 1872 valid, Huntsman spiders (39 species)

Symphytognathidae Hickman, 1931 valid (1 species)

Synaphridae Wunderlich, 1986 valid (5 species)

Telemidae Fage, 1913 valid (1 species)

Tetragnathidae Menge, 1866 valid, Long-jawed orbweb spiders (39 species)

Theraphosidae Thorell, 1869 valid (10 species)

Theridiidae Sundevall, 1833 valid, Comb-footed spiders (268 species)

Theridiosomatidae Simon, 1881 valid, Ray's spiders (1 species)

Thomisidae Sundevall, 1833 valid, Crab spiders (229 species)

Titanoecidae Lehtinen, 1967 valid (20 species)

Trachelidae Simon, 1897 valid (10 species)

Uloboridae Thorell, 1869 valid, Cribellate orbweb spiders (10 species)

Zodariidae Thorell, 1881 valid, Ant-hunting spiders (170 species)

Zoropsidae Bertkau, 1882 valid, False wolf spiders (10 species)

Opiliones

Buemarinoidae Karaman, 2019 valid (2 species)

Cladonychiidae Hadži, 1935 valid (8 species)

Dicranolasmatidae Sørensen, 1873 valid (14 species)

Ischyropsalididae Simon, 1879 valid (24 species)

Nemastomatidae Simon, 1872 valid (106 species)

Phalangiidae Latreille, 1802 valid (103 species)

Phalangodidae Simon, 1879 valid (13 species)

Sabaconidae Dresco, 1970 valid (9 species)

Sclerosomatidae Simon, 1879 valid (58 species)

Sironidae Simon, 1879 valid (33 species)

Travuniidae Absolon & Kratochvíl, 1932 valid (16 species)

Trogulidae Sundevall, 1833 valid (61 species)

Pseudoscorpiones

Atemnidae Kishida, 1929 valid (9 species)

Bochicidae Chamberlin, 1930 valid (2 species)

Cheiridiidae Hansen, 1894 valid (3 species)

Cheliferidae Risso, 1826 valid (69 species)

Chernetidae Menge, 1855 valid (72 species)

Chthoniidae Daday, 1889 valid (355 species)

Garypidae Simon, 1879 valid (6 species)

Garypinidae Daday, 1888 valid (10 species)

Geogarypidae Chamberlin, 1930 valid (6 species)

Larcidae Harvey M. S., 1992 valid (6 species)

Neobisiidae Chamberlin, 1930 valid (548 species)

Olpiidae Banks, 1895 valid (30 species)

Pseudotyrannochthoniidae Beier, 1932 valid (1 species)

Syarinidae Chamberlin, 1930 valid (23 species)

Withiidae Chamberlin, 1931 valid (6 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 (7 species)

Gylippidae Roewer, 1933 valid (2 species)

Karschiidae Kraepelin, 1899 valid (4 species)

Scorpiones

Belisariidae Lourenço, 1998 valid (3 species)

Buthidae C. L. Koch, 1837 valid (19 species)

Euscorpiidae Laurie, 1896 valid (98 species)

Iuridae Thorell, 1876 valid (12 species)

Palpigradi

Eukoeneniidae Petrunkevitch, 1955 valid (44 species)

Schizomida

Hubbardiidae Cook, 1899 valid (4 species)