Arachnida Cuvier, 1812
Acalyptonotidae
Allotanaupodidae Zhang & Fan, 2007
Anisitsiellidae Koenike, 1910
Arrenuridae
Athienemanniidae
Aturidae
Axonopsidae
Cheyletiellidae
Clathrosperchonidae
Dendrochaetidae Olivier, 2008
Edbakerellidae André, 2004
Eylaidae
Feltriidae
Halacaridae Murray, 1877
Harpyrinchidae
Heterocheyletidae
Hydrachnidae
Hydrodromidae
Hydrovolziidae
Hydryphantidae
Hygrobatidae
Krendowskiidae
Lebertiidae Thor, 1900
Limnesiidae
Limnocharidae
Mideidae
Mideopsidae
Momoniidae
Nautarachnidae Piersig, 1898
Neoacaridae
Oxidae Viets, 1926
Piersigiidae
Pionidae
Pontarachnidae Koenike, 1910
Protziidae
Pseudohydryphantidae
Sperchonidae Thor, 1900
Syringophilidae
Tarsocheylidae Berlese, 1904
Teutoniidae Koenike, 1910
Thermacaridae
Thyasidae
Torrenticolidae Thor, 1902
Unionicolidae
