_- Acarophenacidae
- Anisitsiellidae
- Arrenuridae
- Athienemanniidae
- Aturidae
- Axonopsidae
- Caligonellidae
- Calyptostomatidae
- Chappuisididae
- Clathrosperchonidae
- Cloacaridae
- Demodicidae
- Erythracaridae
- Eupalopsellidae
- Eutrombidiidae
- Eylaidae
- Feltriidae
- Frontipodopsidae
- Halacaridae
- Harpirhynchidae
- Harpyrhynchidae
- Hungarohydracaridae
- Hydrachnidae
- Hydrodromidae
- Hydrovolziidae
- Hydryphantidae
- Hygrobatidae
- Iolinidae
- Johnstonianidae
- Krendowskiidae
- Lebertiidae
- Lethaxonidae
- Limnesiidae
- Limnocharidae
- Meyerellidae
- Microdispidae
- Mideidae
- Mideopsidae
- Momoniidae
- Nautarachnidae
- Nematalycidae
- Neoacaridae
- Neothrombiidae
- Oxidae
- Piersigiidae
- Pionidae
- Podothrombiidae
- Pontarachnidae
- Protziidae
- Pseudohydryphantidae
- Raphignathidae
- Rhynchohydracaridae
- Sperchonidae
- Stygothrombiidae
- Syringophilidae
- Tanaupodidae
- Teratothyadidae
- Teutoniidae
- Thyasidae
- Torrenticolidae
- Trombidiidae
- Unionicolidae