Hydrachnidia Krantz, 1978 - water mites
Superfamily Lebertioidea Thor, 1900
01 Family Acucapitidae Wiles, 1996 [monotypic]
02 Family Anisitsiellidae Koenike, 1910
03 Family Bandakiopsidae Panesar, 2004
04 Family Lebertiidae Thor, 1900
05 Family Limnesiidae Thor, 1900
06 Family Rutripalpidae Sokolow, 1934 [monotypic]
07 Family Oxidae Viets, 1926
08 Family Sperchontidae Thor, 1900
09 Family Stygotoniidae Cook, 1992 [monotypic]
10 Family Teutoniidae Koenike, 1910
11 Family Torrenticolidae Piersig, 1902