Hydrachnidia Krantz, 1978 - water mites
Superfamily Lebertioidea Thor, 1900
Family Limnesiidae Thor, 1900
01 Subfamily Epallagopodinae Viets, 1953 [monotypic]
02 Subfamily Kawamuracarinae Viets, 1943 [monotypic]
03 Subfamily Limnesiinae Thor, 1900
04 Subfamily Mixdeinae Orghidan & Gruia, 1980
05 Subfamily Mixolimnesiinae Cook, 1988 [monotypic]
06 Subfamily Neomamersinae Lundblad, 1953
07 Subfamily Neotorrenticolinae Lundblad, 1936 [monotypic]
08 Subfamily Nicalimnesiinae Cook, 1967 [monotypic]
09 Subfamily Protolimnesiinae Viets, 1940
10 Subfamily Psammolimnesiinae Cook, 1974 [monotypic]
11 Subfamily Raptorhydracarinae Pešić & Gerecke, 2014 [monotypic]
12 Subfamily Rheolimnesiinae Goldschmidt, 2004
13 Subfamily Tyrrelliinae Koenike, 1910