Hydrachnidia Krantz, 1978 - water mites
   Superfamily Arrenuroidea Thor, 1900
     Family Athienemanniidae Viets, 1922
       Subfamily Athienemanniinae Viets, 1922
         1 Genus Anamundamella Cook, 1992
         2 Genus Bleptomundamella Cook, 2001
         3 Genus Chelohydracarus Smith, 1998
         4 Genus Chelomideopsis Romijn, 1920
         5 Genus Mundamella Viets, 1913
         6 Genus Penemundamella Cook, 2001
         7 Genus Platyhydracarus Smith, 1989
         8 Genus Stygohydracarus Viets, 1932