Hydrachnidia Krantz, 1978 - water mites Superfamily Hygrobatoidea Koch, 1842 Family Hygrobatidae Koch, 1842 Genus Hygrobatopsis Viets, 1924 1 Subgenus Hygrobatopsis (Hygrobatopsis) Viets, 1924 2 Subgenus Hygrobatopsis (Hygrobatopsella) Cook, 2005