Hydrachnidia Krantz, 1978 - water mites Superfamily Hydryphantoidea Piersig, 1896 - water mites Family Hydryphantidae Piersig, 1896 Subfamily Hydryphantinae Piersig, 1896 Genus Hydryphantes Koch, 1842 1 Subgenus Hydryphantes (Hydryphantes) Koch, 1842 2 Subgenus Hydryphantes (Polyhydryphantes) Viets, 1926