Hydrachnidia Krantz, 1978 - water mites Superfamily Hydryphantoidea Piersig, 1896 - water mites Family Hydryphantidae Piersig, 1896 Subfamily Pseudohydryphantinae Viets, 1926 1 Genus Cyclohydryphantes Lundblad, 1941 2 Genus Pseudohydryphantes Viets, 1907