Hydrachnidia Krantz, 1978 - water mites Superfamily Hydryphantoidea Piersig, 1896 - water mites Family Hydryphantidae Piersig, 1896 Subfamily Hydryphantinae Piersig, 1896 1 Genus Hydryphantes Koch, 1842 2 Genus Georgella Koenike, 1907