Hydrachnidia Krantz, 1978 - water mites Superfamily Hygrobatoidea Koch, 1842 Family Hygrobatidae Koch, 1842 Genus Tetrabates Thor, 1923 1 Subgenus Tetrabates (Tetrabates) Thor 1923 2 Subgenus Tetrabates (Liberiobates) Cook, 1974