Hydrachnidia Krantz, 1978 - water mites Superfamily Hygrobatoidea Koch, 1842 Family Unionicolidae Oudemans, 1909 Subfamily Encentridophorinae Viets, 1935 [monotypic] Genus Encentridophorus Piersig, 1897 Subgenus Encentridophorus (Encentridophorus) Piersig, 1897