Hydrachnidia Krantz, 1978 - water mites Superfamily Hygrobatoidea Koch, 1842 Family Unionicolidae Oudemans, 1909 Subfamily Pionatacinae Viets, 1916 Genus Koenikea Wolcott, 1900 Subgenus Koenikea (Koenikea) Wolcott, 1900