Hydrachnidia Krantz, 1978 - water mites Superfamily Hygrobatoidea Koch, 1842 Family Aturidae Thor, 1900 1 Subfamily Albiinae Viets, 1925 2 Subfamily Axonopsinae Viets, 1929 3 Subfamily Aturinae Thor, 1900 4 Subfamily Notoaturinae Besch, 1964