Hydrachnidia Krantz, 1978 - water mites Superfamily Arrenuroidea Thor, 1900 Family Krendowskiidae Viets, 1926 1 Genus Allokrendowskia Lundblad, 1941 2 Genus Geayia Thor, 1897 3 Genus Krendowskia Piersig, 1895 4 Genus Roqueella Lundblad, 1931