Hydrachnidia Krantz, 1978 - water mites Superfamily Lebertioidea Thor, 1900 Family Oxidae Viets, 1926 Genus Oxus Kramer, 1877 1 Subgenus Oxus (Oxus) Kramer, 1877 2 Subgenus Oxus (Flabellifrontipoda) Lundblad, 1948 3 Subgenus Oxus (Gnaphiscus) Koenike, 1898