Hydrachnidia Krantz, 1978 - water mites Superfamily Hygrobatoidea Koch, 1842 Family Hygrobatidae Koch, 1842 Genus Diamphidaxona Cook, 1963 1 Subgenus Diamphidaxona (Diamphidaxona) Cook, 1963 2 Subgenus Diamphidaxona (Diamphidaxonella) Smith & Cook, 2006