Hydrachnidia Krantz, 1978 - water mites Superfamily Hygrobatoidea Koch, 1842 Family Omartacaridae Cook, 1963 Subfamily Omartacarinae Cook, 1963 [monotypic] Genus Omartacarus Cook, 1963 1 Subgenus Omartacarus (Omartacarus) Cook, 1963 2 Subgenus Omartacarus (Omartacarellus) Cook, 1974