Hydrachnidia Krantz, 1978 - water mites Superfamily Hydryphantoidea Piersig, 1896 - water mites Family Rhynchohydracaridae Lundblad, 1936 Subfamily Rhynchohydracarinae Lundblad, 1936 [monotypic] Genus Rhynchohydracarus Lundblad, 1936 1 Subgenus Rhynchohydracarus (Rhynchohydracarus) Lundblad, 1936 2 Subgenus Rhynchohydracarus (Coibacarus) Valdecasas, 2001