Hydrachnidia Krantz, 1978 - water mites Superfamily Hydryphantoidea Piersig, 1896 - water mites Family Teratothyadidae Viets, 1929 Genus Teratothyasides Lundblad, 1941 1 Subgenus Teratothyasides (Teratothyasides) Lundblad, 1941 2 Subgenus Teratothyasides (Hansvietsia) Viets, 1951 3 Subgenus Teratothyasides (Rhynchohansvietsia) Viets & Bottger, 1974