Hydrachnidia Krantz, 1978 - water mites Superfamily Lebertioidea Thor, 1900 Family Sperchontidae Thor, 1900 Subfamily Sperchontinae Thor, 1900 1 Genus Illiesiella Besch, 1964 2 Genus Notosperchonopsis Besch, 1964 3 Genus Sperchon Kramer, 1877 4 Genus Sperchonopsis Piersig, 1896