-- high-spired parthenogenic snails of the tropics, includes those referred to as "trumpet snails" in aquaria. About 110 species.

;Littorinimorpha
* Littorinidae -- 9 species in the genus Cremnoconchus are freshwater living in streams and waterfalls. Other species are marine.
* Amnicolidae -- about 200 species.
* Assimineidae -- about 20 freshwater species, other are marine