Valvatidae, the valve snails, is a taxonomic family of very small freshwater snails with an operculum, aquatic gastropod mollusks.
Taxonomy The family Valvatidae has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).
Genera The type genus of this family is Valvata O.F. Müller, 1774.
Genera in the family Valvatidae include: Andrussovia Brusina, 1903 Borysthenia Lindholm, 1933 Costovalvata Polinski, 1932 Liratina Lindholm, 1906 Megalovalvata Lindholm, 1906 Valvata Müller, 1774 Cincinna Hübner, 1810 - It is recognized either as genus of a subgenus of Valvata.
Ecology Snails in the family Valvatidae are useful for measuring water quality as biological indicators. According to the Biological monitoring working party they have a score of 3, which means that they have quite a high tolerance to pollutants.
References
Haszprunar G (2014) A nomenclator of extant and fossil taxa of the Valvatidae (Gastropoda, Ectobranchia). ZooKeys 377: 1–172. https://www.pensoft.net/J_FILES/1/articles/6032/6032-G-3-layout.pdf
Further reading
Hannibal H. (1910). Valvatidae of the Western North America. The Nautilus, page 104-107.