Valvatidae

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.