Bithyniidae

Bithyniidae
Bithynia tentaculata
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Caenogastropoda
Clade:	Hypsogastropoda
Clade:	Littorinimorpha
Superfamily:	Truncatelloidea
Family:	Bithyniidae Gray, 1857
Genera
See text
Diversity
about 130 freshwater species

See text

Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the clade Littorinimorpha.

Their minute shell is often colored. They are characterized by a calcareous operculum, a lobe on the upper surface of the neck. The ctenidium, the respiratory gill-comb, is very broad. They have a ciliary feeding habit. The kidney has a large extension towards the mantle.

Genera in the family Bithyniidae include:

...
Wikipedia