Bythinellidae
Bythinellidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the order 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
Genera in the family Bythinellidae include:Bythinella Moquin-Tandon, 1856Strandzhia Georgiev & Glöer, 2013Terrestribythinella Sitnikova, Starobogatov & V. Anistratenko, 1992;Genera brought into synonymy:Acrophlyctis Cossmann, 1888 †: synonym of Bythinella Cossmann, 1888 † represented as Bythinella Moquin-Tandon, 1856Bithinella : synonym of Bythinella Moquin-Tandon, 1856 Bithynella Moquin-Tandon, 1856: synonym of Bythinella Moquin-Tandon, 1856 Bythynella: synonym of Bythinella Moquin-Tandon, 1856 Microna Frauenfeld, 1863: synonym of Bythinella Moquin-Tandon, 1856