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, 1856
 * Strandzhia Georgiev & Glöer, 2013
 * Terrestribythinella Sitnikova, Starobogatov & V. Anistratenko, 1992
 * Genera brought into synonymy:
 * Acrophlyctis Cossmann, 1888 †: synonym of Bythinella (Acrophlyctis) Cossmann, 1888 † represented as Bythinella Moquin-Tandon, 1856
 * Bithinella [sic]: synonym of Bythinella Moquin-Tandon, 1856 (incorrect subsequent spelling)
 * Bithynella Moquin-Tandon, 1856 : synonym of Bythinella Moquin-Tandon, 1856 (incorrect subsequent spelling)
 * Bythynella: synonym of Bythinella Moquin-Tandon, 1856 (invalid: incorrect subsequent spelling)
 * Microna Frauenfeld, 1863 : synonym of Bythinella Moquin-Tandon, 1856