tavallisella

Tavallisella is a genus of small, freshwater snails with a gill and an operculum, an external shell. It is a member of the family Hydrobiidae, which includes many other freshwater snail species. The genus was first described by the German malacologist Karl Heinrich Rosenbusch in 1932. Tavallisella species are typically found in Europe, with a few species occurring in Asia and North America.

The genus Tavallisella is characterized by its small, conical shells with a smooth or slightly sculptured surface. The shells are typically brown or reddish-brown in color. The operculum is also small and conical, and is typically brown or reddish-brown in color.

Tavallisella species are herbivorous, feeding on algae and other plant material. They are typically found in slow-moving or still waters, such as ponds, lakes, and marshes. Tavallisella species are often used as indicators of water quality, as they are sensitive to pollution and other environmental factors.

There are currently 12 recognized species in the genus Tavallisella. These include Tavallisella angustior, Tavallisella balthica, Tavallisella borysthenica, Tavallisella caspia, Tavallisella danubialis, Tavallisella hungarica, Tavallisella kessleri, Tavallisella lymnaeoides, Tavallisella obtusior, Tavallisella pontica, Tavallisella rossica, and Tavallisella trossulus. The taxonomy of the genus is still a subject of ongoing research, and new species may be described in the future.