Perusollena

Perusollena is a genus of small to medium-sized freshwater snails with a gill and an operculum, an aquatic operculate gastropod mollusk in the family Hydrobiidae. The genus was first described by the German malacologist Karl Ludwig Koch in 1848. The name Perusollena is derived from the Latin word "perus," meaning "clean," and "sollena," which refers to the smooth shell surface.

Species within the genus Perusollena are typically found in freshwater habitats such as ponds, lakes, and slow-moving rivers. They are known for their distinctive, smooth shells that lack any ornamentation. The shells are usually light brown or yellowish in color, with a glossy appearance. The operculum, or lid, is also smooth and typically has a similar color to the shell.

Perusollena species are herbivorous, feeding on algae and other plant material. They play an important role in their ecosystems by helping to control the growth of aquatic plants. The genus is found in various parts of the world, including Europe, Asia, and North America.

The taxonomy of Perusollena is still a subject of ongoing research. Some species have been reclassified or redescribed, and new species continue to be discovered. Despite these changes, the genus remains an important group of freshwater snails for both scientific study and ecological conservation efforts.