Analysoidulla

Analysoidulla is a genus of small, freshwater snails with a smooth shell, belonging to the family Hydrobiidae. The genus was first described by the German malacologist Karl Heinrich Rosenbusch in 1932. Analysoidulla species are characterized by their minute size, typically measuring less than 2 millimeters in length, and their lack of a distinct operculum, which is the shell that covers the aperture of the shell in most gastropods. The shell is typically conical to ovate in shape, with a smooth surface and a narrow aperture.

The genus is found in Europe, with species occurring in various freshwater habitats such as ponds, lakes, and slow-moving streams. Analysoidulla species are often found in association with other small, freshwater snails and are known to feed on algae and detritus. The genus is of particular interest to malacologists due to its small size and the challenges it presents for identification and classification.

The genus Analysoidulla currently includes two recognized species: Analysoidulla analis and Analysoidulla balthica. Both species are small, with a similar shell morphology, but they differ in their geographic distribution and ecological preferences. Analysoidulla analis is found in central and southern Europe, while Analysoidulla balthica is more commonly found in northern Europe. Despite their small size and similar appearance, these species are important indicators of freshwater health and biodiversity.