Alivarvioidulla

Alivarvioidulla, also known as Alivariodulla, is a genus of small, freshwater snails with a gill and an operculum, an external shell closure. The genus is endemic to the island of Sri Lanka, where it inhabits freshwater habitats such as streams, rivers, and ponds. Alivarvioidulla species are characterized by their small, conical shells with a smooth surface and a distinct aperture. The genus was first described by the German malacologist Carl Eduard Adolph Gerstaecker in 1856.

The genus Alivarvioidulla includes several species, with the most well-known being Alivarvioidulla alivariodulla. This species is known for its distinctive shell, which is typically light brown or cream-colored with a spiral pattern. The shell is small, measuring about 10-15 millimeters in length, and has a conical shape with a smooth surface. The aperture is distinct and rounded, with a thin, translucent operculum.

Alivarvioidulla species are herbivorous, feeding on algae and other plant material found in their freshwater habitats. They are an important part of the local ecosystem, helping to control the growth of algae and other aquatic plants. However, their populations have been declining in recent years due to habitat loss and pollution, making them a species of conservation concern.

Despite their small size, Alivarvioidulla species play a crucial role in the ecosystem of Sri Lanka. Their presence helps to maintain the balance of freshwater habitats, and their decline could have significant impacts on the local environment. Conservation efforts are underway to protect these species and their habitats, including the establishment of protected areas and the promotion of sustainable practices in the region.