The Ramshorn Snail (Anisus vorticulus) is a small snail, with a shell of only 4 to 5 mm in diameter and 0, 5 to 0, 6 mm in height.

This snail prefers backwaters and it inhabits areas with floating aquatic vegetation, especially those exposed to sunshine.

This species is hermaphrodite, each specimen having both male and female sexual organs. The reproduction period begins in spring. For reproduction are needed two specimens. The snail lays around 100 eggs, which are protected by gelatinous capsules. Hatching takes 10 days and it is influenced by water temperature.

The Ramshorn Snail feeds on detritus and algae remains. In Europe live only a few stable populations.
This species is affected by water pollution, especially by the pollution with fertilizers. Also, the eutrophication of the habitat has negative effects on this species.