The shell lacks a keel and the peripheral angle is relatively prominent, with a slender, narrow periostracal fringe.

[1][12] In the British Isles, this species is restricted to a small number of sites in the Norfolk Broads and the Pevensey Levels and Arun Valley in Sussex and Surrey.

[1][13] This small snail lives in pools with standing water and in oxbow lakes, but these biotopes are threatened because of sedimentation and ecological succession.

Invasive plants such as floating marsh pennywort, (Hydrocotyle ranunculouides), that sometimes chokes ditches, and the Himalayan balsam (Impatiens glandulifera) are particularly harmful.

[1][13] The main threats to this snail include land drainage, poor habitat management and eutrophication.