Diameter 30 mm. The shell coils in a flat spiral with a flared mouth. Albinos are common and these have a red, rather than black, body due to the blood showing through the skin.

Inhabits small, still, weedy ponds and drains.

All year round.

These snails graze on algae by scraping rocks with a special tongue with embedded teeth called a radula. They lay their eggs in a protective mass of jelly on plants or any other underwater structure.

Common in much of England, but fewer records from Wales and Scotland.

Common in Leicestershire and Rutland.