Great Ramshorn Snail - Planorbarius corneus


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.

Identification difficulty

Inhabits small, still, weedy ponds and drains.

When to see it

All year round.

Life History

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.

UK Status

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

VC55 Status

Common in Leicestershire and Rutland.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map

Species profile

Common names
Great Ramshorn, Great Ramshorn Snail
Species group:
Slugs & Snails
Records on NatureSpot:
First record:
15/08/1981 (Nicholls, David)
Last record:
17/02/2024 (Nicholls, David)

Total records by month

% of records within its species group

10km squares with records

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