Keyhole Limpet

Diodora graeca


Like other limpets, lives attached to stones or rocks around the lower and midshore.

How to identify

Similar to the Common Limpet, but more oval in shape and with a characteristic 'keyhole' shaped opening in the top of the greyish shell, through which it breathes when under water.

Where to find it

Found on rocky shores around the south and west of the UK.


When to find it

  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December

How can people help

Limpets and other molluscs provide a vital link in the food chain for many of our rarer species. Our seas and coastline are in need of protection if we are to keep our marine wildlife healthy. The Wildlife Trusts are working with fishermen, researchers, politicians and local people towards a vision of 'Living Seas', where marine wildlife thrives. This work has recently had a massive boost with the passing of the Marine Bill, promising sustainable development of the UK's marine environment. Do your bit for our Living Seas by supporting your local Wildlife Trust.

Species information

Common name
Keyhole Limpet
Latin name
Diodora graeca
Aquatic gastropods (e.g. sea snails)
Length: 7cm
Conservation status