Brittle shell up to 30cm in length. It is light to dark brown in colour both inside and outside but inside is glossy. The surface is sculptured with concentric lines and 8 to 12 radiating ribs. There are no teeth on the hinge.
Key identification features
- Very distinctive triangular outline
- Two adductor muscle scars
Ecology and behaviour
Lives with pointed end buried in bottoms of mud to gravel where it attaches itself with byssus threads. Tend to be quite a gregarios species
Distribution and status
Rare. Distributed from Britain south to the Iberian Peninsula
The map provided here shows the distribution of the species based on Conchological Society data.