The valves of the shell are decorated with many spiny protuberances up to long.When it is lying on the seabed it is usually not visible because of the algae, marine animals and sediment that cover the shell.
The valves of the shell are decorated with many spiny protuberances up to long. When the living animal is lying on the seabed it is usually not visible because of the algae, marine animals and sediment that cover the shell.