Known to live either attached by byssus threads or in a free state.
- The hinge does not possess teeth
- The surface is sculptured with radiating ribs and concentric lines giving it a rough appearance
Brittle shell up to 1.5cm in length. The inside of the shell is white and the outside is white or light brown. The surface of the shell is sculptured with radiating ribs and concentric lines. The margin of the shell is crenulated.