Brittle shell up to about 8cm in length. Grey brown or pale brown in colour with darker radiating rays. The inside of the shell is pearly. The surface is sculptured with concentric scales which may be worn away to lines.
- Shell with two 'ears'
- One adductor muscle scar
Lives attached by byssus threads on muddy to gravelly bottoms.
RareDistributed from Britain south to the Iberian Peninsula and into the Mediterranean.