This bottom-dwelling saltwater bivalve, found in open water, is available both farmed and wild-caught. It has an oval shell; the off white to pinky-red, flat top shell has ridges radiating out from the hinge and a sculptured (‘scalloped’) outer edge and the lower shell is distinctively convex. It’s harvested by diving or box-shaped, self-tipping ‘mud dredges’, mainly off Tasmania and Victoria with smaller quantities off Jervis Bay (NSW) and Coffin Bay and Spencer Gulf (SA), though it’s found south from Torquay, Queensland to Shark Bay, WA. It is endemic to Australia.