A marine and estuarine bivalve mollusc with a rough cream, greyish white, pale yellow or light brown shell with sculptured concentric ridges, often with darker patterning and pink, orange or blue tinges near the hinge. They are found around the south-eastern Australian coast (including Tasmania) and harvested by hand in NSW from sand and silt along coastlines with moderate current flow, sometimes off ocean beaches and often near beds of Posidonia seagrass.