Solid shell up to about 1.5cm in length. The right valve is very much larger than the left. The outside is white tinged with yellow. The inside is also white but tinged with blue, pink or yellow. The surface is sculptured with strong concentric ridges with a few faint radiating lines present on the left valve. The pallial line is faint and shows little indentation for the pallial sinus.
- Right valve markedly larger than the left
Burrows just below the surface in muddy sand or gravel where it feeds by filtering phytoplankton
CommonDistributed from Norway south to the Iberian Peninsula and into the Mediterranean and Black Seas.