UncommonDistributed from northern Norway to the Iberian Peninsula and into the Mediterranean.
Lives on muddy sand to fine gravel where it feeds by filtering phytoplankton.
- The ears of the left valve are equal and almost equal on right valve
- Shell without ribs; only fine concentric and radiating lines
- Right valve is smaller than the left
Thin, fragile, shell up to 1cm in length. It is white, yellow, grey or light brown in colour sometimes displaying irregular patterns. The surface lacks ribs but is sculptured with fine concentric and radiating lines.