Fragile shell up to 1cm in length. Shell white but often obscured by a rust coloured deposit. Inside may have a light purple tinge. The surface of the shell is sculptured with concentric lines and a few faint radiating lines.
Key identification features
- Surface sculptured with concentric lines but not ridged
- No posterior latteral tooth
- Rust coloured deposit on shell surface
Ecology and behaviour
Lives commensal with the sea urchin Echinocardium cordatum particularly in muddy sand.
Distribution and status
FrequentDistributed from the north of Norway south to the Mediterranean