• Norwegian: -


It may be confused with O. muricata and O. proxima, but have larger and fewer tubercles. The mantle has usually a more circular shape and may reach a diameter of 32 mm. The color is white, light yellow or beige.


It is most frequent just below the tidal zone, sitting on algae and feeding on bryozoans, but has been observed as deep as 200 meters.


It is registered in the East Atlantic Ocean, from Trøndelag, Norway to France.