• Norwegian: -


It may be confused with O. muricata, but has more pointed tubercles of varying size. The color varies from white to light yellow. It can reach a body length of 2,5 cm.


It is frequently seen on algae in the subtidal zone, feeding on the Bryozoan Electra pilosa. It has been registered as deep as 60 meters.


This northern species has a circumpolar distribution, both in the Pacific and Atlantic Oceans. In Europe it is registered on Greenland, the British Isles, around Iceland and in Norway.