Intertidal Organisms EZ-ID GUIDES


on this species


Onchidella borealis (Leather limpet)

photo of leather limpet
Copyright © 2005 Mary Jo Adams


This little guy is tiny (it only grows to about ½ inch long) so you'll have to look for it to find it. It is related to both land slugs and sea slugs (nudibranchs) but doesn't fit exactly into either category. Watch for it among seaweed holdfasts and in rocky crevices. It's easy to mistake Onchidella for a limpet but it has a leathery appearance and distinct scalloping along its edge. Onchidella borealis is an herbivore, grazing on algae and diatoms.


This page was created by Mary Jo Adams on 11/3/05.



photo of leather limpet