Nudibranch gastropod mollusc with a body similar to a snail's, very elongated and with undulated edges. It has a pair of lamellar tentacles on its head and a prominent branchial tuft. Violet to yellowish-green with numerous yellow blotches. Found on rocky and detritus beds from 3-4 meters to over 40 meters. Maximum size approx. 20 centimeters.