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DescriptionA well camouflaged, brown-coloured nudibranch. The cerata are numerous, with rough, spiny surfaces and tapering to points, and extend across the front of the body. They fall off with the minimum of disturbance, and may poison other nudibranchs in a collecting dish. The rhinophores are brown, with spiral grooves and a crest structure as in the previous species. The digestive gland in the cerata is dark brown, and does not extend to the tip. Grows up to 30mm in length. The rare Proctonotus mucroniferus is similar in appearance, but lacks the crest between the rhinophores.