Acanthodoris rhodoceras
Cockerell & Eliot, 1905

Suborder: DORIDINA
Family: Onchidorididae


West coast of North America - Cape Arago, Oregon to Baja California, Mexico


Coal Oil Point, Santa Barbara, California. Photo: Genevieve Anderson.

Mantle covered in tapering papillae. They are translucent white and sometimes tipped with black. There is a range in variation from those animals in which most of the papillae are black-tipped to those in which none are black-tipped. The edge of the mantle and the foot has a milky crean-yellow border and the mantle also an inner black line. This species grows to 30mm long.

Goddard, (1990) reports it feeding on the bryozoan Alcyonidium sp..

• Cockerell, T.D.A. & Eliot, C.N.E. (1905) Notes on a collection of Californian nudibranchs. Journal of Malacology, 12(3): 31-53, pls. 7-8.
• Behrens, D.W. (1991) Pacific Coast Nudibranchs: a guide to the opisthobranchs, Alaska to Baja California. 107 pp., 217 photos. Second Edition. Sea Challengers: Monterey, California.
• Goddard, J. H. R. 1990. Additional opisthobranch mollusks from Oregon, with a review of deep-water records and observations on the fauna of the south coast. The Veliger, 33(3): 230-237.

Authorship details
Rudman, W.B., 2003 (March 2) Acanthodoris rhodoceras Cockerell & Eliot, 1905. [In] Sea Slug Forum. Australian Museum, Sydney. Available from

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