Intertidal Invertebrates of the Monterey Bay Area, California

Compiled & photographed by Gary McDonald, Long Marine Laboratory, University of California, Santa Cruz

Acanthodoris rhodoceras Cockerell in Cockerell & Eliot, 1905               
Black-tipped Spiny Dorid
Mollusca: Gastropoda: Opisthobranchia: Nudibranchia: Doridina: Anadoridoidea: Onchidorididae
Geographic Range: Umpqua River, OR, to Bahia de los Angeles, Baja California, Mexico. Synonyms:
Back to: Doridina Back to: Intertidal Invertebrates of the Monterey Bay Area
Acanthodoris_rhodoceras_0002
Scott Creek, Santa Cruz Co., CA; 10 Dec 2008; 22mm total length.

Description: Dorsum greyish-white, may be sprinkled with tiny flecks of yellow and dark brown to black, with numerous large black tipped papillae, often with outer yellow band and inner black band around margin of dorsum. Rhinophores long with about 13-23 lamellae, often with brown to black near tip. Branchial plumes 5, bi- and tripinnate, greyish-white, often tipped with deep yellow or brown to black.
Size: Typically less than 30mm in length.
Notes: Jeff Goddard reports that it feeds on the bryozoan Alcyonidium sp.

Acanthodoris_rhodoceras_0017
Scott Creek, Santa Cruz Co., CA; 10 Dec 2008; 22mm total length.
Acanthodoris_rhodoceras_slide_001
Sunset Palisades, San Luis Obispo Co., CA; 28 Dec 1971; 24mm total length.
Acanthodoris_rhodoceras_slide_002
La Jolla, San Diego Co., CA; 25 June 1975; 14mm total length.
Acanthodoris_rhodoceras_slide_003
Morro Bay, San Luis Obispo Co., CA; 17 Oct 1971; 11mm total length.
Acanthodoris_rhodoceras_slide_004
Morro Bay, San Luis Obispo Co., CA; 11 Nov 1973; 9mm total length.
 

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