Brown Horned Dorid

Acanthodoris brunnea MacFarland, 1905

Description 2

Dorsum brownish to almost black, with small yellow flecks and numberous large, blunt conical tubercles. Rhinophores long with about 20-28 lamellae. Branchial plumes 7, bipinnate, brown, usually tipped with yellow, arranged in a circle around anus. Labial tentacles large and auriculate, extending nearly to edge of dorsum. Most likely feeds on bryozoans. Very rare in the intertidal. Similar to the more common Onchidoris bilamellata, which has shorter rhinophores; lower, rounded tuberlces on dorsum, and branchial plumes arranged in 2 arches around the anus.

Size 2

Up to about 15mm in length.

Geographic Range 2

Vancouver, British Columbia, Canada, to Santa Monica Bay, Los Angeles Co., CA.

Notes 2

May emit pungent odor of cedar when handled.

References 2

ANONYMOUS. 2003. Annual receiving waters monitoring report for the city of San Diego South Bay Water Reclamation Plant discharge to the Pacific Ocean through the South Bay ocean outfall, 2002. City of San Diego, Metropolitan Wastewater Department, Environmental Monitoring & Technical Services Division, Ocean Monitoring Program, iv + 184 pp.

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More Info

iNat Map

Rhinophores perfoliate
Classification Doridina
Body doridiform
Dorsum with conical tubercles
Labial tentacles large & auriculate & extending nearly to edge of dorsum