Intertidal Invertebrates of the Monterey Bay Area, California

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

Catriona columbiana (O'Donoghue, 1922)               
Red-tentacle Cuthona
Mollusca: Gastropoda: Opisthobranchia: Nudibranchia: Aeolidina: Tergipedidae
Geographic Range: Cutter Rock, Ketchikan, Alaska, to San Diego, CA; Japan; South Africa. Synonyms: Catriona alpha, Cratena spadix, Cuthona alpha
Back to: Aeolidina Back to: Intertidal Invertebrates of the Monterey Bay Area
Asilomar, Monterey Co., CA; 27 Apr 2009; 9mm total length.

Description: Ground color translucent greyish-white, with a somewhat triangular opaque white patch between rhinophores and oral tentacles. Cerata with a broad band of encrusting white from base to tip of each ceras, cores brown (burnt sienna to deep burnt umber). Rhinophores smooth, distal two thirds red-orange, with white tips. Oral tentacles red-orange with white tips and bases. Anterior foot corners rounded. Occasional specimens may be quite pale.
Size: To about 10mm or more in length.
Notes: Feeds on several species of hydroids such as Tubularia spp., Obelia spp., & Syncoryne eximia.

Carmel Pt., Monterey Co., CA; 25 May 2009; 9mm total length.
Carmel Pt., Monterey Co., CA; 25 May 2009; 9mm total length.
Skipper's Docks, Elkhorn Slough, Monterey Co., CA; 1 Nov 1972; 14mm total length.
Great Tidepool, Pacific Grove, Monterey Co., CA; 26 May 2009; 7mm total length.
Great Tidepool, Monterey, Monterey Co., CA; 22 Jun 1986.
Monterey Harbor Docks, Monterey Co., CA; 13 Dec 2008; ~5mm total length.
Asilomar, Monterey Co., CA; 15 May 1972; 8mm total length.
Asilomar, Monterey Co., CA; 12 Jun 1972; 7mm total length.

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