Cuthona? from Japan

March 7, 2006
From: Sayoko Matsuda

Dear Dr. Bill,
Hello. I write to you for the first time. I do work of a diving guide Otsuki-cyou Issai Kochi Prefecture Japan. I send a photograph of the sea slug which I found in the summer of last year. It was on an old net on a rock.
This sea slug resembled an unidentified kind on the Forum [Message #15636 ].

Locality: Otsuki-cyo Issai (the Pacific coasts of Japan), 5 m, Kochi Prefecture Japan, Pacific Ocean, 17 August 2005, rock. Length: 5 mm or less. Photographer: Nao.

What do you think? I hope these photographs help your study.
Please forgive mistakes in my English.
Yours sincerely,
Sayoko Matsuda

Sayoko Matsuda, 2006 (Mar 7) Cuthona? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Sayo,
This is truly a beautiful Cuthona and I agree it looks like the photo in message #15636.  I think we should call this Cuthona sp. 8, until we can find a name for it.  I cannot find anything vaguely like it.  The color is certainly striking.

Interestingly, your animal looks remarkably similar to an  Cuthona sp. 9 collected in Bahia Banderas, Mexico, by Alicia Hermosillo [Species #307; Behrens & Hermosillo, 2005].  The cerata are very close but the head color is white in the Mexican specimen.

Please write to us often, and incidentally, your English is better that many of my friends.  No apology necessity.

  • Behrens, D.W. & A. Hermosillo.  2005.  Eastern Pacific Nudibranchs - A guide to the opisthobranchs from Alaska to Central America.  Sea Challengers.   137 pp.

Best wishes,
Dave Behrens

Rudman, W.B., 2006 (Mar 7). Comment on Cuthona? from Japan by Sayoko Matsuda. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Cuthona sp. 8

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