Spurilla chromosoma not S. neapolitana from Japan

March 19, 2000
From: Y. Hirano

Dear Bill,
I had a look at the recent messages about an aeolid nudibranch from Japan which could be Spurilla neapolitana.

I think I have often collected specimens of this species and I am quite sure it is Aeolidiella chromosoma (Cockerell & Eliot, 1905). I dissected the specimens and found good morphological characters with which I can identify them as the species.

I reported this at the annual conference of the Japanese malacological Society held a year ago, as one species of species list newly found from Japan. I do not know whether the species was introduced to Japan from the east Pacific coast, or whether it was originally native to Japan. Anyway there is not yet any information on the species on the illustrated books or papers so far published in Japan.

The body colour is quite variable depending on specimens from vermilion, dull orange to thin cream yellow. They are usually found from underside of large boulders in the intertidal zone. It does not seem to be uncommon in Japan. I have attached a photo for the forum.

Data: October 28, 1996. Intertidal of Kominato coast, Boso Peninsula, Japan. Body length 25 mm. Rhinophores lamellate. PHOTO: Yoshi J. Hirano.

Very best wishes,
Yoshi

hiranoyj@earth2.s.chiba-u.ac.jp

Hirano, Y., 2000 (Mar 19) Spurilla chromosoma not S. neapolitana from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2121

Dear Yoshi,
Thank you very much for the photo and the information. I have had a look at the published descriptions of S. neapolitana and S. chromosoma and can't see too many differences other than Ernst Marcus (1961) saying that the anterior ceratal cluster on each side in S. chromosoma consisted of about 4 rows as compared with the single rowed arch in S. neapolitana. It would be interesting to have some input from anyone familiar with S. chromosoma in its 'home territory'.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Mar 19). Comment on Spurilla chromosoma not S. neapolitana from Japan by Y. Hirano. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2121

Factsheet

Spurilla chromosoma

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