Re: Food of Tritonia nilsodhneri

October 24, 2001
From: Helmut Zibrowius

Dear Bill,
At Bernard Picton's request I have had a look at the gorgonians in the Forum on which Tritonia nilsodhneri has been photographed and suggest the following identifications. I have sent a separate message concerning the gorgonians that Marionia blainvillea has been photographed on.

• The gorgonian in Erwin Koehler's photo from Cala Joncols is Eunicella singularis
(the expanded polyps show zooxanthellae pigmentation), bark is whitish.
• The gorgonian in Bernard Picton's photo from Galicia, Spain is, as suggested by Bernard, a species of Leptogorgia.
• I am not an expert on North Atlantic gorgonians but in spite of colour differences
I think all the photos in Bernard Picton's message from England and the Channel Ids could be Eunicella verrucosa.
• I agree with Baki Yokes' identification of the gorgonian in his photo from Saros Bay, Turkey as a whitish form of Eunicella singularis (but mostly contracted; when polyps are out, they look whitish - E. singularis also can occur without zooxanthellae; this may be the case here).

There is plenty of information on the genus Leptogorgia in:
Grasshoff M., 1992. Die Flachwasser-Gorgonien von Europa and Westafrika (Cnidaria, Anthozoa). Courier Forschungsinstitut Senckenberg, 149: 135pp.

Helmut Zibrowius
Centre d'Oceanologie de Marseille Station Marine d'Endoume
Marseille
France

hzibrowi@com.univ-mrs.fr

Zibrowius, H., 2001 (Oct 24) Re: Food of Tritonia nilsodhneri. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5511

Thanks Helmut,
It is often very difficult to get the food of nudibranchs identified unless you manage to diligently photograph, collect and correctly preserve the specimen and know a reliable expert in the relevant group of animals who has the time to help. So any help you can provide with identifications, will be gratefully received.
Best wishes,
Bill Rudman.

Rudman, W.B., 2001 (Oct 24). Comment on Re: Food of Tritonia nilsodhneri by Helmut Zibrowius. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5511

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