Hypselodoris tricolor or H. fontandraui

June 24, 2005
From: Sylvain Le Bris

Dear Bill,
Please can you help me to identify these Hypselodoris. I think it is H. orsinii (on right) but for the other (on left) I wonder if it is H. fontandraui or H. tricolor?

These species are common in the Marseille area and each time I have the same problem for identification

Locality: Planier Island, Marseille. France. Mediterranean Sea. Depth: 14 m. Length: 12 mm. 19 June 2005. Photographer: Sylvain Le Bris

Thanks for your help
Sylvain Le Bris

sylvain.lebris@freesbee.fr

Le Bris, S., 2005 (Jun 24) Hypselodoris tricolor or H. fontandraui. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14085

Dear Sylvain,

The one on the tight is H. orsinii. It feeds on the sponge Cacospongia, which is what it is crawling on. In an  earlier message [#7383], Jean-Pierre Bielecki  notes that this species could be distinguished by minute tubercles on the back, which you can clearly see them in your photo alongside.

I am sure the other species if H. tricolor, but as it feeds exclusively on species of Dysidea, I am puzzled tp see it by Cacospongia. Perhaps you have placed by it by the H. orsinii for this photo?

Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Jun 24). Comment on Hypselodoris tricolor or H. fontandraui by Sylvain Le Bris. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14085

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Hypselodoris tricolor

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