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/14085Dear 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
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