Hypselodoris tricolor from Croatia

October 7, 2003
From: Adam Petrusek

Dear Bill,
To accompany my earlier message here are photos of a dorid from Vrulja, on Makarska Riviera, Adriatic Sea, Croatia, on September 16, 2003.

Two show the species during and after mating
depth 31 m. The lower right showa one small (1 cm) dorid on Reniera fulva
depth ~20 m

I guess they are some Chromodoris(?)
Thanks for any help identifying them.
Adam Petrusek

petrusek@cesnet.cz

Petrusek, A,, 2003 (Oct 7) Hypselodoris tricolor from Croatia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11143

Dear Adam,
These are one of the famous 'blue hypselodorids which are found in the Mediterranean and nearby Atlantic. They have caused many identification problems over the years so I am hesitant to identify them from so far away. However I am pretty sure these animals are Hypselodoris tricolor. This species seems to feed specifically on species of the sponge genus Dysidea so it is possible that rather than being interested in the reddish Reniera in your photo, the single animal is interested in the greyish sponge in the upper half of the photo which could be a species of Dysidea.

We still have much to learn about colour variation in this group of species, so photos of different sized animals, of them feeding and of them laying eggs would be very valuable additions to the Forum
Best wishes
Bill Rudman

Rudman, W.B., 2003 (Oct 7). Comment on Hypselodoris tricolor from Croatia by Adam Petrusek. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11143

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