Re: Blue chromodorid from Antibes

January 26, 2001
From: Angel Valdes

Dear Bill,

Please, find enclosed some comments on the photo in Erwin's message from Antibes, France you sent me, and a comparative photo [RIGHT] of H. villafranca.

The specimen from Antibes is a juvenile of Hypselodoris picta (Schultz in Philippi, 1836). There are several characteristics in this species that allow a positive identification. Hypselodoris picta is the only eastern Atlantic species of Hypselodoris, other than Hypselodoris villafranca, with more than two parallel yellow lines on the dorsum. Juvenile specimens have normally three lines, whereas in the adults the pattern is more complicated with numerous broken or entire lines. It is also characteristic of this species that two of the dorsal lines reach the rhinophoral sheaths. In adult specimens they form a yellow circle around the edge of the rhinophoral sheath and continue forward. In juvenile specimens, like this in the picture, the yellow circles are not formed yet. In addition, juvenile specimens have the mantle margin is surrounded by a white area. The dorsal yellow lines of both juveniles and adults reach the gill sheath but they never form a circle around it.

Hypselodoris villafranca (Risso, 1818) is another dark blue species with several dorsal yellow or white lines, but generally they form an irregular pattern, something like a broken network. In some small adults of H. villafranca, there may be three parallel lines too, but this species is easily distinguished from H. picta by the greyish coloration of the gill and rhinophores and the presence of a white line on the rhinophores (see photo enclosed). Also, in H. villafranca the dorsal yellow lines form a circle around the branchial sheath.

Other distinctive features of H. picta are the uniformly dark blue rhinophores, with no yellow or white pigment, and the branchial leaves with the external rachis yellow.

All the best,
Angel

avaldes@CalAcademy.org

Valdes, A., 2001 (Jan 26) Re: Blue chromodorid from Antibes. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3634

Thanks Angel,
Bill Rudman

Factsheet

Hypselodoris picta

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