Mexichromis francoisae from Senegal

April 18, 2003
From: Marina & Patrice

Dear Bill,
I have some difficulties identifying these blue dorids from Dakar, Senegal. They seem to me rather different from usual Hypselodoris tricolor. Could it be Hypselodoris gasconi Ortea, 1996 ?

These photos were taken by Patrice Petit de Voize on the Tacoma wreck in April 1999, at a depth of 10m.

Best wishes,
Marina Poddubetskaia
Patrice Petit de Voize

Dear Marina & Patrice,
I think we all have problems with the 'blue chromodorids' of the Mediterranean and nearby Atlantic coasts. I guess that's what makes them so interesting. Hypselodoris gasconi, apart from only being known from the Mediterranean, has a white line along the edge of each gill and a white line along the posterior midline of the rhinophore club. Having said that, the only way to be 100% sure would be to check its anatomy. I am pretty sure Patrice's photos are of Mexichromis francoisae which was first described from Senegal and later (Ortea, 1988) from the Cape Verde Archipelago.
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Apr 18). Comment on Mexichromis francoisae from Senegal by Marina & Patrice . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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