Berthella sp ? from Mediterranean

April 18, 2005
From: Sylvie Grall

Dear Bill,
I have doubts about this yellow Berthella I found in the Etang de Thau (april 2004). Could it be Berthellina citrina? What is the difference between Berthella and Berthellina?

Locality: Etang de Thau. France. Mediterranean. Depth: 5 m. Length: 30 mm. 2 April 2005. Pillars. Photographer: Sylvie Grall

Thank you for your help.

Grall, S., 2005 (Apr 18) Berthella sp ? from Mediterranean. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Sylvie,
I am afraid this could be one of a number of yellowish pleurobranchs known from Europe. There is quite a correspondence on the Forum about this [see Lucas Cervera's message #8145 for an idea of the problem]. The only simple difference is the size of the fragile internal shell - large in Berthella, small in Berthellina - but that is not obvious in photos or live animals.  So unfortunately in this case I have to admit total defeat
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Apr 18). Comment on Berthella sp ? from Mediterranean by Sylvie Grall. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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