Cyerce cristallina from Formiche di Grosseto

September 3, 2007
From: Elisabetta Guerrini

Dear Bill,
Thanks a lot for your opinion [message #20535 ]!
I'm sure you're right especially after I've seen the pictures in this message that Diego kindly forwarded me.

Locality: Formiche di Grosseto, 7.2 m, Italy, Tyrrhenian Sea, 19 August 2007. Length: about 4 cm. Photographer: Diego Daroczy

The "curled" cerata and the brown shade gave me the wrong impression that it could be more similar to a Polybranchia than a Cyerce cristallina, but looking carefully to these new images we can see a darker coloration of the two upper branches of the bifid rinophores, recognize a light-red patch at the tip of some ceras, the tiny white dots on the ceratal edge and admire the huge quantity of bright orange spots!
Friendly regards.


Guerrini, E., 2007 (Sep 3) Cyerce cristallina from Formiche di Grosseto . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Lisa,
From my reading of the scientific literature I can't find any mention of the yellow-orange spots which link the animals with red marks and those without red marks. I would be interested in some comments from local experts

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Sep 3). Comment on Cyerce cristallina from Formiche di Grosseto by Elisabetta Guerrini. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Cyerce cristallina

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