Cadlina laevis from France

June 29, 2006
From: Wilfried Bay-Nouailhat

Dear Bill,

We've seen several specimens of this nudibranch. After a search in Sea Slug Forum, I think that it could be Cadlina laevis. Can you give me your opinion about it?

Locality: Laon Ejen Hir, Iles Glénan, Finistère Sud, 14 m, France, Atlantic Ocean, 18 June 2006, On rocks, . Length: 20 mm. Photographer: Wilfried Bay-Nouailhat.

Best wishes
Anne and Wilfried Bay-Nouailhat

Bay-Nouailhat, W., 2006 (Jun 29) Cadlina laevis from France. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Willy,
Yes this is Cadlina laevis. You will see from Bernard Picton's message [#4793 ] that there seem to be two colour 'forms' of this species, one with bright yellow spots and mantle border, and the other without.Yours, with pale milky yellow spots seems to be an intermediate form. Bernard notes that the yellow-spotted form usually eats the sponge Dysidea fragilis and lives sublittorally, while the other form feeds on Halisarca and lives intertidally. Interestingly, in one of your photos [lower right] there is a greyish sponge which could well be Dysidea, the food of the yellow-spotted form.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Jun 29). Comment on Cadlina laevis from France by Wilfried Bay-Nouailhat. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Cadlina laevis

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