Cuthona concinna from Nova Scotia, Canada

March 12, 2003
From: Alan Shepard

Bill -
Apologies for the quality of this photo but the identification of these nudibranchs is puzzling me.

The photo was taken on the artificial reef, HMCS Saguenay, off Lunenburg, Nova Scotia, Canada this past summer. The wreck is covered in hydroids, sponges, anemones (M. senile) and nudibranchs. These two nudibranchs were at a depth of about 22 meters. They were not large, maybe 15 millimeters at best.

I did a bit of looking around and from Bernard Picton's book, A Field Guide to the Nudibranchs of the British Isles, they seem to match Cuthona concinna. Bernard's book says the key characteristics are grey digestive gland in the cerata and white pigment on the cerata and head tentacles. He also lists Sertularia argentea as its food source. I'm not familiar with hydroids so I don't know if that is the hydroid they are perched on. Any help you can provide would be appreciated
Alan Shepard

Shepard. A., 2003 (Mar 12) Cuthona concinna from Nova Scotia, Canada. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Alan,
They certainly look like cuthonids, and could easily be Cuthona concinna. Hopefully Bernard can confirm the id or correct it for us
Best wishes,
Bill Rudman


Cuthona concinna

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