Cuthona viridis from Massachusetts

June 21, 2002
From: Paul Young

My wife and I were recently diving at Back Beach in Rockport, Massachusetts. We found this critter in about 15' of water, on the same dive as the Doto. It was at approximately the same depth, in the same area. It is maybe 15mm long. We think it is a Coryphella. Photo by Paul Young


Young, P. , 2002 (Jun 21) Cuthona viridis from Massachusetts. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Paul,
This is Cuthona viridis which Alan Shepard has recently reported from Massachusetts. It has one of those cold temperate distributions like Flabellina verrucosa - the East coast of the USA, Greenland and the Arctic, and northeast Europe. The pigment in the digestive gland is normally more green than in this photograph, but the white splashes on the cerata are exactly right, as are the number and proportions of the cerata and the rhinophores and oral tentacles. I have also sent some photos of this species from the NE Atlantic for comparison.
best wishes,
Bernard Picton

Picton, B.E., 2002 (Jun 21). Comment on Cuthona viridis from Massachusetts by Paul Young. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Cuthona viridis

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