October 15, 2008
From: Mark Warren
Please find attached picture of critter spotted on Sea search week based on St Martins in the Isles of Scilly - UK last week. Despite having numerous books with us we were unable to determine a name for this little (well comparatively not that little) critter and were wondering if you could proffer a name?
Locality: 'Dry Ledge' St Marys, 20 metres approx, Isles of Scilly, United Kingdom, Atlantic, 9th October 2008, Weeded alcove in rock outcrop. Length: 25 mm. Upper two photos: Mark Warren. Lower photo: Anna Cawthray.
email@example.comWarren, M., 2008 (Oct 15) First record of Discodoris rosi from the UK. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21943
This is Discodoris rosi. It has never been recorded north of the French Coast before, so this is quite exciting. It is a fairly large and conspicuous nudibranch so I suspect that we are seeing a true range extension here. Sally Sharrock, who was leading your trip, sent me another picture of the same species taken by Anna Cawthray, so there seems to be a population there, not just a chance individual.
The Scilly Isles are probably one of the places we can expect species crossing the English Channel to be seen first, if global warming continues to affect the North Atlantic by warming it. It was first described from Galicia, NW Spain as recently as 1979, indeed I saw it there myself in 1978. At the time I identified the sponge it was feeding on as Microciona strepsitoxa, a red encrusting sponge on which it is reasonably well camouflaged. I suspect that is the sponge in Anna's picture. Since then it has been reported from a few scattered sites throughout the Mediterranean Sea and here on the Forum as far north as Belle-Ile in Southern Brittany. The sponge seems to have a more northerly distribution in Britain and Ireland, so perhaps that made it possible for the nudibranch larvae to get started once they had somehow crossed the English Channel.
Re: First record of Discodoris rosi from the UK
From: David Kipling, October 1, 2009
Re: Discodoris rosi from French Mediterranean
From: M. Poddubetskaia Ossokine, April 2, 2009
Re: Discodoris rosi laying egg mass ribbon
From: Dominique Horst, March 10, 2009
Re: Discodoris rosi from the french Mediterranean
From: Dominique Horst, March 2, 2009
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Re: Discodoris rosi from nthn Spain
From: Alma Sanchez, March 1, 2004
Discodoris rosi from nthn Spain
From: Ricardo Roberto Fernández, February 27, 2004
Discodoris rosi from French Brittany
From: Marina Poddubetskaia, September 27, 2002