Aeolidia papillosa (Linnaeus, 1761)

4 May, 2011.
Inverkip Pier, Firth of Clyde on the west coast.
20 animals, at least, feeding on fallen plumose anemones below the pier at 17 m. There were hundreds around the bottom and pier legs at this depths with large 120 mm animals. Water temperature 9° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens and 2 x Inon D-2000 flashes.

for more information about this species go to one of the links below
OPK - Opistobranquis nudibranchs of the british isles sea slug forum