Doris pseudoargus (Rapp, 1827)

24 March , 2011.
Portencross Pier, Firth of Clyde on the west coast. 
Mating pair of 65 mm animals 'flammea' variety, on a pier leg at 5.5 m.
Water temperature 7°C.
Sony NEX-5 in Nauticam housing, 18-55mm lens and Inon D-2000 flash.

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