Fjordia browni (Picton, 1980)

24 March , 2011.
Portencross Pier, Firth of Clyde on the west coast. 
15 mm animal with a barnacle feeding behind on a pier leg at 5.5 m.
Water temperature 7°C.
Sony NEX-5 in Nauticam housing, 18-55mm lens, Subsee +10 dioptre and Inon D-2000 flash.

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