Doto fragilis (Forbes, 1838)

20 December, 2012.
Dunollie, Oban on the west coast. 
8 mm and 3 mm animals on a hydroid at 12 m. Water temperature 9.5°C.
Sony NEX-5 in Nauticam housing, 18-55mm lens, SubSee +10 dioptre 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