Acanthodoris pilosa (Abildgaard in Müller, 1789)

23 October, 2011.
12.9 Mile mark, Loch Fyne on the west coast. 
8 mm juvenile and even smaller <3 mm animals on bryozoan Alcyonidium diaphanum at 14 m. Water temperature 12°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