Acanthodoris pilosa (Abildgaard in Müller, 1789)

24 June, 2015.
Auliston Cliff, Loch Sunart on the west coast .
55 mm, one of 4 seen with spawn, at 12 metres.
Water temperature 10°C.
Sony α6000  in Nauticam housing, 18-55 mm 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