Acanthodoris pilosa (Abildgaard in Müller, 1789)

7 April, 2018.
Rubh Ruadh, Loch Hourne on the west coast .
25 mm animal at 16 metres
Water temperature 5°C.
Sony α6000  in Nauticam housing, Zeiss 50 mm macro 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