Knoutsodonta depressa (Alder & Hancock, 1842)

24 June, 2015.
Auliston Cliff, Loch Sunart on the west coast.
5 mm animal on an encrusting bryozoan at 16 metres. Water temperature 10°C.
Sony α6000  in Nauticam housing, 18-55 mm lens, Nauticam CMC-1 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