Facelina auriculata (Müller, 1776)

4 December, 2016.
Bach Island, Firth of Lorne on the west coast of Scotland.
20 mm animal at 13 metres. Water temperature 10° 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