Facelina auriculata (Müller, 1776)

8 April, 2018.
Elizabeth Rock, Arnamurchan on the west coast .
15 mm animal at 22 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