Amphorina linensis (Garcia-Gomez, Cervera & Garcia, 1990) 

21 October, 2015.
Cava Island, Scapa Flow in the Orkney Islands.
18 mm animal at 15 metres. Water temperature 11°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   sea slug forum