Doris pseudoargus (Rapp, 1827)

26 April, 2015.
Finnart Pier, Loch Long on the west coast.
33 mm animal at 10 metres. Water temperature 6°C.
Sony α6000  in Nauticam housing, 50 mm Zeiss Touit 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