Doris pseudoargus (Rapp, 1827)

18 October, 2014.
Eilean nan Coinean, Sound of Jura on the west coast. 
30 mm animal at 18 m. Water temperature 14°C.
Sony α6000  in Nauticam housing, 50 mm Zeiss 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