Aeolidia papillosa (Linnaeus, 1761)

8 April, 2015.
Inverkip Pier, Firth of Clyde on the west coast.
A group of 5 animals 30 - 50 mm at 6 metres. Water temperature 8°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