Antiopella cristata (delle Chiaje, 1841)

25 June, 2015.
Calve Island, Sound of Mull on the west coast.
2 x 55 mm animals mating at 16 metres with 3 other large animals nearby. Water temperature 10°C.
Sony α6000  in Nauticam housing, 18-55 mm 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