Onchidoris bilamellata (Linnaeus, 1767)

21 August, 2014.
The Rondo wreck, Sound of Mull on the west coast.
Unusually pale animal approx 15 mm at 18 m among the continuing spawning aggregation on the wall near the wreck. Water temperature 13°C.
Sony α6000  in Nauticam housing, 18-55mm lens, SubSee +10 dioptre 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