Onchidoris bilamellata (Linnaeus, 1767)

21 June, 2016.
Wuddy Rocks, St Abbs on the east coast.
6 mm animal at 16 metres. Water temperature 10C.
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