Onchidoris bilamellata (Linnaeus, 1767)

6 December, 2014.
Lephinchapel, Loch Fyne on the west coast .
Breeding aggregation of 15 - 25 mm animals between 19 - 23 metres. Water temperature 11°C.
Sony α6000  in Nauticam housing, 50 mm Zeiss Touit 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