Okenia nodosa (Montagu, 1808)

19 February, 2012.
Piggery, Loch Fyne on the west coast.
At 7 metres with several 25 mm aimals nearby. Water temperature 8° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens with Subsea + 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