Ancula gibbosa (Risso, 1818)

31 August, 2014.
The Piggery, Loch Fyne on the west coast .
15 mm animal on hydroid at 16 metres.
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