Ancula gibbosa (Risso, 1818)

2 September, 2016.
Fast Castle, St Abbs on the east coast .
10 mm animal at 15 metres. Water temperature 12°C.
Sony α6000  in Nauticam housing, 50 mm Zeiss 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