Favorinus branchialis (Rathke, 1806)

8 July, 2015.
Leehinish, Sandray in the Outer Hebrides on the west coast of Scotland.
28 mm animal at 14 metres. Water temperature 11°C.
Sony α6000  in Nauticam housing, 18-55 mm 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