Hero formosa (Loven, 1841)

3 February, 2013.
Stallion Rock, Loch Fyne on the west coast.
A 12 mm long animal found at 16 metres, collected and photographed later in the lab.
Water temperature 8° C.
Sony NEX-5 with 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
  nudibranchs of the british isles sea slug forum