Hero formosa (Loven, 1841)

10 January, 2013.
Lephinchapel Reef, Loch Fyne on the west coast.
A 18 mm long animal at 18.8 metres on the reef to the north of the main reef.
Water temperature 9° C.
Sony NEX-5 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
  nudibranchs of the british isles sea slug forum