Onchidoris bilamellata (Linnaeus, 1767)

14 September, 2003.
Eilean Balnagowan Island, Loch Linnhe on the west coast.
Water temperature 14° C. On the west side of the island, from 8 to 22 metres there were many patches of spawn and many animals, part of the mass spawning event seen two weeks previously on the east side of the island.
Olympus C-2020Z in Olympus PT-010 housing with Nikonos 105 flash .

for more information about this species go to one of the links below
OPK - Opistobranquis

 nudibranchs of the british isles sea slug forum