Geitodoris planata (Alder & Hancock, 1846)

6 March 2013.
Inverkip Pier, Firth of Clyde on the west coast.
55 mm animal on wreckage at 8 m. Water temperature 6.5° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens and Inon D-2000 flash.

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

 nudibranchs of the british isles sea slug forum