Geitodoris planata (Alder & Hancock, 1846)

29 October, 2014.
Seven Step Reef, Loch Creran on the west coast. 
30 mm animal on queen scallop, Aequipecten opercularis, at 16 m. Queen scallops are abundant at this site generally below 8 m and many had these hitch hikers. Water temperature 12°C.
Sony α6000  in Nauticam housing, 50 mm Zeiss 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