Colpodaspis pusilla M. Sars, 1870

23 August, 2015.
4.5 m Rock, Loch Nevis on the west coast. 
4 mm animal at 12 m. Water temperature 13.5°C.
Sony α6000  in Nauticam housing, Zeiss 50 mm macro lens and 2 x Inon D-2000 flashes.
for more information about this species go to one of the links below
OPK - Opistobranquis Encyclopedia of Marine Life of Britain and Ireland Sea Slug Forum