Colpodaspis pusilla M. Sars, 1870

5 September, 2018.
Rubh Ruadh, Loch Hourn, on the west coast. 
4 mm animal at 12 m.
Water temperature 13°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