Microchlamylla gracilis (Alder & Hancock, 1844)

29 March, 2015.
Glas Eilean, Loch Fyne on the west coast .
25 mm specimens on hydroid at 19 metres. Several seen with spawn.
Water temperature 7°C.
Sony α6000  in Nauticam housing, 50 mm Zeiss lens and Sola 1200 video light.

for more information about this species go to one of the links below
OPK - Opistobranquis nudibranchs of the british isles sea slug forum