Trinchesia caerulea (Montagu, 1804)

January 1998.
These lovely little animals can regularly be found on the old cable at South Gortein in Loch Fyne on the west coast. I have only ever seen them on this hydroid (Sertularella polyzonias?).

for more information about this species go to one of the links below
scottish nudibranchs

 nudibranchs of the british isles sea slug forum