Trevelyana ceylonica Kelaart, 1858 (basionym) Gymnodoris ceylonica is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae.

[2][3] This species occurs in the tropical Indo-Pacific Ocean.

[3] Gymnodoris ceylonica has a translucent white body which is covered with many orange spots.

It has translucent orange-lined white gills and orange rhinophores.

The foot is translucent white and edged with an orange margin.