Thorunna punicea is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.

[2] This species was described from Passe de Koumac, New Caledonia, 20°40.7′S 164°14.7′E / 20.6783°S 164.2450°E / -20.6783; 164.2450.

[3] This species is similar in coloration to Hypselodoris melanesica and Mexichromis albofimbria.

It has a purple mantle with a thin white margin and darker purple bases to the rhinophores and gills.