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

[2] This species was described from the Sudanese Red Sea and Tanzania with the type locality being Dar Es Salaam.

It is white in colour with a yellow, ruffled, margin to the mantle.

The gills and rhinophores are white with bright red lines.

Thorunna africana feeds on sponges of the genus Dysidea.