Trapania nebula is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.[1]
This species was described from Madang, Papua New Guinea.
This goniodorid nudibranch is translucent grey-brown with an irregular pattern of white covering most of the body. The rhinophores and gills are edged with yellow or orange.[2]
Trapania nebula probably feeds on Entoprocta which often grow on sponges and other living substrata.