Trapania sanctipetrensis is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.[1]
This species was described from Sancti-Petri, Chiclana de la Frontera, Bay of Cadiz, south west Spain.
The body of this goniodorid nudibranch is translucent white with a network of brown markings on the surface. The gills, oral tentacles and tail are tipped with white pigment.[2]
Trapania sanctipetrensis probably feeds on Entoprocta which often grow on sponges and other living substrata but it was found on Bugula neritina.