Goniobranchus pruna is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.Bouchet, P. (2015). Goniobranchus pruna (Gosliner, 1994). In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-11-19
Distribution This species was described from two specimens measuring and found at Nosy Tanikely, Madagascar and Park Rynie, Natal, South Africa. It has been reported from Nosy Bé, Madagascar.
Description The mantle of Goniobranchus pruna is mostly light grey, with dark plum or black spots and a broad white band at the margin overlain with large round orange spots at regular intervals.Gosliner, T.M., Behrens, D.W. & Valdés, Á. (2008) Indo-Pacific Nudibranchs and seaslugs. A field guide to the world's most diverse fauna. Sea Challengers Natural History Books, Washington, 426 pp. page(s): 228 Individuals of may develop a patch of cream with brown spots behind the rhinophores and just in front of the gill circlet. The rhinophores and gills are translucent with some orange pigment and small white spots.Bidgrain, P., 2018. Goniobranchus pruna Southwest Indian Ocean Sea Slugs and Flatworms, accessed 2019-01-14.
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