Goniobranchus coi (Risbec, 1956) [Glossodoris]

Click the thumbnail photos to enhance!

Goniobranchus coi cannot be mixed up with other chromodorids, it's ornaments are unique. It is characterized by its yellowish tan body with a central area of tan-rose to dull brown, sometimes with a darker mottling. The central area is surrpounded by undulating black and white lines. The mantle has a thin purple marginal line, submarginal is a diffuse whitish band merging into a broad diffuse band of the same colour as the cetral area, which merges into the yellowish tan colour of the body. The underside of the anterior end of the mantle is deep purple. As the animal crawls along it flaps the whole mantle edge rhythmically up and down, as can be clearly seen in the pictures #6 and #8.
It was originally posted at these websites as Chromodoris coi (Risbec, 1956) [Glossodoris],
I follow the recent article (published: 10 April 2012)
Rebecca Fay Johnson & Terrence M. Gosliner. 2012.
Traditional Taxonomic Groupings Mask Evolutionary History:
A Molecular Phylogeny and New Classification of the Chromodorid Nudibranchs. online at
and move Chromodoris coi to the reerected ("rescued from synonymy") genus Goniobranchus  Pease, 1866.
More information on Goniobranchus coi as Chromodoris coi are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 3 January 2016, Goniobranchus coi (Risbec, 1956)
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Goniobranchus_coi.htm