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Pretty similar are:
Goniobranchus hintuanensis which differs by the plum colour of the rhinophores and gills and the presence of a few small white rounded nodules on the mantle, each surrounded by a ring of deep magenta, purple or black, and
Chromodoris conchyliata which differs by the reddish colour of the rhinophores and gills and is only reported from the Indian Ocean.
It was posted on 22 Apr. 2003 at these websites as Chromodoris geometrica Risbec, 1956,
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 geometrica to the reerected ("rescued from synonymy") genus Goniobranchus Pease, 1866.
More information on Goniobranchus geometricus as Chromodoris geometrica are on Bill Rudman's Sea-Slug Forum!