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Goniobranchus geometricus (Risbec, 1928) [Chromodoris]

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Goniobranchus geometricus is a smaller chromodorid, 3 cm specimens are large. It has a fairly large anterior mantle skirt which waves up and down as the animal crawls along and is purple on its underside. This is a 4-6 mm juvenile specimen with orange pigment on the outer half of the rhinophores and gills, not greenish as in adults.
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
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0033479
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!