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Goniobranchus sp. 01  Genus: Pease, 1866

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Goniobranchus sp. 01 can be distinguished by the whitish-tan gills and rhinophores, by the purple mantle margin, and the general body colour pattern. This species is one of few species which lifts the whole of the mantle edge at the same time, like Goniobranchus coi and Goniobranchus kuniei, other species flap only the anterior mantle skirt up and down, that are Goniobranchus geometricus and Goniobranchus hintuanensis.
It was posted on 23 May 2003 at these websites as Chromodoris sp. A  Genus: Alder & Hancock, 1855,
then changed into Chromodoris sp. 01  Genus: Alder & Hancock, 1855,
for some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I have chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
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 sp. 01 to the reerected ("rescued from synonymy") genus Goniobranchus  Pease, 1866, on which Rebecca and Terry state: "This clade includes all of the Indo-Pacific species of Chromodoris that are not part of the black-lined, planar egg mass clade, except Chromodoris alternata and Chromodoris ambiguus."
More information on Goniobranchus sp. 01 as Chromodoris sp. 13 are on Bill Rudman's Sea-Slug Forum!