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Goniobranchus setoensis (Baba, 1938) [Glossodoris]

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Goniobranchus setoensis is characterized by a translucent greyish body with an orange-brown mantle margin. There is a thin opaque white line encircling the mid-dorsal region, running from the rhinophores parallel to the mantle margin, behind the gills to the other rhinophore. A medial thin opaque white line forms a "Y" just in front of the translucent gills. Submarginal are large purple and minute opaque whit spots. There are no purple spots in the greyish mid-dorsal region, which is encircled by a opaque white line.
This picture shows a 3 mm juvenile specimen.
Very similar is Goniobranchus decorus (Pease, 1860) which differs by having purple spots also in the greyish mid-dorsal region, and by having purple spots in the white 'Y".
The Sea-Slug Forum lists both species as Chromodoris decora and dicusses the colour variations at Identity of Chromodoris decora , let me quote:"..all these forms seem to represent variations of one species." and "Baba himself (1953) suggested it should be considered a synonym of C. decora."
IPN lists them seperate with the comment: "Additional work is necessary to determine whether these are color variants or distinct species."
Scott and Jeanette Johnson discuss it at Underwater Kwajalein with many pictures, they think these species to be distinct.
I follow IPN and post it as Goniobranchus setoensis (Baba, 1938) [Glossodoris].
It was posted on 17 July 2011 at these websites as Chromodoris setoensis (Baba, 1938) [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
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0033479
and move Chromodoris setoensis to the reerected ("rescued from synonymy") genus Goniobranchus  Pease, 1866.
More information on Goniobranchus decorus as Chromodoris decora are on Bill Rudman's Sea-Slug Forum!