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Goniobranchus preciosus (Kelaart, 1858) [Doris]

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Goniobranchus preciosus is characterized by a white mantle with an outer pale blue, then brownish red and an inner orange/yellow border. The gills and rhinophore clubs are translucent red with pigmented white edging to the lamellae. The mantle can be clear white or can have a lot of small brown patches. This shot shows 2 specimens mating.
Pretty similar are:
Goniobranchus verrieri which lacks the outer blue line, and
Goniobranchus albonares which has white gills and relatively large white rhinophores, and lacks also the outer blue line.
It was posted on 12 Aug. 2003 at these websites as Chromodoris preciosa (Kelaart, 1858) [Doris],
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 preciosa to the reerected ("rescued from synonymy") genus Goniobranchus  Pease, 1866.
More information on Goniobranchus preciosus as Chromodoris preciosa are on Bill Rudman's Sea-Slug Forum!