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Goniobranchus collingwoodi (Rudman, 1987) [Chromodoris]

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Goniobranchus collingwoodi is characterized by a large central reddish / orange-brown patch extending from in front of the rhinophores to just behind the gills. This patch has fine white specks all over. The mantle has a purple border of irregular width. Inside this is a broad white region with many bright yellow spots scattered over the outer half and dark purple spots. The rhinophore stalk is translucent and the club is a dark reddish brown with white specks along the edge of the lamellae and a white tip. The gills are translucent with a dark brown line down the two edges of each of the outer and inner sides.
Pretty similar are:
Goniobranchus aureopurpureus which differs by having no central reddish patch. Its mantle is white with yellow to dull brown irregular spots all over the central region. At the edge of the mantle is a band of diffuse watery purple and on its inside edge is a submarginal band of large deep purple spots. The rhinophore clubs are heavily pigmented with purple or reddish brown and edged in white. The gills are translucent purple or red-brown, and also edged with white. which differs by its large central reddish / orange-brown patch, and irregular purple border of the mantle, then a broad region in which there are small yellow and larger purple spots.
Goniobranchus tennentana (Chromodoris tennentana) which has also a large central reddish / orange-brown patch but differs by its bluish purple border of the mantle, the white region inside it has yellow spots. It also differs by its large purple spots each surrounded by a white ring restricted to the central patch.
Goniobranchus rufomaculatus which differs by its translucent white gills which are edged in opaque white, and lacks the central reddish / orange-brown patch.
This species was posted on 6 January 2010 at these websites as Chromodoris collingwoodi  Rudman, 1987,
R.F. Johnson & Gosliner (2012) moved it to the reerected ("rescued from synonymy") genus Goniobranchus  Pease, 1866.
Reference:
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
More information on Goniobranchus collingwoodi as Chromodoris collingwoodi are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 29 April 2017, Goniobranchus collingwoodi (Rudman, 1987)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Goniobranchus_collingwoodi.htm