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Hypselodoris tryoni (Garrett, 1873) [Goniodoris]

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Hypselodoris tryoni is characterized by a high shape of the body with a reduced mantle overlap. There is a group of similarly coloured species which Bill Rudman called the "Hypselodoris tryoni colour group". They all have large purple or purple-brown spots or marks, usually ringed with white, an often reticulate brownish background, and a purple border:
Chromodoris geminus which has four colour bands around the mantle edge: an outermost white, then translucent greyish purple, then white, then yellow. It has a wide mantle overlap.
Goniobranchus kuniei which has a broad purple line at the border of the mantle and a wide mantle overlap.
Goniobranchus leopardus which has leopard-like multiple spots, or marks, forming a hollow squarea, distinct purple line at the border of the mantle and a wide mantle overlap.
It was posted on 25 July 2003 at these websites as Risbecia tryoni (Garrett, 1873) [Goniodoris],
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 Risbecia tryoni to the genus Hypselodoris  Stimpson, 1855.
More information on Hypselodoris tryoni as Risbecia tryoni are on Bill Rudman's Sea-Slug Forum!