Hypselodoris tryoni (Garrett, 1873) [Goniodoris]
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Taxonomy:
Class: Gastropoda  Cuvier, 1797
Subclass: Heterobranchia  J.E. Gray, 1840
Clade: Euthyneura  Spengel, 1881
Clade: Nudipleura  Wägele & Willan, 2000
Order: Nudibranchia  Cuvier, 1817
Suborder: Euctenidiacea  Tardy, 1970
Infraorder: Doridacea  Thiele, 1931
Superfamily: Doridoidea  Rafinesque, 1815
Family: Chromodorididae  Bergh, 1891
Genus: Hypselodoris  Stimpson, 1855
Species: Hypselodoris tryoni (Garrett, 1873) [Goniodoris]

formerly placed in the Order: NUDIBRANCHIA, in the Subclass: OPISTHOBRANCHIA

have a look at:
Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). 
"Classification and nomenclator of gastropod families". 
Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1–397. 
ISBN 3925919724. ISSN 0076-2997. 

Originally posted at these websites as Risbecia tryoni (Garrett, 1873) [Goniodoris] ,
I follow 
Rebecca Fay Johnson & Terrence M. Gosliner. 2012. 
Traditional Taxonomic Groupings Mask Evolutionary History: 
A Molecular Phylogeny and New Classification of the Chromodorid Nudibranchs. completely online at
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0033479
and move Risbecia tryoni to the genus Hypselodoris  Stimpson, 1855.
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