Trinchesia phoenix (Gosliner, 1981) [Cuthona]
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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: Dexiarchia  Schrödl, Wägele & Willan, 2001
Infraorder: Aeolidida  Odhner, 1934
Superfamily: Aeolidioidea  J.E. Gray, 1827
Family: Tergipedidae  Bergh, 1889
Genus: Trinchesia  von Ihering, 1879
Species: Trinchesia phoenix (Gosliner, 1981) [Cuthona]

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

Originally posted at these websites as 
Cuthona phoenix  Gosliner, 1981
according to 
Miller, M.C. 2005. An appraisal of the identity of the New Zealand species of the aeolid nudibranch family Tergipedidae (Gastropoda: Opisthobranchia). Journal of Natural History 38: 1183-1192. 
has the genus Cuthona only one species: Cuthona nana (Alder & Hancock, 1842)
let me quote from the last sentence of the abstract:
"As a result the genus Cuthona Alder & Hancock, 1855 is restricted to one species, C. nana (Alder & Hancock, 1842), and the genus Trinchesia von Ihering, 1879 is re-introduced for the rest of the species previously included in Cuthona."
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Trinchesia phoenix

Eastern Pacific Ocean
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