‘Montereina’ hispida (d'Orbigny, 1837) [Doris]
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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  Odhner 1934
Superfamily: Doridoidea  Rafinesque, 1815
Family: Discodorididae  Bergh, 1891
Genus: ‘Montereina’  MacFarland, 1905
Species: ‘Montereina’ hispida (d'Orbigny, 1837) [Doris]

Concerning the change to Diaulula have a look at
Bill Rudmans Seaslug Forum
or at
Valdés, A. & Gosliner, T. M. (2001) Systematics and phylogeny of the 
caryophyllidia-bearing dorids (Mollusca, Nudibranchia), with the description 
of a new genus and four new species from Indo-Pacific deep waters. 
Zoological Journal of the Linnean Society, 133: 103-198.---
or at
Valdés, A. 2002. A phylogenetic analysis and systematic revision of the cryptobranch dorids (Mollusca, Nudibranchia, Anthobranchia). Zoological Journal of the Linnean Society, 136: 535-636.

I place it in ‘Montereina’  according to: 
Dayrat, B. 2010. A Monographic Revision of Basal Discodorid Sea Slugs (Mollusca: Gastropoda: Nudibranchia: Doridina). Proceedings of the California Academy of Sciences 61, suppl I: 1-403. 

formerly placed in the Order: NUDIBRANCHIA, in the Subclass: OPISTHOBRANCHIA
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‘Montereina’ hispida

Southeastern
Pacific Ocean
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