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Tayuva lilacina was originally posted at these websites as Discodoris lilacina, that is the name most authors used, though it is known under a variety of different names. Dayrat (2010 moved it into the genus Tayuva Er. Marcus & Ev. Marcus, 1967
This species is very similar to Sebadoris fragilis (Alder & Hancock, 1864) [Doris] and is also known under a variety of different names. Externally they differ by their sizes, Tayuva lilacina is usually much smaller, seldom larger than 4 cm, Sebadoris fragilis grows up to 12 cm, Dayrat (2010) writes "If preseved specimens measure more than 60 mm they have little chance to be part of lilacina". Both species are very variable and/or part of a species complex.
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.
More information on Tayuva lilacina as Discodoris lilacina are on Bill Rudman's Sea-Slug Forum!