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It is Paradoris sp. B in
Dayrat, B. (2006) A taxonomic revision of Paradoris sea slugs (Mollusca, Gastropoda, Nudibranchia, Doridina). Zoological Journal of the Linnean Society, 147 (2): 125-238
There are pictures of it at NUDIPIXEL from Taiwan, Indonesia, and the Seychelles, at the Sea-Slug Forum from South Africa and from the Marshall Islands.
More information on Paradoris sp. 02 as Paradoris sp. 1 are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 16 March 2018, Paradoris sp. 02 Genus: Bergh, 1884
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Paradoris_sp_02.htm