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This species is Eubranchus sp. 6 at Jun Imamoto's website http://www.umiushi.info, it seems to be highly variable and is possibly a variant of IPN Eubranchus sp. 11 at page 357.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2016), published 8 October 2016, Eubranchus sp. 16 Genus: Forbes, 1838
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Eubranchus_sp_16.htm