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It looks at first glance like a flatworm, because of the very thin mantle!
I am not sure on the generic placement, that is why I use the family and call it Discodorididae sp. 11.
This species is most likely as Discodorid sp. 3 in IPN at page 176.
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. (2017), published 22 March 2017, Discodorididae sp. 12 Family: Bergh, 1891
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Discodorididae_sp_12.htm