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This species is most probably Goniodoris sp. 4 in IPN:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp. on page 125
There are some pictures of similar Goniodoris species online, from Komodo, Indonesia and from the Marshall Islands.
How to cite:
Köhler, E. (2016), published 15 January 2016, Goniodoris sp. 02 Genus: Forbes & Goodsir, 1839
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Goniodoris_sp_02.htm