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This species is Noalda sp. 2 in IPN, page 37, and most possibly also Noalda sp. 2 at the Sea Slug Forum, which differs by yellow pigment on the head.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.,
More information on Noalda sp. 02 as Noalda sp. 2 are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 24 June 2016, Noalda sp. 02 Genus: Iredale, 1936
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Noalda_sp_02.htm