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It looks somehow similar to
Cratena lineata, which has orange/red patches on the head and differs by white lines on the notum,
Cratena cf. lineata A, which has two orange/red patches in front of the rhinophores and to
Cratena cf. lineata B, which has opaque white lines on the notum.
This species is Cratena sp. 3 in IPN at page 396:
This specimen was originally posted at these websites as Cratena cf. lineata A, I realized the misidentification on 15 July 2011, when Gordon Tillen sent a picture of another specimen.
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 24 January 2016, Cratena sp. 01 Genus: Bergh, 1864
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Cratena_sp_01.htm