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Thanks for identification to Terrence M. Gosliner, USA
All of these species have rounded orange spots of various sizes and are very similar:
Haminoea sp. 01 which differs by its greenish-yellow, black and purple spots, none of them is surrounded by opaque white
Haminoea sp. 02 which lacks purple spots,
Haminoea cymbalum which has no black spots or markings, and differs by broad orange bands and spots surrounded by opaque white
More information on Haminoea ovalis are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 24 June 2016, Haminoea ovalis Pease, 1868
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Haminoea_ovalis.htm