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Pretty similar is Hypselodoris iacula which differs by its network of opaque white lines, by its pinkish-white body, and by the scalloped orange mantle margin.
More information on Hypselodoris purpureomaculosa are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 20 August 2017, Hypselodoris purpureomaculosa Hamatani, 1995
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Hypselodoris_purpureomaculosa.htm