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Pretty similar are:
Platydoris cinerobranchiata which differs by uniformly bluish-grey gills and by brownish-green rhinophores and lacks the brown lines and
Platydoris formosa which differs by its bright red rhinophores and by distinct black lines outlining the gills and lacks the brown lines.
More information on Platydoris cruenta are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 13 April 2017, Platydoris cruenta (Quoy & Gaimard, 1832)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Platydoris_cruenta.htm