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Pretty similar are:
Platydoris formosa which differs by its bright red rhinophores and by distinct black lines outlining the gills,
Platydoris cruenta which differs by its hair-like brown lines on the mantle, and
Platydoris scabra which lacks red patches on the mantle.
This species was posted on 2 June 2004 at these websites as Platydoris cf. formosa (Alder & Hancock, 1866) [Doris], I identified and changed it
on 23 May 2011 into Platydoris cinerobranchiata Dorgan, Valdés & Gosliner, 2002.
More information on Platydoris cinerobranchiata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 9 September 2017, Platydoris cinerobranchiata Dorgan, Valdés & Gosliner, 2002
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Platydoris_cinerobranchiata.htm