Click the thumbnail photos to enhance!
Pretty similar are:
Platydoris cinerobranchiata which differs by uniformly bluish-grey gills and by brownish-green rhinophores and
Platydoris cruenta which differs by its hair-like brown lines on the mantle.
Platydoris scabra which lacks red patches on the mantle and differs by brownish rhinophores.
More information on Platydoris formosa are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 30 January 2018, Platydoris formosa (Alder & Hancock, 1866)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Platydoris_formosa.htm