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Pretty similar are:
Discodorididae sp. 13 which differs by middorsal knobs,
Discodorididae sp. 07 which lacks the marginal orange pigment, and has a flatter median ridge
I am not sure which genus it might be, though I lean to Atagema Bergh, 1877, that is the reason why I use the family and keep it for now as
Discodorididae sp. 27 Family: Bergh, 1891.
How to cite:
Köhler, E. (2017), published 24 March 2017, Discodorididae sp. 27 Family: Bergh, 1891
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Discodorididae_sp_27.htm