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It might be a variant of the Japanese species Thordisa sanguinea Baba, 1955 which lacks the white pigment on the tips of the median papillae, or an undespibed species of the genus Thordisa Bergh, 1877, or some other genera...
Dr. Alicia Hermosillo-González labeled this picture "Dorido amarillo 4.JPG".
I am not sure which genus it might be, that is why I keep it for now as Discodorididae sp. 18 Family: Bergh, 1891
How to cite:
Köhler, E. (2017), published 23 March 2017, Discodorididae sp. 18 Family: Bergh, 1891
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Discodorididae_sp_18.htm