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I label it Pseudocerotidae sp. 20, because my best guess is that it should be placed in the family Pseudocerotidae Lang, 1884.
It is characterized by its orange/red background colour with a network of white lines, and by a broad marginal band of alternating blue and black patches.
How to cite:
Köhler, E. (2017), published 15 April 2017, Pseudocerotidae sp. 20 Family: Lang, 1884
available from https://www.Philippine-Sea-Slugs.com/Look-alike/Platyhelminthes/Pseudocerotidae_sp_20/Select.htm