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To my knowledge is this the only picture of this species, it is not in IPN nor at the internet! This might be a strange colour form of Favorinus sp. 02,which differs by blueish tips of the cerata and some specimens by minute white spots on the cerata.
How to cite:
Köhler, E. (2016), published 25 September 2016, Favorinus sp. 04 Genus: M.E. Gray, 1850
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Favorinus_sp_04.htm