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It is characterized by its whitish-tan background colour with a bluish tinge, and by brown spots forming transverse bands. The velar tentacles are long and branched. The secondary gills are solid brownish with brown spots at the whitish-tan bases.
Pretty similar or possibly the same species is:
Marionia sp. 07 Genus: Vayssière, 1877, which differs by brown spots on the sides of the body, by pale tan gills with brown spots, and by broad brown transverse bands.
How to cite:
Köhler, E. (2016), published 20 September 2016, Marionia sp. 18 Genus: Vayssière, 1877
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Marionia_sp_18.htm