Click the thumbnail photos to enhance!
Pretty similar is Okenia sp. 01 Genus: Menke, 1830, which lacks the median londitudinal orange ridge.
More information on Goniodoridella savignyi are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 16 November 2017, Goniodoridella savignyi Pruvot-Fol, 1933
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Goniodoridella_savignyi.htm