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It feeds on the eggs of other sea-slugs like all members of the genus Favorinus. The colour of the cerata depends on the colour of the eggs it has been feeding on.
More information on Favorinus mirabilis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 23 October 2016, Favorinus mirabilis Baba, 1955
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Favorinus_mirabilis.htm