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It is similar in shape to larger Flabellina riwo, including the long oral tentacles with flattened tips. It differs by the colour pattern of the cerata, oral tentacles and the body.
One more species with that kind of oral tentacles is Flabellina bilas.
Pretty similar is Flabellina cf. bicolor, which differs by the long cerata, and by the lack of the flattened tips of the oral tentacles.
More information on Flabellina bicolor are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 26 October 2016, Flabellina bicolor (Kelaart, 1858)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Flabellina_bicolor.htm