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It is similar in shape to Flabellina riwo, including the long oral tentacles with flattened tips. It differs by the colour pattern.
One more species with that kind of oral tentacles is Samla bicolor.
This species was posted on 7 June 2003 at these websites as Flabellina bilas Gosliner & Willan, 1991,
Korshunova et al. (2017) reinstated the genus Samla Bergh, 1900 within the new family
Samlidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017,
and moved Flabellina bilas Gosliner & Willan, 1991 into the genus Samla Bergh, 1900.
I changed it on 6 December 2017 into Samla bilas (Gosliner & Willan, 1991) [Flabellina].
Korshunova, T.; Martynov, A.; Bakken, T.; Evertsen, J.; Fletcher, K.; Mudianta, W.; Saito, H.; Lundin, K.; Schrödl, M.; Picton, B. (2017). Polyphyly of the traditional family Flabellinidae affects a major group of Nudibranchia: aeolidacean taxonomic reassessment with descriptions of several new families, genera, and species (Mollusca, Gastropoda).
ZooKeys. 717: 1-139., available online at https://doi.org/10.3897/zookeys.717.21885
More information on Samla bicolor as Flabellina bicolor are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 6 December 2017, Samla bilas (Gosliner & Willan, 1991)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Samla_bilas.htm