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It is similar in shape to the smaller Samla bicolor, 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 bilas.
In IPN is at page 352 a picture of a specimen which lacks the left oral tentacle, and the right oral tentacle does not show the distinctive purple bands, which are also not mentioned in the text.
This picture shows 4 specimens ranging in size from 5 to 7 cm length.
This species was posted on 13 July 2011 at these websites as Flabellina riwo 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 riwo Gosliner & Willan, 1991 into the genus Samla Bergh, 1900.
I changed it on 10 December 2017 into Samla riwo (Gosliner & Willan, 1991) [Flabellina].
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
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 riwo are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2019), published 1 December 2019, Samla riwo (Gosliner & Willan, 1991)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Samla_riwo.htm