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IPN writes: Size: Length 30 mm, in Philippine Marine Mollusks is a picture of a 80 mm specimen from Anilao
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp. at page 352
Poppe, G.T. (2010). Philippine marine mollusks: III. (Gastropoda Part 3 & Bivalvia Part 1). ConchBooks: Hackenheim. ISBN 978-3-939767-18-3. 665 pp Pretty similar is Flabellina bicolor which is a smaller species and differs by an orange subapical ring on the cerata and by the long oral tentacles with flattened, paddle-shaped tips.
How to cite:
Köhler, E. (2017), published 31 March 2017, Flabellina macassarana Bergh, 1905
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Flabellina_macassarana.htm