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Siphopteron sp. 04 is characterized by a clear to translucent whitish/yellowish colour, and brown/black lines.
This species might be a colour form of Siphopteron sp. 11 in Gosliner et al. (2015) page 61.
It was because of the Sea-Slug Forum misidentified and posted on 8 January 2015 at these websites as Siphopteron quadrispinosum Gosliner, 1989.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch &Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
How to cite:
Köhler, E. (2016), published 10 June 2017, Siphopteron sp. 04 Genus: Gosliner, 1989
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Siphopteron_sp_04.htm