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Siphopteron quadrispinosum  Gosliner, 1989

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Siphopteron quadrispinosum is highly variable in colour - the description of it in
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 53,
is, let me quote: " The yellow body color with red siphon and flagellum are characteristic of this species."
This species was posted on 16 December 2003 at these website as Siphopteron sp. B with the description: "It is characterized by a pale pink/whitish colour, red borders at the parapodia, along the margin of the posterior shield, and by the bright red siphon and flagellum."
I changed it on 14 October 2010 into Siphopteron quadrispinosum  Gosliner, 1989.
The recent picture of Gordon Tillen shows a colour form which was identified before as Siphopteron sp. 3 on the Sea Slug Forum, but is now considered to be a variant of Siphopteron quadrispinosum. Some of the shots show a specimen laying eggs.
Pretty similar is Sagaminopteron sp. 03 which differs by the brown bordered yellow spot around the flagellum.
More information on Siphopteron quadrispinosum and many more colour variantons are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 13 July 2016, Siphopteron quadrispinosum  Gosliner, 1989
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Siphopteron_quadrispinosum.htm