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Siphopteron makisig  Ong & Gosliner, 2017

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Siphopteron makisig was considered by Bill Rudman be a variant of Siphopteron quadrispinosum, which is most likely endemic to Hawaii,
let me quote IPN page 53: " The yellow body color with red siphon and flagellum are characteristic of this species."
Ong & Gosliner (2017) described the above species and removed Siphopteron leah  Klussmann-Kolb & Klussmann, 2003 from synonymy with Siphopteron quadrispinosum  Gosliner, 1989.
Let ne quote Ong & Gosliner (2017): "External morphology: Living animal 4 mm in length (Fig. 14C). Parapodia, head shield and foot translucent white to faint vermillion red. Head shield roughly triangular, tapering posteriorly to siphon. Medial yellow line present on the anterior part of head shield. Additional red orange line found along lateral margins of head shield and extending to tip of siphon with medial white ridge along its posterior edge, extending to red orange apex. Apex higher than lateral margins (Fig. 18A). Parapodia lined with yellow and orange marginal accents. Visceral hump more opaque white than head shield or parapodia with bright red orange ring around posterior end of visceral hump. Flagellum translucent white with bright orange-red tip. Foot translucent white with central yellow stripe down in the middle. Flagellum found on the right side of visceral hump. Gill with four simple folds."
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 because of the Sea-Slug Forum 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 was then considered to be a variant of Siphopteron quadrispinosum. Some of the shots show a specimen laying eggs.
Pretty similar is Siphopteron sp. 03 which differs by the brown bordered yellow spot around the flagellum.
References:
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
Ong E., Hallas J.M. & Gosliner T.M. (2017). Like a bat out of heaven: the phylogeny and diversity of the bat-winged slugs (Heterobranchia: Gastropteridae).
Zoological Journal of the Linnean Society. DOI: 10.1093/zoolinnean/zlw018., available online at https://doi.org/10.1093/zoolinnean/zlw018
More information on Siphopteron makisig as Siphopteron quadrispinosum and many more colour variatons are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 10 June 2017, Siphopteron makisig  Ong & Gosliner, 2017
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Siphopteron_makisig.htm