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Sagaminopteron sp. 04 is is characterized by a whitish colour, orange borders at the parapodia, and by an orange line on the siphon.
There are some better pictures of this species from the Marshall Islands online.
Somehow similar is Siphopteron quadrispinosum which differs by a red siphon and by a red flagellum.
How to cite:
Köhler, E. (2016), published 10 July 2016, Sagaminopteron sp. 04 Genus: Tokioka & Baba, 1964
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Sagaminopteron_sp_04.htm