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There is orange pigment on the tips of the siphon and on the tips flagellum. There is a series of tubercles over the surface of the body.
There are more pictures of Sagaminopteron bilealbum from the type localty Guam at the website http://guamreeflife.com/, and from the Marshall Islands.
Carlson, C.H. & Hoff, P.J. (1973). Two new species of Gastropteridae from Guam, Marianas Islands (Opisthobranchia: Cephalaspidea).
Publications of the Seto Marine Biological Laboratory, 21(2): 141-151.
online (scroll down): https://core.ac.uk/download/pdf/39301779.pdf
How to cite:
Köhler, E. (2017), published 23 December 2017, Sagaminopteron bilealbum Carlson & Hoff, 1973
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Sagaminopteron_bilealbum.htm