Hypselodoris sagamiensis (Baba, 1949) [Glossodoris]
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Hypselodoris sagamiensis is characterized by a translucent mantle, sometimes with
much of the mantle covered with opaque white. In other cases there is little opaque white
pigmentation on the mantle except for low raised pustules in the central region, and a broad
irregularly shaped band around the margin. There are smaller blue spots scattered over the
mantle and some larger diffuse black patches forming a band around the mantle just at the
outer edge of the visceral mass. At the edge of the mantle is a band of purple, usually entire
around the anterior end but breaking into a series of patches along the sides. Inside the purple
margin is a broken band of ornage-yellow. The rhinophore stalk is white and the club red.
The simple gills are translucent white with orange-red edging.
There are pictures of very similar specimens from Japan on the Sea-Slug Forum,
I am confident that my ID is correct
More information on Hypselodoris sagamiensis are on
Bill Rudman's Sea-Slug Forum!