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Noumea alboannulata  Rudman, 1986

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Noumea alboannulata is characterised by a translucent pink mantle with a broad cream or white marginal band. There is a very distinctive opaque white band in the midline between the rhinophores which splits just behind the rhinophores to form an elongate oval which encircles the gill pocket.
Pretty similar are:
Durvilledoris pusilla, whose white band does not split behind the rhinophores,
Durvilledoris similaris which has an translucent pinkish purple mantle and a median white line which forms a ring around the gill pocket. The upper half of the rhinophores and gills is translucent red/orange, the lower half is pale, and
Noumea norba whose white band always encircle the gill pocket and can be broken in two about half way along its length.
More informations on Noumea alboannulata are at Bill Rudman's Sea-Slug Forum!