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There are many similar coloured chromodorids which Bill Rudman calls the "Noumea purpurea colour group".
Pretty similar are:
Mexichromis pusilla, whose white band does not split behind the rhinophores,
Mexichromis 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,
Verconia varians, which has no white patch or band around the gill pocket, and differs by the white midline, which varies from a broad white band to a series of up to three thin elongate white streaks, and
Verconia norba whose white band always encircle the gill pocket and can be broken in two about half way along its length.
This species was posted on 7 July 2003 on these websites as Noumea alboannulata Rudman, 1986.
The discovery by Rüdiger Bieler that the generic name Noumea was first introduced by Fauvel (1874) for a beetle means that the subsequent introduction by Risbec (1928) for a nudibranch is invalid. Therefore the next available generic name has to be used for the genus of nudibranchs, and that
is Verconia Pruvot-Fol, 1931.
Bieler, R.; Bouchet, P.; Caballer, M. (2015). Verconia Pruvot-Fol, 1931. In: MolluscaBase (2015). Accessed through:
World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533937 on 2016-02-02.
More information on Verconia alboannulata as Noumea alboannulata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 2 February 2016, Verconia alboannulata (Rudman, 1986)
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Verconia_alboannulata.htm