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There are many similar coloured chromodorids which Bill Rudman calls the "Noumea purpurea colour group".
Pretty similar are:
Mexichromis pusilla which has an pale pink mantle with an elongate white streak in the midline between the rhinophores and another in front of the gills, but not around the gill pocket,
Verconia varians, which has no white patch or band around the gill pocket,
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 and
Verconia alboannulata which has an opaque white band in the midline which splits just behind the rhinophores to form an elongate oval which encircles the gill pocket.
This species was posted on 7 July 2003 on these websites as Noumea norba Er. & Ev. Marcus, 1970.
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 norbaas Noumea norba are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 2 February 2016, Verconia norba (Er. & Ev. Marcus, 1970)
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Verconia_norba.htm