Selection: Noumea norba

Noumea norba Marcus & Marcus, 1970

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In Noumea norba the background colour of the mantle can vary from reddish purple to pinkish orange in different specimens. There is a broad milky yellow or creamy white band around the mantle edge and on the inside edge of this band are a series of reddish purple streaks or smudged marks. In the midline there is a broad band of irregular width of the same colour as the mantle border. This band always encircle the gill pocket and can be broken in two about half way along its length. The gills and rhinophores are tinged with orange-red.
Pretty similar are:
Durvilledoris 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,
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 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.
More informations on Noumea norba are at Bill Rudman's Sea-Slug Forum!