Probably Indo-West Pacific. (known from Great Barrier Reef, Queensland; Philippines; Thailand, Marshall Ids).
UPPER: Enewetak Atoll, Marshall Ids, april 1983, 23mm long. PHOTO: Scott Johnson.
LOWER: PhiPhi Lae Is, 48km S.E of Phuket, Sthn Thailand, December 1989. PHOTO: David Brunckhorst.
Mantle translucent clear with a diffuse opaque white medial band down the mantle. At the mantle edge there is a diffuse creamy yellow submarginal band and a white marginal border. Along the edge is a thin golden yellow line (see inset on top photo). The gills and rhinophore clubs are edged with reddish brown. There is a wide line up the posterior midline of the rhinophores. The gills have a fast flickering movement when the animal is crawling. There are about 20 chromodorids with a white mantle and gold or yellow border which I have discussed previously as the Chromodoris aureomarginata colour-group. These colour groups are just a convenient way of comparing similarly coloured species and have no phylogenetic significance.
• Rudman, W.B. (1990) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: further species of Glossodoris, Thorunna and the Chromodoris aureomarginata colour group. Zoological Journal of the Linnean Society, 100(3): 263-326.
Rudman, W.B., 1999 (October 17) Noumea angustolutea Rudman, 1990. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/noumangu