Marcus & Marcus, 1970
Widespread in tropical Indo-West Pacific
Split Solitary Is, Coffs Harbour, northern New South Wales, December 1990. Lower photo showing two animals on sponge with eggs, 70ft (approx 24m), PHOTOS: C. Buchanan.
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. Noumea norba and Noumea varians are quite similar in colour however their internal anatomy is quite different. One way of distinguishing living animals is that N. norba is quite like a species of Chromodoris in shape with a relatively wide flattened body and broad mantle skirt while N. varians is more like a Hypselodoris with a relatively high body and narrow mantle skirt.
In an earlier revision (Rudman, 1986) I considered this species to be a synonym of Noumea purpurea but now that we no more about the anatomy and colour variation in that species, they are clearly distinct.
See the Noumea purpurea Colour Group Page to compare this species with others of similar colour.
•Rudman, W.B. (1986) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Noumea purpurea and Chromodoris decora colour groups. Zoological Journal of the Linnean Society 86(4): 309-353.
Rudman, W.B., 1999 (December 5) Noumea norba Marcus & Marcus, 1970. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/noumnorb
Noumea norba from Indonesia?
From: Bill Van Antwerp, November 14, 2005
Noumea norba from South Africa
From: Colin Ogden, July 6, 2005
Noumea norba and Hypselodoris bullocki
From: Bruce Potter, April 20, 2005
Noumea norba from Reunion Island
From: Philibert Bidgrain, February 12, 2005
Noumea norba from the Philippines
From: Erwin Koehler, December 14, 2002
Noumea alboannulata? from the Red Sea
From: Dr Jacob Dafni, April 10, 2002
Nudibranch from Bremer Bay, Western Australia
From: Craig Lebens, December 8, 2001
Re: Noumea norba from Hachijo Is, Japan
From: Nishina Masayoshi, August 14, 2001
Noumea norba from Hachijo Is, Japan
From: Nishina Masayoshi, August 12, 2001
Tonga Records: Noumea norba
From: Don Barclay, May 29, 2001
Noumea norba from Solomon Ids
From: Bruce Potter, January 8, 2001
Noumea norba? from Hawaii
From: Anne Dupont, December 21, 1999