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/find/noumangu
April 21, 2008
From: Mike Krampf
I was wondering if you could help identify this one for me?
Locality: Puerto Galera, 20 ft, Mindoro Island, Phillipines, Batangas Sea, 3 August 2007, Sand and coral rubble. Length: 15 mm. Photographer: Mike Krampf.
email@example.comKrampf, Mike, 2008 (Apr 21) Glossodoris symmetricus ? from the Philippines. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20854
One thing I am not sure of is whether the apparent a red border to the mantle is real or an artifact of the scanning or photographic process. Initially I thought it was real when when I was resizing the files I began to have some doubts.
This reminds me of the lower photo in Philibert Bidgrain's message [#12984] of an animal I identified as Glossodoris symmetricus. It has the same white line on the rhinophores. I assume its a juvenile form, but there is always a possibility it is something different, perhaps a species of Noumea. One possibility is Noumea angustolutea, but in this colour group I feel the only way to be sure is to look at the anatomy.
September 26, 2002
From: Don Barclay
Here are a few shots of a pair of small nudibranchs found by Larry Madrigal on the afternoon of 11 July 2001. They were collected in shallow water under a large slab on the reef flat, Aua village, American Samoa. They measured about 12 and 16mm.
This appears to be one of your "rhthmic gill wagglers," or at least the entire time I was trying to photograph it, it would vibrate or waggle it's gills about once per second.
Could you confirm that they are Noumea angustolutea? If so, it looks like a possible known range extension to the east.
Thanks as always,
Don (and Larry)
Barclay, D., 2002 (Sep 26) Noumea angustolutea? from American Samoa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4819
Dear Don & Larry,
I am pretty sure this is Noumea angustolutea but I would feel more comfortable if I had some 'inside' information.
October 17, 1999
From: Erwin Koehler
Can you help me identify these please - they are still unposted to my web-site because I can't identify them.
Locality: Philippines, Cebu Is., Moalboal, divesite "Tongo Point", size 15 mm, depth unrecorded (max 18 m), nightdive, March 03, 1999.
Medslugs.Koehler@t-online.deKoehler, E., 1999 (Oct 17) Noumea angustolutea? from Philippines. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1430
I'm pretty sure they are Noumea angustolutea. I obviously can't see the yellow line at the mantle edge in your photos, but in all other features they match.