Glossodoris angasi
Rudman, 1986
Order: NUDIBRANCHIA
Suborder: DORIDINA
Family: Chromodorididae
DISTRIBUTION
Known only from intertidal and sublittoral waters of New South Wales.
PHOTO
Showing range in colour of mantle border.
•C132936 - Minnie Waters, nthn New South Wales, intertidal, March 1982, 35, 42mm long, Paratypes.
Photos: Bill Rudman.
Sinilar in colour to Glossodoris atromarginata it differs in having a much softer body and wider mantle skirt. The mantle glands are easily seen as an irregular opaque white band near the mantle edge. The mantle is bordered by a thin line which varies in colour from black and dark brown to a pale pinkish brown. The rhinophore stalj is translucent white and the club is black with a thin whitish line up the anterior midline. The simple gills are translucent white with a black dusting along the edges, especially in the upper half to one-third. In some animals the whole upper third of each gill is dusted with black. The gills move rhythmically. It grows up to 45mm long.
Reference:
• Rudman, W.B. (1986) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: the genus Glossodoris Ehrenberg (=Casella, H.& A. Adams). Zoological Journal of the Linnean Society, 86: 101-184.
Rudman, W.B., 2001 (August 22) Glossodoris angasi Rudman, 1986. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/glosang
Related messages
Is this Glossodoris angasi from Bare Island, La Perouse, NSW
March 5, 2007
From: Andrew Trevor-Jones
G'day Bill,
Is this one Glossodoris angasi?
Locality: Bare Island, La Perouse, 10.6 m, NSW, Australia, Pacific Ocean, 3 December 2006, Rocky reef with algae and sponges. Length: ~40 mm. Photographer: Andrew Trevor-Jones.
Andrew Trevor-Jones
atj777@attglobal.net
Trevor-Jones, A.G., 2007 (Mar 5) Is this Glossodoris angasi from Bare Island, La Perouse, NSW. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19555Dear Andrew,
Yes this is G. angasi. It differs from G. atromarginata, which you found at the same time [message #19554] in a number of anatomical characters, and fortunately one very obvious external chracter which can be seen clearly in your photo. In G. atromarginata, there are a few ovate or spherical mantle glands embedded in the mantle tissue some distance in from the mantle edge, while in G. angasi the mantle glands form a crowded, ramifying network right at the mantle edge.
Another external difference is that the mantle edge in G. angasi is usually a shade of brown, [pinkish brown to dark brown] while in G. atromarginata, as its name suggests, the mantle edge is black.
Best wishes,
Bill Rudman
Glossodoris angasi from Port Stephens, NSW
February 18, 2006
From: Bruce Potter
Dear Bill,
I was diving at Fly Point, Nelson Bay, yesterday when I saw what I thought was an G. atromarginata until I looked more closely and realised it was in fact different. I subsequently decided it was Glossodoris angasi
Locality: Fly Point, Nelson Bay, Port Stephens, NSW, Australia. 12 metres, 12 February 2006, rocky sandy weeds and algae. Length: 30 mm.
Photographer: Bruce Potter
Regards
Bruce Potter
bandppotter@bigpond.com
Potter, B., 2006 (Feb 18) Glossodoris angasi from Port Stephens, NSW. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15841Thanks Bruce,
Well done. They can be quite tricky
Best wishes,
Bill Rudman
Glossodoris angasi from Sydney, Australia
November 19, 2002
From: Allan Saben
Bill,
Here is a photo of Glossodoris angasi. It was taken at The Gap, South Head, Sydney, NSW, 16 meters.
Enjoy,
Allan
asaben@bigpond.net.au
Saben, A., 2002 (Nov 19) Glossodoris angasi from Sydney, Australia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8433Thanks Allan,
Bill Rudman
Glossodoris at Fly Point
January 7, 1998
From: David & Leanne Atkinson
Bill,
We found these at Fly Point, Port Stephens, New South Wales over Christmas. The first is a nudi that looks like a Glossodoris atromarginata but has a red frill where the other has black. Gills and rhinophores are black in both cases. Is this a colour variation?
Thanks,
David & Leanne Atkinson.
atkin@hunterlink.net.au
Atkinson, D. & L., 1998 (Jan 7) Glossodoris at Fly Point. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/62This is Glossodoris angasi which does indeed look like Glossodoris atromarginata and has been mistaken for it since 1864 when George Angas published his account on nudibranchs from Sydney Harbour. I named this species after Angas. The internal anatomy of these species is quite different but externally their colour is very similar. Glossodoris angasi has a much softer body than G. atromarginata, the edge of the mantle is less folded, and the colour band ranges from reddish brown to a light pink. In G. atromarginata the colour border is black...Bill Rudman
Rudman, W.B., 1998 (Jan 7). Comment on Glossodoris at Fly Point by David & Leanne Atkinson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/62