Previously known only from New Caledonia and Christmas Island, Indian Ocean. New locality records in Forum from Philippines, Marshall Ids and Japan.
Christmas Island, Indian Ocean, April 1981, 15mm long alive, PHOTO: J.Hicks.
This species has some similarities to some colour forms of Hypselodoris maculosa but whereas that species has multiple longitudinal white lines Thorunna australis has only one on either side of the mantle. Both species have reddish bands on the rhinophores, always one in T. australis but up to three in H. maculosa.
• 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., 1998 (November 11) Thorunna australis (Risbec, 1928). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/thoraust
Thorunna australis on possible food, Mayotte Island
From: Matthias Deuss, March 11, 2010
Thorunna australis from Lembeh
From: Sylvain Le Bris, May 21, 2009
Thorunna australis from South Africa
From: Colin Ogden, October 10, 2005
Thorunna australis from Christmas Island
From: W.B. Rudman, May 9, 2002
Re: Thorunna australis from Tokyo
From: Hitoshi Ono , September 11, 2000
Thorunna australis? from Japan
From: Hitoshi Ono, September 7, 2000
Thorunna australis? from Philippines
From: Erwin Koehler, June 19, 2000
Thorunna australis in the Marshall Is.
From: Scott Johnson, August 18, 1999