Thorunna australis
(Risbec, 1928)

Suborder: DORIDINA
Family: Chromodorididae


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.


Hypselodoris maculosa

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.

Authorship details
Rudman, W.B., 1998 (November 11) Thorunna australis (Risbec, 1928). [In] Sea Slug Forum. Australian Museum, Sydney. Available from

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