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Thorunna australis (Risbec, 1928) [Chromodoris]

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Thorunna australis is characterized by the pale bluish or pink background colour, two longitudinal white lines, one on either side of the mantle and always one reddish band on the rhinophores.
Pretty similar are:
Hypselodoris maculosa which has multiple longitudinal white lines and up to three reddish bands on the white rhinophores,
Thorunna cf. florens which differs by 2 broad dark pink longitudinal bands, outlined in opaque white, by orange rhinophores with a white spot, and by a transverse orange patch on the front of the mantle,
Mexichromis aurora which differs by 3 wide whitish yellow longitudinal bands each outlined with opaque white, and by purple or blue spots between the bands and near the margin, and by small opaque white submarginal spots.
Hypselodoris yarae which differs by a broad orange marginal band, and by three orange/red rhinophoral rings on the rhinophore clubs,
Hypselodoris paradisa which differs by three orange/red rhinophoral rings on the rhinophore clubs, and by many longitudinal white lines, and has a V-Shaped reddish mark posterior to the rhinophores.
More information on Thorunna australis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2021), published 22 January 2021, Thorunna australis (Risbec, 1928)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Thorunna_australis.htm

 
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