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Thorunna cf. australis (Risbec, 1928) [Chromodoris]

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cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Thorunna australis or perhaps something closely related, or at least similar in appearance.
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.
Thorunna cf. australis differs by 3 orange rings on the rhinophore clubs and by ornaments between the two longitudinal white lines, that is one white median line and some blue spots..
There is a picture of most likely the same species, though the rhinophores differ slightly, also from Anilao, Luzon Island at Jim Anderson's http://www.nudibranch.org as Thorunna australis.
Pretty similar are:
Hypselodoris maculosa which has multiple longitudinal white lines and two 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.
More information on Thorunna australis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 5 October 2018, Thorunna cf. australis (Risbec, 1928)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Thorunna_australis_cf.htm

 
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