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Coryphellina rubrolineata  O'Donoghue, 1929

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There are many colour variations within Coryphellina rubrolineata. It usually has red longitudinal lines on its body, one down the centre of its back and one down each side of the body just below the cerata, but these lines can sometimes be broken, or be totally absent. The rhinophores are papillate, often with a reddish apex.
I have posted more pictures of Coryphellina rubrolineata than usual, to show some of its colour variations.
It is part of the 'Coryphellina rubrolineata look-alike' complex:
Pretty similar are:
Flabellina cf. rubrolineata which has smooth rhinophores, and
Unidentia sandramillenae which has a broad opaque white band at the smooth rhinophores,and
Flabellina sp. 05 which differs by smooth rhinophores, which are basally bluish with a white outer half, the oral tentacles are of the same colour.
Unidentia cf. angelvaldesi which lacks the purple longitudinal lines.
This species was posted on 9 June 2003 at these websites as Flabellina rubrolineata (O’Donoghue, 1929) [Coryphellina],
Korshunova et al. (2017) reinstated the genus Coryphellina O'Donoghue, 1929 within the family
Flabellinidae  Bergh, 1889,
and moved Flabellina rubrolineata (O’Donoghue, 1929) [Coryphellina] into the genus Coryphellina O'Donoghue, 1929.
I changed it on 12 December 2017 into Coryphellina rubrolineata  O'Donoghue, 1929.
Reference:
Korshunova, T.; Martynov, A.; Bakken, T.; Evertsen, J.; Fletcher, K.; Mudianta, W.; Saito, H.; Lundin, K.; Schrödl, M.; Picton, B. (2017). Polyphyly of the traditional family Flabellinidae affects a major group of Nudibranchia: aeolidacean taxonomic reassessment with descriptions of several new families, genera, and species (Mollusca, Gastropoda).
ZooKeys. 717: 1-139., available online at https://doi.org/10.3897/zookeys.717.21885
More information on Coryphellina exoptata as Flabellina exoptata are on
More information on Coryphellina rubrolineata as Flabellina rubrolineata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 12 December 2017, Coryphellina rubrolineata  O'Donoghue, 1929
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Coryphellina_rubrolineata.htm