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Flabellina cf. rubrolineata (O’Donoghue, 1929) [Coryphellina]

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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 Flabellina rubrolineata or perhaps something closely related, or at least similar in appearance.
Flabellina cf. rubrolineata has reddish-violet longitudinal lines on its body, one down the centre of its back and one down each side of the body just below the cerata. The smooth rhinophores are translucent pink at the base merging into translucent violet, with a translucent whitish apex. The oral tentacles are of the same colour. The cerata are whitish-pink with a reddish-violet subapical ring.
It is part of the 'Flabellina rubrolineata look-alike' complex:
Pretty similar are :
Flabellina rubrolineata which differs by the papillae at the posterior side of the rhinophores, and
Unidentia angelvaldesi which has a broad opaque white band at the rhinophores, and a translucent orange background colour.
Flabellina sp. 05 which differs by the bluish rhinophores and oral tentacles both with a white outer half.
Unidentia cf. angelvaldesi which lacks the purple longitudinal lines.
More information on Flabellina rubrolineata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 7 November 2016, Flabellina cf. rubrolineata (O’Donoghue, 1929)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Flabellina_rubrolineata_cf.htm