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This species is part of the 'Flabellina rubrolineata look-alike' complex:
Pretty similar are
Flabellina rubrolineata, which differs by papillate whitish rhinophores with purplish tips,
Flabellina delicata, which lacks the purple longitudinal lines.
Dr. Richard C. Willan writes on the above specimen:"This one is a real puzzle for me. It is definitely not Flabellina delicata. It seems closest to
Flabellina rubrolineata, but I never saw a colour form of F. rubrolineata like this one. It might be an undescribed Flabellina species."
This species was posted on 7 May 2015 at these websites as Flabellina sp. 06 Genus: Voigt, 1834,
Burn (2018) established that the name Flabellina was first established by McMurtrie in the first English edition of Cuvier's Règne Animal. The name Flabellina had earlier been attributed by ICZN Opinion 781 to Voigt (1834), in the German edition of Cuvier's work; and later to Gray (1833) in
Griffith & Pidgeon's translation of the same work.
I changed it on 7 April 2018 into Flabellina sp. 06 Genus: McMurtrie, 1831
Robert Burn 2018. Flabellina McMurtrie, 1831: The earliest valid Latinization?
THE NAUTILUS 132(1):33 - 34, 2018
How to cite:
Köhler, E. (2018), published 7 April 2018, Flabellina sp. 06 Genus: McMurtrie, 1831
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Flabellina_sp_06.htm