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It is part of the 'Flabellina rubrolineata look-alike' complex:
Pretty similar are
Unidentia angelvaldesi, which differs by the broad white band on the translucent orange rhinophores, and by the translucent orange background colour,
Flabellina rubrolineata, which differs by papillate whitish rhinophores with purplish tips,
Flabellina cf. rubrolineata, which differs by the translucent bluish rhinophores and oral tentacles.
Unidentia cf. angelvaldesi which lacks the purple longitudinal lines.
There were many pictures of the 'Flabellina rubrolineata look-alike' complex as Flabellina sp. from various locations at Nudi Pixel!
The website NUDIPIXEL is down, that is the pictures are gone.
This species was posted on 8 September 2012 at these websites as Flabellina sp. 05 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. 05 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. 05 Genus: McMurtrie, 1831
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Flabellina_sp_05.htm