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I call it Chelidonura sp. 02 to distinguish it from other species of Chelidonura. It is completely black (no spots, dots, ornaments, nor lines), and characterized by a broad opaque white band across the head-shield.
Very similar are
Chelidonura sp. 01 which lacks the broad opaque white band across the head-shield
Chelidonura sp. 03 which differs by a translucent whitish band across the head-shield, and is densely covered with irregular white spots, and has also a few yellowish-orange spots on the black body,
Chelidonura alexisi which lacks the broad opaque white band across the head-shield, and is densely covered with minute white spots.
Chelidonura sp. 02 is possibly a colour variant of Chelidonura sandrana or of Chelidonura tsurugensis.
I received on 02 August 2012 an email telling that a PhD student from Mexico (Andrea Zamora) and Manuel Malaquias are working in Bergen on a worldwide revision of the genus Chelidonura, hopefully some of the problems (colour variant or not) will be solved.
This species was posted on 5 January 2004 at these websites as Chelidonura sp. B Genus: A. Adams, 1850, on 27 July 2011 changed into
Chelidonura sp. 02 Genus: A. Adams, 1850.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
More information on Chelidonura sp. 02 as Chelidonura sp. 1 are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 24 June 2016, Chelidonura sp. 02 Genus: A. Adams, 1850
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Chelidonura_sp_02.htm