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It is Facelina sp. 2 in IPN on page 374.
This species was posted on 21 September 2010 at these websites as Facelina sp. A Genus: Alder & Hancock, 1855, on 12 August 2011 changed into
Facelina sp. 01 Genus: Alder & Hancock, 1855.
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.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2017), published 29 December 2017, Facelina sp. 01 Genus: Alder & Hancock, 1855
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Facelina_sp_01.htm