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Thanks for identification to Terrence M. Gosliner. Terry wrote in November 2003 he is working on it with his student Rebecca Johnson.
This species is as Hypselodoris sp. 10 in IPN at page 269,
it was posted on 15 December 2003 at these websites as Hypselodoris sp. A Genus: Stimpson, 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 23 August 2017, Hypselodoris sp. 01 Genus: Stimpson, 1855
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Hypselodoris_sp_01.htm