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There was no size recorded for this specimen, but it is obviously small, most probably a juvenile.
This species is as Gymnodoris sp. 12 in IPN at page 152, it is known from the Red Sea and from the Marshall Islands.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
More informations on Gymnodoris sp. 09 as Gymnodoris sp. 2 are at Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 7 June 2017, Gymnodoris sp. 09 Genus: Stimpson, 1855
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Gymnodoris_sp_09.htm