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This species is Gymnodoris sp. 12 in IPN, page 152.
There are pictures of it from the Red Sea and from the Marshall Islands online.
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 21 June 2017, Gymnodoris sp. 14 Genus: Stimpson, 1855
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Gymnodoris_sp_14.htm