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Pretty similar is Goniodoridella savignyi Pruvot-Fol, 1933, which differs by a median londitudinal orange ridge.
This species is as Okenia sp. 1 in IPN, page 132,
it was posted on 7 June 2011at these websites as Okenia sp. A Genus: Menke, 1830, and changed on 31 July 2011
into Okenia sp. 01 Genus: Menke, 1830.
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 12 November 2017, Okenia sp. 01 Genus: Menke, 1830
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Okenia_sp_01.htm