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This might be a species of Tritonia Cuvier, 1797, it looks somehow similar to IPN Tritonia sp. 1, but it looks as well somehow similar to species of Marionia, I am not sure - I keep it as Tritoniidae sp. 04, until I know more.
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 January 2017, Tritoniidae sp. 04 Family: Lamarck, 1809
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Tritoniidae_sp_04.htm