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The specimen #2 has lost its 'tail', this is possibly the reason why it is not on its food source.
Very similar is Oxynoe viridis (Pease, 1861) which differs by blue spots and by white papillae.
It is reported to feed on Caulerpa racemosa algae.
Oxynoe spp. autotomize their tail when they are disturbed just like Lobiger spp. autotomize the ‘lobes’ on their parapodia. See more
on autotomy at Bill Rudman's Sea-Slug Forum.
How to cite:
Köhler, E. (2018), published 20 March 2018, Oxynoe sp. 02 Genus: Rafinesque, 1814
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Oxynoe_sp_02.htm