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I place it tentatively in the genus Thysanozoon Grube, 1840, because of the papillae, it might be as well a species of Acanthozoon Collingwood, 1876, which possess only a single male copulative organ contrary to Thysanozoon.
I have added a second picture to show the pseudotentacles and the cerebral eyespots (behind the pseudotentacles) which confirmed it is a flatworm.
How to cite:
Köhler, E. (2017), published 11 June 2017, Thysanozoon sp. 08 Genus: Grube, 1840
available from https://www.Philippine-Sea-Slugs.com/Look-alike/Platyhelminthes/Thysanozoon_sp_08/Select.htm