Thysanozoon sp. 01  Genus: Grube, 1840

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There is a picture of this species from the Batangas taken by Michael D. Miller at Dr.Wolfgang Seifarth's Marine Flatworms of the World labelled as Thysanozoon/Acanthozoon sp.
I place it tentatively in the genus Thysanozoon  Grube, 1840, it might be as well a species of Acanthozoon  Collingwood, 1876, which possess only a single male copulative organ contrary to Thysanozoon.