Thysanozoon sp. 02  Genus: Grube, 1840

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I have been scanning through all websites on flatworms, but I did not find a picture of a similar species, maybe there are some at NUDIPIXEL within the 629 Unidentified polyclad flatworm pictures.
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. - it looks a little bit like the Mediterranean species Thysanozoon brocchii (Risso, 1818), which has been also recorded from the Gulf of Mexico, from South Africa, and New Zealand, but is clearly different.