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The above specimen was identified by Marcela Bolaños in the facebook group Marine Flatworms,
here is her comment:"Beautiful specimen!!! Maybe Stylochidae?! I don't know :( Do you have a ventral picture?"
and on another species:"We would need to check other external features as pharynx and eyes to at least determine the family. I can't really tell only with the pictures we need histology. Acotyleas do not cooperate very much!"