Mating flatworms Thysanozoon nigropapillosum

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During a night dive we found these 2 mating flatworms (Thysanozoon nigropapillosum). If you look closely (slow motion parts), you can spot a behavior that is called penis fencing , only practiced by flatworms that are hermaphroditic; each individual has both egg-producing ovaries and sperm-producing testes. One organism will inseminate the other. The sperm is absorbed through pores or sometimes wounds in the skin from the partner's stylet. • Video by: Pim van Schendel​ • #Murex #Indonesia #wonderfulindonesia #scubadiving #flatworms

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