Last Updated：2025/12/02
In Pseudobiceros hancockanus, penis fencing is a mating behavior in which each flatworm attempts to pierce the other's epidermis with an extendable stylet to inseminate it.
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In Pseudobiceros hancockanus, penis fencing is a mating behavior in which each flatworm attempts to pierce the other's epidermis with an extendable stylet to inseminate it.
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