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Laurer's canal is a part of the reproductive system of trematodes, analogous to the vagina. Trematodes are a class of worm-like parasites divided into two subclasses, Aspidogastrea and Digenea. In Digeneans, Laurer's canal opens from the dorsal surface of the body. In some Aspidogastreans, the canal ends in a blind ended sac. Laurer's canal may be used by the flukes during copulation, but more normally sperm enters the female system via the common genital atrium, , either during copulation, or self-fertilisation.
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