Claspers
These special extensions of the pelvic fin are unique to cartilaginous fishes.
Only males have claspers, which Aristotle thought were used to clasp the female
during mating (hence the name). In fact, during mating, the male passes one of
his two claspers over his cloaca—the chamber into which the reproductive,
intestinal, and urinary systems discharge in many fishes—thus forcing semen
into a groove in the clasper. He then rotates this clasper so it's facing
forward and inserts it into the cloaca of a receptive female.
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