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Certain fish have a special mating preference

ith large genitalia. If true, he said, the evolution of this mating preference might help explain the evolution of swords in male swordtail fishes. Swords are conspicuous, elongate projections of the tail fin and are known to be subject to female mate choice.

"Swords resemble gonopodia in overall shape, and thus might effectively represent gonopodium mimics that evolutionarily exploit a pre-existing sensory bias in females," he said. "That is, male ornamentation of the tail fin may have evolved largely due to the pre-existing preference for an elongate structure of a similar shape -- the gonopodium."


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Source:Washington University in St. Louis


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