Shape, Fit of Male, Female Reproductive Organs Evolve Quickly and in Concert, Leaving Size by the Wayside

Believed critical for determining which individuals can -- or cannot -- successfully reproduce with each other, genitalia not only figure prominently in the origin of new species, but are also typically the first type of trait to change as new species form. Today, new international research led by Indiana University shows that as populations and species diversify, the exact shape and fit of genitalia steals the show over size.

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