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Stranger Than FictionMany insects have bizarre genitalia - the mouldable chitin that makes up insects' outer body is a versatile building material for imaginative forms. Dragonflies, for example, have structures like brushes, pipe cleaners and inflatable beach balls that scoop out rivals' sperm. "It's stranger than fiction," admits Siva-Jothy.Paired penes, though common in spiders and crustaceans, are rare in insects, says sexual-selection researcher William Eberhard of the University of Costa Rica. The earwigs' double whammy may be an ancestral throwback - like antennae and legs, penises were originally paired. Why insects evolved such a diverse repertoire of genitals nevertheless remains a bone of contention. As well as being adapted to ensure that sperm is successful, Eberhardt argues, insects' members may have been influenced by female taste. "Females discriminate amongst males on the basis of their genitalia," he says. |
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