Weevil penis

Weevil penis

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This image is part of the feature Battle Of The Insect Sexes
This image is part of the feature Weevil Sex

Credit: POWER AND SYRED/SCIENCE PHOTO LIBRARY

Caption: Bean weevil penis. Coloured scanning electron micrograph (SEM) of a male bean weevil's (Callosobruchus maculatus) penis. The tip (top centre) is covered in hard spines, which unfold in the female's genital tract during copulation. The spines penetrate the lining of the tract, leaving numerous puncture wounds. Mating is costly for the female; if she copulates with more than one male, she incurs extensive damage and so dies early. The male's spiny penis therefore increases his chances of siring all of the female's eggs. It may also increase the number of eggs she lays. Magnification unknown.

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Keywords: animal, bean weevil, beetle, callosobruchus maculatus, coleopteran, coloured, everted, hardened, insect, insecta, intromittent organ, invertebrate, invertebrates, male, nature, penis, scanning electron micrograph, sem, sexual reproduction, sharp, spiky, spines, spiny, unfolded, wildlife, zoology

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