Genital coevolution between the male and female in Bittacidae (Insecta: Mecoptera)
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The adults of Bittacidae assume a unique mating posture, by which the male twists his abdomen about 180° to contact the female genitalia in a belly-to-belly position. The males have an extremely elongated penisfilum, which enters the slender spermathecal duct... ...
