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First Female Insect Discovered With 'Penis'
Female insects have been discovered with penis-like sex organs that insert into a male to suck out sperm.
The Neotrogla is the first example of an animal with sex-reversed genitalia.
The female's complex reproductive structure, called a gynosome, is used to suck out sperm from the male's vagina-like opening.
Copulation between the insects - found in dry caves in eastern Brazil - lasts between 40-70 hours.
The researchers' findings were published in the latest edition of Current Biology.
The insects feed on bat droppings and possess what researchers have called an "evolutionary novelty".
Kazunori Yoshizawa, who led researchers from Japan's Hokkaido University, said the females controlled the entire mating process.
"Because the female anchoring force is very strong, a male's strong resistance may cause damage to his genitalia.
"Therefore, it is very likely that entire mating processes are controlled actively by females, whereas males are rather passive."
He added: "Females of Neotrogla likely represent the most macho females among animals discovered to date."