Most extreme female penis is found on cave lice

Insect’s organ can be 15 percent the length of the body, extract sperm from males

Neotrogla bark louse

HERS, NOT HIS  A small female Neotrogla bark louse extends an inflatable, penislike organ (less than a millimeter long, shown in orange), which fits into a vaginalike pocket inside the male of her species and collects his sperm.  

Courtesy of K. Yoshizawa

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