The genital papilla is an anatomical feature of the external genitalia of some animals.
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In mammals
In mammals, the genital papilla is a part of female external genitalia not present in humans, which appears as a small, fleshy flab of tissue. The papilla covers the opening of the vagina.
In fish
In fish, the genital papilla is a small, fleshy tube behind the anus present in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla.
References
Genital papilla Wikipedia(Text) CC BY-SA