gonopod

zoology

Also known as: gonopodium

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Last updated

June 29, 2026

Quick Summary

In zoology, a gonopod is an appendage found in many arthropods that has been modified to function as a copulatory organ. This specialized appendage plays a crucial role in the reproductive process by aiding in the transfer of sperm during mating.12

While the term "gonopod" specifically refers to this modified appendage, it's part of the broader reproductive systems within the animal kingdom. Many arthropods, like crustaceans and insects, are dioecious, meaning they have separate sexes. However, variations exist, with some species being hermaphroditic or reproducing parthenogenetically. The presence and form of gonopods are adaptations that facilitate successful sexual reproduction in these diverse groups.2

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reproductive behaviour
Crustaceans
… have secondary genital appendages called gonopods, by which they transfer the spermatophore directly to the genital opening of the female. One millipede actually uses a “tool” in sperm transfer; the male rounds a fecal pellet, places a drop of sperm on it, and, using its legs, passes the pellet back…
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… have secondary genital appendages called gonopods, by which they transfer the spermatophore directly to the genital opening of the female. One millipede actually uses a “tool” in sperm transfer; the male rounds a fecal pellet, places a drop of sperm on it, and, using its legs, passes the pellet back…
Read More