Aedeagus
![Photomicrograph of the aedeagus of water scavenger beetle Tormissus linsi (from above)](/Images/godic/202412/20/Tormissus_linsi_aedeagus_dorsal5546.jpg")
An aedeagus (plural aedeagi) is a reproductive organ of male insects through which they secrete sperm from the testes during copulation with a female insect. Very loosely, it can be thought of as the insect equivalent of a mammal's penis, though the matter is actually quite more complex.