The male intromittent organ.

in Diptera, intromittent organ as a whole (Tuxen, after authors), intromittent organ as far as fused with penis valves (Tuxen, after Abul Nasr), or distiphallus, q.v. (Tuxen, after authors, Snodgrass); in Chironomidae (Diptera), intromittent organ resulting from combination of gonapophyses IX and surrounding phalli (Saether); in Culicidae (Diptera), central body of phallosome or distal part of phallus (Harbach and Knight); in Siphonaptera, the external part of the phallosome including the end chamber that bears a large basal apodeme (Rothschild and Traub); in Hymenoptera, bilobate intromittent organ (Gauld and Bolton), penis and penis valves (Tuxen, after Beck), or entire genitalia (Tuxen, after Timberlake).

In the male insect, the terminal part of phallus (copulatory organ).

chitinised male sexual organ of Coleoptera, often used in taxonomy for separating closely related species.

Median lobe of the male genital capsule that is surrounded by the phallobase and through which the sperm duct traverses. [drawing] [photo

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. The sperm contains capsules called spermatophores, which contain the spermatozoa. In addition to the spermatophores, in some insect species the aedeagus also discharges a spermatophylax, which serves as a nutriment to the female.