modified inner portions of the pelvic fins in sharks, rays, and chimaeras; used for sperm transfer to female

appendages at the end of a male Odonata used to grasp the female's head (Anisoptera) or prothorax (Zygoptera) during mating; made up of cerci and epiproct in Anisoptera and cerci and paraprocts in Zygoptera.

Paired extensions of the pelvic fins in males, adapted for insertion into the female's cloaca during copulation. See also Tenaculum.

Appendages at the end of the abdomen of males to secure the female during mating

Are structures found in pairs at the end of the abdomen in an adult male butterfly. These structures are used as the male is coupling with the female, and "clasping" the end of the abdomen of the female and allowing him to remain attached throughout the coupling process.

Claspers are modified organs that enable the two sexes to clasp to one another during mating. Male sharks have claspers.