The sex organs of a green algae Chara are the male antheridia (red) and female archegonia (brown).
The ventral side (underside) of a female American lobster, a member of the class Malacostraca. The gonopores are at the bases of the third walking leg, pointing towards the animal's tail.
The female genitalia of Lepidoptera

A gonopore, sometimes called a gonadopore, is a genital pore in many invertebrates.

- Gonopore

In general zoology, given the great variety in organs, physiologies, and behaviors involved in copulation, male genitalia are more strictly defined as "all male structures that are inserted in the female or that hold her near her gonopore during sperm transfer"; female genitalia are defined as "those parts of the female reproductive tract that make direct contact with male genitalia or male products (sperm, spermatophores) during or immediately after copulation".

- Sex organ
The sex organs of a green algae Chara are the male antheridia (red) and female archegonia (brown).

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