Anal valves

Definition

Structures located at the posterior end of an insect's abdomen, playing a role in excretion and, in some species, assisting in the control of movement or copulation.

Etymology

From Latin 'anus', meaning 'ring' or 'circle', and 'valva', meaning 'a leaf of a door'.

Example

During the dissection of the beetle, the anal valves were clearly visible and appeared to facilitate its excretory functions.

Synonyms

• Proctiger valves

Related Terms

• Abdomen
• Excretion
• Copulation

Usage Notes

Anal valves can vary in form and function among different insect groups and are usually more developed in certain species like beetles and true bugs.