Stylet (anatomy)

Stylet (anatomy)

A stylet is a rigid structure found in certain anatomical structures of some animals, particularly invertebrates. In general, the term refers to a sharp, needle-like piece that is often associated with the delivery of venom in various species.

Function

The primary function of a stylet is to facilitate the delivery of venom or other substances into the body of another organism. This is achieved by the stylet piercing the skin or other protective layers of the target organism, allowing the venom or other substance to be injected directly into the body.

In some species, the stylet may also serve a secondary function in feeding. For example, in certain species of mosquitoes, the stylet is used to pierce the skin of a host organism and draw blood for nourishment.

Structure

The structure of a stylet can vary greatly depending on the species. In general, however, it is a long, thin, and rigid structure that is capable of piercing the skin or other protective layers of a target organism. It is typically located within the mouthparts of the organism, although in some species it may be located elsewhere.

In some species, the stylet may be hollow, allowing venom or other substances to be delivered through the stylet itself. In other species, the stylet may be solid, with the venom or other substances being delivered through a separate structure.

Examples

Examples of organisms that possess a stylet include certain species of snails, nematodes, and mosquitoes. In each of these examples, the stylet is used to deliver venom or other substances into the body of another organism.

See also

• Venom delivery apparatus
• Proboscis