Plastron

Definition

A special type of structure found in some aquatic insects that acts as a physical gill, allowing them to extract oxygen from the water.

Etymology

From French 'plastron', meaning 'breastplate', implying a protective or covering structure.

Example

Water beetles like Dytiscidae use a plastron to remain submerged while still obtaining oxygen from the water.

Synonyms

• Physical gill

Related Terms

• Aquatic insects
• Oxygen extraction
• Respiration

Usage Notes

Plastrons are generally composed of a layer of hydrophobic hairs or structures that trap a thin layer of air against the body of the insect.