ectognathous

Definition

Having external mouthparts; typically refers to insects whose mouthparts are visible and not retracted into the head.

Etymology

From Greek 'ektos', meaning 'outside', and 'gnathos', meaning 'jaw'.

Example

Ectognathous insects, such as beetles, have mouthparts that are clearly visible and extend outside of the head capsule.

Related Terms

• Entognathous
• Mouthparts
• Jaws

Usage Notes

Ectognathous mouthparts are a key characteristic in distinguishing between certain groups of insects.