Petiole (insect anatomy)

The sand wasp Ammophila sabulosa has an exceptionally long petiole.
This Acanthomyrmex ant has a petiole and postpetiole

In entomology, petiole is the technical term for the narrow waist of some hymenopteran insects, especially ants, bees, and wasps in the suborder Apocrita.

The petiole can consist of either one or two segments, a characteristic that separates major subfamilies of ants.