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petiole

Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (P)
No Taxon petiole
Explanation of Names
From French petiole, a foot-stalk of a leaf. Latin , accusative case of petiolus, little stalk.
Identification
petiole noun, adjective petiolar - The "waist" of many hymenoptera--the part of the abdomen that connects the gaster to the thorax.
The term petiole is most commonly used to refer to the constricted first (and sometimes second) metasomal segment of members of the Hymenopteran suborder Apocrita (hymenoptera other than sawflies and horntails); it may be used to refer to other insects with similar body shapes, where the metasomal base is constricted. Occasionally, it is alternatively called a pedicel (or peduncle), but in entomology, that term is more correctly reserved for the second segment of the antenna (Wikipedia: Petiole (insect)).

Diagrams and photos illustrating the petiole: