ⓘ Petiole, insect anatomy. In entomology, petiole is the technical term for the narrow waist of some hymenopteran insects, especially ants, bees, and wasps in the ..


ⓘ Petiole (insect anatomy)

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

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


1. Structure

The term petiole is most commonly used to refer to the constricted first and sometimes second metasomal posterior segment of members of the hymenopteran suborder Apocrita. It is sometimes also used to refer to other insects with similar body shapes, where the metasomal base is constricted. The petiole is occasionally called a pedicel, but in entomology, that term is more correctly reserved for the second segment of the antenna; while in arachnology, pedicel is the accepted term to define the constriction between the cephalothorax and abdomen of spiders.

The plump portion of the abdomen posterior to the petiole and postpetiole in the Myrmicinae is called the gaster.

The structure of the petiole is an easy way to visually classify ants, because the major subfamilies of Formicidae have structural differences: some ants have two-segmented petioles, while others have a single-segmented petiole.


2. Other uses

Petiole may also be used in the context of wing veins, where a wing cell that is ordinarily four-sided is reduced to a triangle with a stalk the cell thus being petiolate.

The stalk at the base of paper wasp nests is also called a petiole.

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  • the class Insecta, where the Johnston s organ is found Pedicel or petiole insect the stem formed by a restricted abdominal segment which connects
  • which case the gaster begins with abdominal segment IV. Ant Information Insected arizona.edu. Archived from the original on 2014 - 10 - 07. Retrieved 2014 - 08 - 20
  • Hymenoptera is a large order of insects comprising the sawflies, wasps, bees, and ants. Over 150, 000 living species of Hymenoptera have been described
  • flowers and are not involved in pollination, generally on the leaf or petiole foliar nectaries and often in relation to the leaf venation. They are
  • forms the narrow petiole Some ants have an additional postpetiole segment, and the remaining segments form the bulbous gaster. The petiole and gaster abdominal
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  • or leaves through about 180 as they open. Resupinate leaves have the petiole or stalk twisted - respuinate flowers twist as they open. Plants in the
  • the insect and also act as sinks for nutrition that they feed on. The hackleberry gall psyllid for example, causes a woody gall on the leaf petioles of
  • It is strongly constricted posteriorly to form the articulation of the petiole and gives apocritans their distinctive shape. Propodium is the anterior