Petiole (insect anatomy)

The term refers to petiole ( Stielchenglied, stalks or abdomen stalk)

• The first in the moth scale insects,
• At the waist wasps ( Apocrita ), so the Hymenoptera wasp waist, the second segment of the abdomen ( tummy). The first is anchored firmly in these insects with the thorax to the mesosoma.

For waist wasps with forward stalk -like narrowed petiole ( for example, in some grave wasps ) the rear, widened part is called Postpetiolus.

In contrast, and the third abdominal segment is referred to as Postpetiolus in some ants, if this part of the abdominal stalk (e.g., at the nodes ants). Petiole, and gaster Postpetiolus then form together the metasoma.

The Stielchenglied as movable connection between the chest and abdomen is characteristic of all ants. It also allows them greater freedom of movement of the abdomen, one hand down, allowing the spillage of defensive secretions forward, on the other hand upwards, which is particularly preferred for the supply of fragrances.