Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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Upcoming Events

National Moth Week photos of insects and people. Here's how to add your images.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa



Ant Worker Morphology Ant Worker Morphology--alitrunk and petiole ant - Ponera pennsylvanica
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.
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)).