Hymenoptera are characteristed by a thin 'waist' between the thorax and the abdomen. Following the thin waist the abdomen gets thicker and this region is called the Gaster.

A photograph of the Spider-hunting Wasp (_Auplopus carbonarius_) with its prey.

The Spider-hunting Wasp (Auplopus carbonarius) with its prey. The thin waist and gaster, distinctive of Hymenoptera, are clearly visible.
Photograph by Fritz Geller-Grimm licensed under Creative Commons.

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