In entomology, the rear abdominal section of certain insects, particularly wasps, that is relatively loose or segmented.
From Greek χαλαστός (khalastos, 'loosened') and γαστήρ (gaster, 'belly'), a scientific term combining roots to describe the structure of an insect's abdomen.
This strange technical term captures how scientists literally describe insect body architecture—the chalastogastra in wasps includes their stinger and is designed for maximum flexibility in combat.
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