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In entomology, petiole is the technical term for the narrow waist of some Hymenopteran insects, especially ants, bees, and wasps. The petiole can consist of either one or two segments, a character that separates major subfamilies of ant. ==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 (ants, bees, and wasps). 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.〔(【引用サイトリンク】 title=Glossary )〕 The plump portion of the abdomen posterior to the petiole (and postpetiole in 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-segment petioles, while others have a single-segment petiole. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Petiole (insect anatomy)」の詳細全文を読む スポンサード リンク
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