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Tergum : ウィキペディア英語版
Tergum

A tergum (Latin for "the back"; plural terga, associated adjective tergal) is the dorsal portion of an arthropod segment other than the head. The anterior edge is called the ''base'' and posterior edge is called the ''apex'' or ''margin''. A given tergum may be divided into hardened plates or sclerites commonly referred to as tergites.〔McCafferty (1983).〕 So, for example, in a thoracic segment, the tergum may be divided into an anterior notum and a posterior scutellum. Lateral extensions of a tergite are known as paranota (Greek for "alongside the back") or ''carinae'' (Latin for "keel"), exemplified by the so-called flat-backed millipedes of the order Polydesmida.
In crustaceans, the tergum is known as a ''pleuron'' when it overhangs the insertion of the limb on each side as a free plate.
In contrast to the tergum, the ventral portion of a segment is called the sternum.
==Examples==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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