Mandible - Mandible

Japanese: 大あご - おおあご
Mandible - Mandible

…The prototype has a pair of appendages, but the mouthparts may be fused secondarily. The mouthparts of crustaceans and myriapods consist of an upper lip, a pair of mandibles, and a pair of first and second mandibles, and in more advanced species several pairs of maxillae are added. In insects, the mouthparts consist of an upper lip, a pair of mandibles, a pair of mandibles, a lower lip, and a hypopharynx (tongue), and the pair of lower lips are fused in the middle. …

*Some of the terminology that mentions "jaw" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…付属肢は1対ずつあるのが原型であるが,口器では二次的に癒合するものもある。甲殻類や多足類の口器は一つの上唇,1対の大あご,1対ずつの第1・第2小あごからなり,高等なものには何対かの顎脚が加わる。昆虫類では上唇・大あご・小あご・下唇・下咽頭(舌)からなっていて,1対の下唇は真ん中で癒合する。…

※「大あご」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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