Facial lines

Japanese: 顔線 - がんせん
Facial lines

…The transverse groove just before the cervical ring is called the cervical groove, and is almost always complete even in evolved forms. The head has a suture that divides the carapace into two or three parts as a molting structure, called the facial line. The position of the facial line is almost constant within a species, but does not correspond to a group in phylogenetic classification. …

*Some of the terminology that refers to "facial lines" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…頸環直前の横溝は頸溝と称し,進化型でもほとんど常に完全である。 頭部には,脱皮構造として背甲を二~三分する縫合線があり,顔線という。顔線の位置は種属についてはほぼ一定しているが,系統分類によるグループとは一致しない。…

※「顔線」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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