Cotylosaur

Japanese: コチロサウルス（英語表記）cotylosaur

A general term for reptiles belonging to the order Cotylosauria. These primitive reptiles lived from the late Paleozoic to the early Mesozoic eras. Some people believe that the amphibian Seymouria also belongs to this order. The skull generally becomes taller and gradually loses its flatness. As there is no opening called a temporal fenestra in the part of the skull behind the eyes, this species is included in the subclass Anapsida along with other orders such as Testudins. The bones behind the parietal bone degenerate, the auditory fissure disappears, and there is only one occipital condyle. The pterygoid bone of the palate develops and teeth appear.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

杯竜目Cotylosauriaに属する爬虫類の総称。原始爬虫類で，古生代後期から中生代前期にかけて生存した。両生類のセイモウリアもこれに入ると考える人もいる。頭骨は全般に高くなり，だんだんと扁平さがなくなってくる。頭蓋の両眼より後の部分に側頭窓と呼ぶ穴が開いていないので，カメ目などとともに無弓亜綱Anapsidaに含まれる。頭頂骨の後方の骨が退化し，耳裂溝は消失し，後頭顆が1個となる。口蓋の翼状骨が発達し，歯が生ずる。

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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