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Zhongjianichthys : ウィキペディア英語版 | Zhongjianichthys
''Zhongjianichthys rostratus'' is an extinct basal chordate that lived in the Cambrian period, approximately 530 million years ago. It is sometimes regarded as an early fish, and therefore an ancestor to all vertebrates. == Physical characteristics == The eyes are located behind the antero-dorsal lobe and the mouth apparently did not have a jaw. It lacked scales, and had a thick skin. The ventral fin is low in height, and runs much of the body's length.
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「Zhongjianichthys」の詳細全文を読む
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