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Tremataspis
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・ Trematocara variabile
・ Trematocara zebra
・ Trematoceras
・ Trematochampsa
・ Trematochampsidae


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Tremataspis : ウィキペディア英語版
Tremataspis

''Tremataspis'' is a genus of an extinct osteostracan agnathan from the Silurian period of what is now Estonia.

''Tremataspis'' was about in length, and had an armored shield covering its head. Compared with its relatives, the shield was unusually elongated, covering the whole front of the body, and was more rounded in shape. It is thought that ''Tremataspis'' used its rounder shield to burrow in the ocean floor, searching for food. Because the shield consisted of one solid piece, it probably did not grow during the animal's life; presumably, the larvae lacked the shield, which only appeared later in life.
==References==



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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