The habitation generation: 426–416 MaUpper Silurian
ヘミキクラスピス (Hemicyclaspis) is generic one of the Agnatha. I inhabited for (pre-doh re-world - ゴースティアン period, Upper Silurian) 416 million years ago for 426 million years. I am produced from Canada ヌナブト associate state and Great Britain .
Full length is around 15cm. The side and the parietal area of the head former had the structure thought to be the sensory organ. Pectorals develop well. The dorsal fin resists a leading edge only in one engine backward; was thorny .
I do not have a projection to be prolonged backward from the head former such as the Kaffa RAS piss. Therefore, the place of origin is placed as the sisters group of クレード called Cornuata with this projection (Cornual processes) .
This article is taken from the Japanese Wikipedia ヘミキクラスピス
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