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棱菊石目

棱菊石目
化石时期:390–251 Ma
泥盆纪二叠纪
化石
科学分类 编辑
界: 动物界 Animalia
门: 软体动物门 Mollusca
纲: 头足纲 Cephalopoda
亚纲: 菊石亚纲 Ammonoidea
目: 棱菊石目 Goniatitida
Hyatt, 1884
亚目
  • 棱菊石亚目 Goniatitina
  • 圆叶菊石亚目 Tornoceratina

棱菊石目(Goniatitida)是一群已经灭绝的菊石类,最早出现在泥盆纪中期(大约3.9亿年前),兴盛于石炭纪二叠纪,最后于古生代末期,约2亿5100万年前灭绝。

所有的棱菊石类都拥有外壳,硬壳内部被隔板分隔成独立的壳室,壳室里可能都充满着气体。大部分的棱菊石类直径都小于15公分,甚至常常小于5公分。棱菊石类的外壳通常都具有螺旋状的花纹,与中生代菊石目菊石不同。古生代的菊石类外壳大部分只有部分螺旋花纹,有些种类甚至没有螺旋花纹。

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棱菊石目
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