棘菊石（学名：Echioceras），又名棘角石，是生存于早侏罗纪的一属菊石，生活在大陆棚海域中，牠们可能为腐食性或捕捉移动缓慢的猎物为食。[3]其化石分布于加拿大和英国等地。[2]
特征
棘菊石的壳反旋程度很大，并有许多壳阶和浅浅的核心。侧面有短而直的肋条，但没有延伸到低矮龙骨的腹棱上。壳的反旋结构显示其不适合快速游动。[3]
物种[2]
- Echioceras delicatum Buckman, 1914
- Echioceras intermedium Trueman and Williams, 1925
- Echioceras raricostatum Zieten, 1831
参考文献
外部链接
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