在中生代,它们是海洋无脊椎动物中最繁盛的种类,尤其是菊石(Ammonites)和箭石(Belemnites)为最多。在进化中的顶峰现象是非常普遍的。
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在这一系列周期性物种灭绝事件里,白垩纪晚期恐龙和菊石的灭绝仅仅是其中一个比较严重的事件。
The late Cretaceous extinction of the dinosaurs and ammonoids was just one of the more drastic in a whole series of such recurrent extinction episodes.
伦敦小提琴商人洛里安•里昂哈德在陈列室放了一大块菊石化石。
LORIAN LEONHARD, a London violin dealer, keeps a large fossilised ammonite in his showroom.
西班牙巴塞罗那一处教堂楼梯的设计灵感就来自于菊石。
Ammonites also inspired this cathedral staircase in Barcelona, Spain.
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