| 释义 |
1 [古生]?菊石类 有些生物如 恐龙类 ( Dinosaurs )、菊石类(Ammonoids)、和三叶虫类(Trilobites)等已经绝种多时,我们只有从化石中去了解它们,不过有时侯对其他和它们有密切关系的现存动物的研究,亦可以...
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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. 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。 - 2
Ammonoids, with their tightly coiled, spiral shells, are also widespread in the Permian fossil record. 鹦鹉螺化石，这些螺旋状的贝壳，经常分布在二叠纪的化石群中。 - 3
Then Whiteside and Ward looked at the fossil record of ammonoids, a class of creatures that resemble shelled squid and dominated Earth's oceans from 400 million to 65 million years ago. 怀特塞德和沃德也研究了菊石的化石记录。菊石室一种类似于鱿鱼的生物，四亿至五亿年之前菊石遍布地球海洋之中。
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