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单词 ceratite
释义

ceratite

英汉-汉英词典
n. 齿菊石
词组 | 习惯用语
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  • cerate n. [药]脂蜡合剂;蜡膏 adj. 有蜡膜的;蜡的
  • certitude n. 确信;确实
  • literati n. 文人(literatus的复数);文学界
  • iterative adj. 重复的,反复的,迭代的 n. 反复体

网络短语:
ceratite 齿菊石
英语百科

Ceratitida

Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post Triassic ammonites.

Ceratitids overwhelmingly produced planospirally coiled discoidal shells that may be evolute with inner whorls exposed or involute with only the outer whorl showing. In a few later forms the shell became subglobular, in others, trochoidal or uncoiled. Sutures are typically ceratitic, with smooth saddles and serrate or digitized lobes. In a few the sutures are goniatitic while in others they are ammonitic.

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