Bactritida

Bactritida is a small order of more or less straight-shelled (orthoconic) cephalopods that first appeared during the Emsian stage of the Devonian period (390 million years ago) and persisted until the Carnian stage of the Triassic period (235 million years ago). They are considered ancestors of the ammonoids, as well as of the coleoids (octopus, squid, cuttlefish, and the extinct belemnites).

单词	Bactritoidea
释义	Bactritoidea 英汉-汉英词典杆石超目词组 \| 习惯用语您要查找的是不是： bacteria n. 细菌 bactericide n. 杀菌剂 bactericidal adj. 杀菌的 bacteriological adj. 细菌学的；细菌学上的网络短语: Bactritoidea 杆石亚纲英语百科 Bactritida Bactritida is a small order of more or less straight-shelled (orthoconic) cephalopods that first appeared during the Emsian stage of the Devonian period (390 million years ago) and persisted until the Carnian stage of the Triassic period (235 million years ago). They are considered ancestors of the ammonoids, as well as of the coleoids (octopus, squid, cuttlefish, and the extinct belemnites).
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Bactritoidea

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网络短语:

Bactritida