Agoniatitida

An image showing the siphuncle, the tube which connects the current living shell to the previous ones.

Agoniatitida, also known as the Anarcestida, is the ancestral order within the cephalopod Subclass Ammonoidea, that lived in what would become Africa, Asia, Australia, Europe, and North America during the Devonian from about 410—385 mya, existing for approximately 25 million years.

单词	Agoniatitida
释义	Agoniatitida 英语百科 Agoniatitida Agoniatitida, also known as the Anarcestida, is the ancestral order within the cephalopod Subclass Ammonoidea, that lived in what would become Africa, Asia, Australia, Europe, and North America during the Devonian from about 410—385 mya, existing for approximately 25 million years.
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