Agoniatitida

Agoniatitida
Temporal range: Late Pragian – Middle Givetian
An image showing the siphuncle (which could be agoniatitid), the tube which connects the current living shell to the previous ones. They have been dead for many years as we have found fossils.
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Agoniatitida
Ruzhencev, 1957
Suborders
  • Agoniatitina
  • Anarcestina
  • Auguritina
  • Gephuroceratina
  • Gephurocerina
  • Pharciceratina
  • Timanocerina

Agoniatitida, also known as the Anarcestida, is the ancestral order within the cephalopod subclass Ammonoidea originating from bactritoid nautiloids, that lived in what would become Africa, Asia, Australia, Europe, and North America during the Devonian from about the lower boundary of Zlichovian stage (corresponding to late Pragian, after 409.1 mya) into Taghanic event during upper middle Givetian (between 385 and 384 mya), existing for approximately 25 million years.

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