The Ammonoidea can be divided into six orders, listed here starting with the most primitive and going to the more derived: Iridescent ancient ammonite fossil on display at the American Museum of Natural History, New York City, around 2.5 feet in diameter This suture type is characteristic of Jurassic and Cretaceous ammonoids, but extends back all the way to the Permian. Ammonoids of this type are the most important species from a biostratigraphical point of view.
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