Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 5

ammonite - Classification, Life, Shell anatomy and diversity, Size, Distribution, Trivia, Terminological Note

An extinct, nautilus-like mollusc; found extensively as fossil shells from the Devonian to the Upper Cretaceous periods; shell external in life, typically a flattened spiral, divided internally by transverse walls. (Class: Cephalopoda. Subclass: Ammonoidea.)

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