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Ammonites were sea creatures that belonged to the class Cephalopoda and phylum Mollusca. The Mesozoic era saw an abundance of ammonites, which became extinct at the end of the Cretaceous period around 64 million years ago.
The ammonite's shell has chambers that were separated from one another by septa (singular: septum). These made the shell stronger and prevented external water pressure from crushing it. Ammonites presumably couldn't survive in depths more than 100 m. Ammonites varies greatly in size, from the incredibly tiny to human-height. For instance, full adults of the Late Jurassic Nannocardioceras seldom measure more than 20 mm in diameter. Huge ammonites, for instance, have been found at the other extreme. The Late Cretaceous fossil Parapuzosia seppenradensis has a 1.95 m diameter. In 1895, it was discovered in Germany. This specimen's diameter, if complete, would have been about 2.55 meters.
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