Geologic period: Jurassic
Rudists, Titaosarcolites, Paleoctopus, Placenticeras, ammonites
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Rudists are a group of bizarrely shaped marine heterodont bivalves that arose during the Jurassic, and became so diverse during the Cretaceous that they were major reef-building organisms in the Tethys Ocean. They were among the many animal groups that perished during the Cretaceous–Tertiary extinction event. Learn more!