Ammonites are the most well-known fossils and typically have a grooved spiral shell. These creatures lived in the seas between 240 and 65 million years ago and went extinct with the dinosaurs. The name 'Ammonite' derives from the Greek Ram-horned deities called Ammon. The living relatives of the ammonites are a group of predators known as cephalopods, such as the octopus, squid, cuttlefish, and nautilus.
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