But despite their past abundance, ammonoids and their behavior still remain something of a mystery to scientists. ![]() ![]() The marine creatures were so numerous and evolved at such a rapid pace that paleontologists often use ammonoids as index fossils-specific species that mark particular swaths of prehistory, allowing scientists to date layers of rock by identifying the ammonoid fossils. From about 66 to 409 million years ago, thousands of species of these shelled cephalopods thrived in seas all over the planet. Although ammonoids died out around the same time as most dinosaurs, new computer models are revealing how these marine animals moved through the water.Īmmonoids are one of the world’s greatest evolutionary success stories.
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