Trilobite fossil. Fossil of a trilobite (Eldredgeops crassituberculata) from the Devonian period (around 370 million years ago), showing the animal's segmented body. Trilobites are extinct hard-shelled, segmented arthropods that lived in ancient seas. They are considered one of Earth's earliest, complex life-forms and are one of the most well-known creatures of the Palaeozoic Era. Trilobites existed between the Cambrian and Permian periods around 542-250 million years ago, and were mainly bottom-feeding, scavengers.
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