Trilobites. Computer illustration of a collection of trilobites on a sea bed. Trilobites are extinct hard-shelled, segmented arthropods that lived in the Earth's ancient seas between the Cambrian and Permian Periods (around 542-250 million years ago). They were mainly bottom-feeding scavengers and are considered one of Earth's earliest complex life-forms and are one of the most well-known creatures of the Palaeozoic Era.
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