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Trilobites

Trilobites, meaning "three lobes,” are a well-known fossil group of extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. The first appearance of trilobites in the fossil record was 521 million years ago and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline during the Devonian, 350 million years ago.