Trilobites - Fossil Arthropods of Distinction - By: Claudia Mann, 2008-05-17

The prolific trilobite could be called the signpost of the Paleozoic Era. This early arthropod, one of earth’s first, shows up in the fossil record in the early Cambrian Period about 450 million years ago. It flourished in the ancient seas for close to 300 million years before finally becoming extinct at the close of the Paleozoic Era.

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