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Trilobites are the single most diverse group of extinct organisms that ever existed, period! The smallest known trilobite is just three millimeters long, while the largest type grew to a length of 70 centimeters (over two feet long!).
Trilobites probably arose from a soft bodied ancestor in the Pre-Cambrian. The first actual trilobites fossils found are from the Cambrian. Based on the variety of Early Cambrian fossils and the wide distribution, trilobites probably evolved sometime in the Pre-Cambrian.Once Trilobites made their appearance, they dominated the Paleozoic seas, many new orders and families quickly appeared.rilobites probably arose from a soft bodied ancestor in the Pre-Cambrian. The first actual trilobites fossils found are from the Cambrian. Based on the variety of Early Cambrian fossils and the wide distribution, trilobites probably evolved sometime in the Pre-Cambrian.