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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 FIRST APPEARED AROUND 540 MILLION YEARS AGO. Their debut roughly coincided with the dawn of the Cambrian period. During this game-changing chapter in Earthâs history, multi-celled organisms went through an apparent explosion in diversity, or at least an explosion in life forms that leave fossils. New creaturesâincluding a barrage of mollusks and arthropodsâseem to have evolved at an unprecedented rate.