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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!).
In most trilobites moulting was accomplished by splitting the head shield along lines of weakness (called facial sutures) that run along the visual surface of the eye. Legs of trilobites. The legs are preserved in fewer than 20 species of trilobites, but leg structure confirmed the group's position within Arthropoda.