Trilobites belong to the class known as trilobita. They are one of the oldest known arthropods, and have been aged as far back as 521 million years old (the Early Cambrian period.) It’s believed that trilobites finally went extinct around 252 million years ago. There were more varieties of trilobite than we can list here, some evolved to swim and feed upon plankton, others were seabed scavengers and predators. One of the largest trilobite fossils ever found was nearly 18 inches long and weighed in at nearly 10 pounds!
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