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Keywords:trilobite, eurypterid, eurypterus, Ordovician, Devonian, ancient, animal, arthropod, background, claws, compound-eyes, era, exoskeleton, extinct, fossil, illustration, insect, large, life, nature, ocean, ordovician, painting, paleontology, permian, pincers, prehistoric, remipes, science, scorpion, sea, triassic, underwater, wildlife, zoology, fish, Cambrian, shell, chase, period, history
