Pterygotus was a predatory sea scorpion that lived all over the world from the Silurian to Devonian Eras.

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Photo credit: © Corey Ford / Alamy / Afripics
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Keywords: animal, aquatic, arthropod, buffaloensis, burgess, carnivorous, creature, devonian, era, evolution, extinct, extinction, fish, illustration, image, invertebrate, large, life, lobes, marine, nature, ocean, organism, paleoart, paleozoic, picture, prehistoric, primeval, primitive, pterygotus, scorpion, sea, shale, silurian, swimming, themes, undersea, underwater