Ancient scorpion (Pterygotus) emerged in the mid period of the Paleozoic, approximately 400 million years ago. Unlike the scorpionin general, simpler forms of ancient scorpions. His body consists ofmany segments of the thin shell protected. Another difference is thesize of the bodies of some ancient scorpion species that reached100 times the present size of the scorpion, 2 to 3 meters. In addition, ancient scorpions also live in the water.
Living Pterygotus contemporaries with sharks purba.Ia haveserrated claws to catch mangsanya.seperti mentioned Pterygotusbody length can reach 2 meters . Although invertebrates, Pterygotus have hard outer frame



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