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the Xiphosura are considered by many to be the closest living relatives of the long-extinct trilobites
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originally dubbed �Peking man� ( Sinanthropus pekinensis )
Podolia in Ukraine
Plesiosaurus, tooth, marine reptile Kentrosaurus the Xiphosura are considered byPlesiosaurs (meaning "near lizard") were flippered marine reptiles from the Mesozoic Era they were not dinosaurs. Plesiosaurs are divided into two groups: the Plesiosauroids with long, snake like necks, tiny heads, and wide bodies, and the Pliosauroids, which had large heads with very strong jaws and short necks. The first plesiosaur skeletons were found in England by Mary Anning, in the early 1800s, and were amongst the first fossil vertebrates to be
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