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The Plesiosauria or plesiosaurs are an order or clade of Mesozoic marine reptiles, belonging to the Sauropterygia. Plesiosaurs first appeared in the latest Triassic Period

The Plesiosauria or plesiosaurs are an order or clade of Mesozoic marine reptiles, belonging to the Sauropterygia. Plesiosaurs first appeared in the latest Triassic Period

Superbly preserved Plesiosaurus fossil, how fast could they swim?

Superbly preserved Plesiosaurus fossil, how fast could they swim?

Pterosaur. Exchange from the British Museum, 1902. Annual report of the American Museum of Natural History for the year 1909. Issued 1910.

Pterosaur. Exchange from the British Museum, 1902. Annual report of the American Museum of Natural History for the year 1909. Issued 1910.

Suchomimus ("crocodile mimic") is a genus of large spinosaurid dinosaur with a crocodile-like mouth that lived between 121–112 million years ago, during the late Aptian stage of the Cretaceous period in Africa.[1]Cast of the skull, Dinosaur Discovery Museum

Suchomimus ("crocodile mimic") is a genus of large spinosaurid dinosaur with a crocodile-like mouth that lived between 121–112 million years ago, during the late Aptian stage of the Cretaceous period in Africa.[1]Cast of the skull, Dinosaur Discovery Museum

Prehistoric marine reptiles were once living sea serpents.

Prehistoric marine reptiles were once living sea serpents.

http://www.oceansofkansas.com/Plesiosaurs/Arkansas/PolyPaddle.jpg    polycotylid paddle

http://www.oceansofkansas.com/Plesiosaurs/Arkansas/PolyPaddle.jpg polycotylid paddle

Utahraptor is one the largest member of the Dromaeosauridae family. The skull cast measures 0.53m. This specimen is from Yellow Cat Quarry, Cedar Mountain Formation in Utah.

Utahraptor is one the largest member of the Dromaeosauridae family. The skull cast measures 0.53m. This specimen is from Yellow Cat Quarry, Cedar Mountain Formation in Utah.

An entire pliosaur skeleton that is OPALIZED!  Pliosaurs are actually aquatic carnivorous reptiles, not dinosaurs. 'Eric' was a small, short-necked pliosaur and and was discovered by an opal miner in Coober Pedy in 1987. 'Eric' is one of the most complete opalised vertebrates known and became part of the fossil collection of the Australian Museum in 1993.

An entire pliosaur skeleton that is OPALIZED! Pliosaurs are actually aquatic carnivorous reptiles, not dinosaurs. 'Eric' was a small, short-necked pliosaur and and was discovered by an opal miner in Coober Pedy in 1987. 'Eric' is one of the most complete opalised vertebrates known and became part of the fossil collection of the Australian Museum in 1993.

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