NEMO RAMJET / SCIENCE PHOTO LIBRARY NEMO RAMJET / SCIENCE PHOTO LIBRARY
Polycotylus marine dinosaur. Computer illustration showing an Polycotylus sp. dinosaur marine dinosaur from above (left) and below (right). This plesiosaur lived around 60 million years ago, towards the end of the Cretaceous Period, in the seas around what is now North America, Russia and Australia.
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