Plesiosaur from R. T. Gould, THE CASE FOR THE SEA SERPENT, London 1930. Plesiosaurs were large, carnivorous aquatic reptiles. They are somewhat fancifully said to look like "a turtle with a snake threaded through its body", though they lacked a shell. They first appeared in the late Triassic period and thrived until the K-T extinction at the end of the Cretaceous. Despite being large Mesozoic reptiles, they were not a type of dinosaur. It is occasionally claimed that plesiosaurs are not extinct, although the scientific evidence for this belief is disputed; the modern sightings that are occasionally reported are usually explained as basking shark carcasses or hoaxes. 咄ortean
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