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reptiles that lived at the same time as dinosaurs, and though they are often lumped together with the "terrible lizards," they were not dinosaurs . although plesiosaurs are not considered to have direct, living descendants, they live today in the human imagination, in books, films, and even as the source
the body. the pliosauridae (pliosaurs) had a short neck with large, elongated head and may have been at home in deeper waters. however, in recent classifications, one short-necked and large-headed cretaceous group, the polycotylidae, are included under the plesiosauroidea, rather than under the traditional...
https://www.newworldencyclopedia.org/entry/Plesiosaur