| Cimoliasaurus Temporal range: Late Cretaceous,
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| Cimoliasaurus magnus vertebrae. | |
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| Genus: | †Cimoliasaurus Leidy, 1851
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| Type species | |
| †Cimoliasaurus magnus Leidy, 1851
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Cimoliasaurus was a plesiosaur that lived during the Late Cretaceous (Maastrichtian) of the eastern United States, with fossils known from New Jersey, North Carolina, and Maryland.