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Kronosaurus is an extinct genus of short-necked pliosaur that lived during the Early Cretaceous.
Kronosaurus is known from two skeletons and teeth. Kronosaurus had the first several conical teeth elongated to the size of fangs. Kronosaurus ate anything smaller than it. Like Plesiosaurs, Kronosaurus had a string stroke and a special stroke-style to propel it through the waves.