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Halisaurus Mosasaur Fossils
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Halisaurus Mosasaur was first named all the way back in 1869 during a period in American paleontological history today known as the ‘bone wars’. However a year later Othniel Charles Marsh, the person who named Halisaurus, became aware of a genus of fish called Halosaurus and mistakenly came to the conclusion that Halisaurus was preoccupied, and so created the name Baptosaurus to replace it. However although very similar to Halisaurus, Halosaurus is still different enough not to cause a conflict, so Halisaurus was later resurrected as a valid name, while Baptosaurus is now a synonym to it.
