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Hainosaurus

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Hainosaurus is an extinct genus of marine lizard belonging to the mosasaur family. It was one of the largest
New mosasaur
mosasaurs, though its size has been revised more than once. At first it was estimated to be 17 metres (56 ft), and the largest mosasaurid. During the 1990s, its size was revised to 15 metres (49 ft) long. More recently, Johan Lindgren estimated that it reached lengths of up to 12.2 metres (40 ft). It was one of the top marine predators of the Late Cretaceous. Like other giant mosasaurs, this giant predator preyed on turtles, plesiosaurs, pterosaurs, cephalopods, sharks, fish, and smaller mosasaurs. Hainosaurus was a member of the Tylosaurinae, and it was related to the wholly North American Tylosaurus. However, it had more vertebrae from the neck to the part of the tail with chevrons (53) than Tylosaurus. Both genera are large marine Hainosaurus' tail has less chevron-bearing vertebrae, making it shorter than that of Tylosaurus. The only known species of Hainosaurus is H. bernardi, named after the Léopold Bernard, owner of the phosphate chalk exploitation where the fossil was unearthed. In a paper published in 2016, Hainosaurus was considered congeneric with Tylosaurus, but not everyone is convinced.

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