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Exclusive: There’s a new T. rex in town—and this giant beast ruled the seas

Researchers remeasured 300 mosasaur specimens and found Tylosaurus rex, a giant 43-foot predator with serrated teeth and powerful jaws.

  • On Thursday, researchers from the American Museum, Perot Museum, and Southern Methodist University announced the identification of Tylosaurus rex, a massive marine reptile that dominated ancient seas nearly 80 million years ago.
  • Amelia Zietlow, a paleontologist at the American Museum of Natural History, initiated the study after noticing misidentified fossils, leading her team to remeasure 300 specimens while validating a theory originally proposed by John Thurmond in the 1960s regarding Texas-based tylosaurs.
  • Measuring up to 43 feet long, the predator featured finely serrated teeth and robust neck muscles; fossils like The Black Knight display evidence of violent combat injuries inflicted by members of its own species.
  • Famous specimens including Bunker at the Kansas National History Museum and Sophie at the Yale Peabody Museum are now reclassified as Tylosaurus rex, updating museum collections across multiple institutions.
  • Zietlow argued the findings necessitate a broader reassessment of mosasaur evolution, stating "this discovery is not just about naming a new species" but modernizing the tools used to study these iconic marine reptiles.
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WFAA 8abc broke the news in Dallas, United States on Thursday, May 21, 2026.
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