New Sea Tyrant: Meet Tylosaurus rex, a 43-foot Mosasaur
Scientists describe a new mosasaur species, Tylosaurus rex, from 80-million-year-old Texas fossils that could reach about 43 feet in length, possessed finely serrated teeth and powerful jaws, and likely dominated ancient seas; several specimens previously labeled as Tylosaurus proriger have been reclassified as this new species, highlighting ongoing revisions in mosasaur evolution and the Western Interior Seaway ecosystem.