Scientists have unveiled a colossal new species of mosasaur named Tylosaurus rex, which lived approximately 80 million years ago in the ancient oceans of Texas. Measuring up to 43 feet long, T. rex is considered one of the largest mosasaurs ever discovered. The research team, including experts from the American Museum of Natural History and Southern Methodist University, found that T. rex possessed unique features such as finely serrated teeth and robust jaw muscles, suggesting it was a formidable predator. The study also highlights evidence of violent interactions among individuals of the species, with fossils showing injuries likely inflicted by other T. rex. This discovery challenges long-standing assumptions about mosasaur evolution, as researchers developed a new evolutionary framework that may prompt a reevaluation of previous studies. The findings underscore Texas as a key region for understanding ancient marine ecosystems and the evolutionary history of these powerful predators. Support for the research came from various institutions, including the National Science Foundation and the Dallas Paleontological Society.