New Mosasaur Species Identified
Scientists have formally described a previously unknown mosasaur species, named Tylosaurus rex (T. rex), based on fossils unearthed in northern Texas. The remains are roughly 80 million years old, with the newly identified creature reaching an impressive 12 meters in length. This discovery emerged from collaborative research involving the American Museum of Natural History, the Perot Museum of Nature and Science in Dallas, and Southern Methodist University. The name Tylosaurus rex was chosen in honor of paleontologist John Thurmond, who informally referred to giant tylosaur specimens as Tylosaurus Thalassotyrannus back in the 1960s.
Research and Contributors
Lead author Amelia Zietlow, a researcher at the Wisconsin-based Castle Museum, spearheaded the study. Zietlow initiated this work while pursuing her doctorate in comparative biology at the Richard Gilder Graduate School of the American Museum of Natural History. She remarked:
'Everything is bigger in Texas, and that apparently holds true for mosasaurs as well.' - Amelia Zietlow
Additionally, the team developed a revised dataset for analyzing evolutionary links among mosasaurs, as the primary dataset in this field had remained unchanged for the past three decades.
Co-author Ron Tykoski, Vice President of Science and Curator of Vertebrate Paleontology at the Perot Museum, emphasized that 'beyond being enormous—roughly twice the length of the largest great white sharks—our T. rex turned out to be a far more brutal animal than other mosasaurs.' According to Tykoski, examining fossils collected across northern Texas uncovered new evidence of aggression in this species, a trait not previously seen in other tylosaur specimens.
One fossil housed in the museum’s collection had been mistakenly identified as Tylosaurus proriger; the original T. proriger specimen is kept at Harvard University’s Museum of Comparative Zoology. Over a dozen similar fossils are now linked to this new species, which inhabited what is now Texas roughly 80 million years ago.
Zietlow noted: 'This discovery isn’t just about naming a new species. It highlights the need to revisit long-held assumptions about mosasaur evolution and update the tools we use to study these iconic marine reptiles.'
The identification of the new mosasaur species Tylosaurus rex marks a significant contribution to paleontology, not only adding fresh data to existing knowledge about this group of marine reptiles but also potentially reshaping our understanding of their evolution and behavior. The analysis of fossils, along with the refinement of research methods in this field, could pave the way for future discoveries. This study underscores the value of interdisciplinary scientific collaboration and the necessity of critically re-evaluating older data in scientific research.
The discovery of how skull structure influenced limb evolution in theropods sheds light on the complex adaptations of prehistoric creatures. Just as the Tylosaurus rex showcases unique traits that set it apart from other mosasaurs, understanding the evolutionary pressures on different species helps us appreciate the diversity of life during the age of the dinosaurs.