The identification of Jörmungandr walhallaensis, a newly discovered species of mosasaur, is a significant development in our understanding of the evolution of these ancient marine reptiles and the geological history of late Cretaceous North America. This transitional species, located near Walhalla, North Dakota, bridges the gap between early, primitive mosasaurs and their more advanced counterparts, providing valuable insights into their aquatic adaptations and evolutionary lineage. The discovery sheds light on the complex history of these creatures and their role in the ancient marine ecosystems.
Scientists have recently identified a new species of mosasaur, which were large, carnivorous aquatic lizards that lived in the late Cretaceous period. With “transitional” traits that place it between two well-known mosasaurs, the new species is named after a sea serpent in Norse mythology, Jormungandr, and the small North Dakota city Walhalla near to where the fossil was found. A paper describing Jǫrmungandr walhallaensis was recently published in the Bulletin of the American Museum of Natural History.
Amelia Zietlow, the lead author of the study and a Ph.D. student in comparative biology at the American Museum of Natural History’s Richard Gilder Graduate School, likened the appearance of Jörmungandr walhallaensis to that of a Komodo dragon with flippers and enlarged proportions. a newly discovered
The world of mosasaurs has fascinated researchers for over two centuries, with the term “mosasaur” predating “dinosaur.” Nevertheless, many questions about these creatures persist. These inquiries include how many times mosasaurs independently evolved flippers and transitioned to a fully aquatic lifestyle—researchers speculate it might have occurred at least three times, and possibly even more. Additionally, there is ongoing research to determine whether mosasaurs have closer evolutionary ties to monitor lizards or snakes. Scientists are working diligently to piece together the relationships between the various groups of mosasaurs, and this new study contributes a valuable component to that ongoing puzzle.