New Mosasaur Species Discovered in North Dakota Offers Insights into Evolution of Prehistoric Marine Lizards

Jörmungandr walhallaensis, a newly identified species named after a Norse sea serpent, offers a deeper understanding of the evolution and lineage of mosasaurs; the 24-foot-long creature presents a mix of features found in two other known mosasaur species, marking it as a key transition in the mosasaur evolutionary timeline.