The New Mexico Department of Cultural Affairs has revealed that researchers from the New Mexico Museum of Natural History & Science (NMMNHS) have discovered the earliest known relative of Tyrannosaurus rex in North America. This newly unearthed dinosaur is more primitive than T. rex, yet it shares a similar impressive size.
According to the research based on a skull found in western New Mexico, this discovery suggests that the presence of Tyrannosaurus species in North America dates back millions of years earlier than previously thought. The team, in collaboration with global researchers, identified subtle differences that establish the uniqueness of this New Mexico tyrannosaur. Named Tyrannosaurus mcraeensis, this dinosaur predates its famous relative and implies a separate evolutionary path. The discovery also suggests that larger and more advanced tyrannosaurs evolved in the southern U.S., leading to unknown factors causing their northern migration. This challenges typical size patterns seen in modern mammals, according to a press release by the New Mexico Department of Cultural Affairs.
"New Mexicans have always known our state is special, now we know that New Mexico has been a special place for tens of millions of years," said Dr. Anthony Fiorillo, Executive Director of NMMNHS and co-author of the study.
Longrich added, "The differences are subtle, but that’s typically the case in closely related species. Evolution slowly causes mutations to build up over millions of years, causing species to look subtly different over time."
As stated on its mission webpage, NMMNHS is dedicated to preserving and interpreting the state's natural and scientific heritage through collections, research exhibits and programs. Its aim is to instill a lasting appreciation, understanding and stewardship of science and the natural world among the public.
