New Mexico
New Species of Giant Tyrannosaur Discovered in New Mexico | Sci.News
The discovery of Tyrannosaurus mcraeensis, a sister species of the famous Tyrannosaurus rex, suggests that tyrannosaurid dinosaurs originated on Laramidia, an island continent that existed between 100 and 66 million years ago and stretched from modern-day Alaska to Mexico.
Life reconstruction of Tyrannosaurus mcraeen. Image credit: Sergey Krasovskiy.
“Tyrannosaurid dinosaurs were the dominant predators in North America and Asia during the Late Cretaceous epoch,” said Dr. Sebastian Dalman from the New Mexico Museum of Natural History and Science and his colleagues.
“Evolving from small-bodied ancestors in the mid-Cretaceous, they became apex predators in the latest Cretaceous, and finally saw the appearance of T. rex.”
“T. rex, characterized by a robust skeleton and powerful, bone-crushing jaws, was the dominant carnivore in the Late Maastrichtian of western North America.”
“Growing to 12 m long and 10 tons in weight, T. rex was the largest terrestrial predator of its time, and perhaps of all time.”
“Where and when Tyrannosaurini (T. rex and kin) originated remains unclear. Competing hypotheses place their origins in Asia, or western North America (Laramidia).”
The newly-identified species, Tyrannosaurus mcraeen, lived in what is now the United States between 71 and 73 million years ago, or between 5 and 7 million years before T. rex.
The dinosaur’s fossilized partial skull was found in the Hall Lake Formation of New Mexico.
Although the specimen was initially assigned to T. rex and was comparable in size to those of T. rex, the paleontologists propose that it belongs to a new species due to the presence of multiple subtle differences in the shape of, and joins between, the skull bones of the specimen and T. rex.
An analysis of the relationships between Tyrannosaurus mcraeen and other theropod dinosaur species indicates that Tyrannosaurus mcraeen may have been a sister species to T. rex, making it the closest known relative of T. rex.
The authors suggest that Tyrannosaurini may have originated in southern Laramidia, an island continent that existed between 100 and 66 million years ago and stretched from modern-day Alaska to Mexico.
Additionally, they propose that Tyrannosaurini may have evolved a giant body size by approximately 72 million years ago, alongside other giant dinosaurs from southern Laramidia such as ceratopsians, hadrosaurs, and titanosaurs.
They speculate that the evolution of giant tyrannosaurins may have been driven by the giant body sizes of herbivores that they preyed on in southern Laramidia.
“Evolution of giant tyrannosaurs in southern North America, alongside giant ceratopsians, hadrosaurs, and titanosaurs suggests large-bodied dinosaurs evolved at low latitudes in North America,” they said.
The study was published in the journal Scientific Reports.
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S.G. Dalman et al. 2023. A giant tyrannosaur from the Campanian–Maastrichtian of southern North America and the evolution of tyrannosaurid gigantism. Sci Rep 13, 22124; doi: 10.1038/s41598-023-47011-0
SANTA FE, N.M. — Former New Mexico Public Regulation Commissioner Jim Ellison is running for governor as a Republican, he announced on social media Tuesday.
Ellison is running on affordability, opportunity and trust in government as the key points of his campaign. His experience includes serving on the NMPRC in 2023 and 2024.
“New Mexico deserves leadership that listens, acts, and delivers results. Our state has enormous potential, but too often that potential is held back by policies that don’t serve everyday New Mexicans,” he said on his website. “I’m running to bring practical solutions, honest accountability, and a renewed focus on the public interest.”
A Georgia native, Ellison has lived in New Mexico for 20 years and currently lives in the Albuquerque area with his wife and two children.
Ellison is aiming to get 5,000 signatures by Feb. 2, to appear on the primary ballot with at least three other Republicans who have announced their candidacy.
Ultra Health CEO Duke Rodriguez announced his campaign in December and recently confirmed to KOB 4 that he received enough signatures to appear on the primary ballot. Rio Rancho Mayor Gregg Hull and New Mexico State Sen. Steve Lanier are also running.
Three Democrats are running – Bernalillo County District Attorney Sam Bregman, Former Interior Secretary Deb Haaland and Former Las Cruces Mayor Ken Miyagishima.
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