Earth Sciences

A giant tyrannosaur from the Campanian-Maastrichtian of southern North America and the evolution of tyrannosaurid gigantism

S. G. Dalman, M. A. Loewen, et al.

Discover the groundbreaking research by a team led by Sebastian G Dalman, revealing a new species of tyrannosaur, *Tyrannosaurus mcraeensis*, which predates *T. rex* by approximately 6-7 million years, while showcasing its remarkable size and evolutionary ties in southern Laramidia.

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Index

Abstract

This paper describes a new tyrannosaurin species, *Tyrannosaurus mcraeensis*, from the Campanian-Maastrichtian Hall Lake Formation of New Mexico. *T. mcraeensis*, based on a previously misidentified fossil, predates *T. rex* by ~6-7 million years yet was comparable in size. Phylogenetic analysis places *T. mcraeensis* as a sister taxon to *T. rex*, suggesting Tyrannosaurini originated in southern Laramidia. The coexistence of giant tyrannosaurs, ceratopsians, hadrosaurs, and titanosaurs in southern Laramidia indicates a pattern of large-bodied dinosaur evolution at low latitudes in North America.

Publisher

Scientific Reports

Published On

Jan 23, 2024

Authors

Sebastian G Dalman, Mark A Loewen, R Alexander Pyron, Steven E Jasinski, D Edward Malinzak, Spencer G Lucas, Anthony R Fiorillo, Philip J Currie, Nicholas R Longrich

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