Fossilized Predator Bones Unveil a New Species in the Dinosaur Graveyard of Hell Creek
Recent findings in the renowned Cretaceous dinosaur graveyard of Hell Creek have revealed a surprising twist in the tale of prehistoric predators. Contrary to previous assumptions, the fossilized bones discovered do not belong to a baby Tyrannosaurus rex but to a distinct and diminutive tyrannosaurid predator known as Nanotyrannus lancensis.
Analysis of the almost complete skeleton, famously part of the Dueling Dinosaurs fossil, has shed light on the true identity of this predator. At a mere fraction of the size of its larger relatives, Nanotyrannus lancensis, weighing in at about the same as a polar bear, was designed for agility and speed rather than brute force.
The debate surrounding the Nanotyrannus genus has raged on for decades, with some experts suggesting that these specimens were actually juvenile T. rex individuals. However, the comprehensive study led by paleontologist Lindsay Zanno from North Carolina State University has definitively put this controversy to rest.
Zanno states, “This fossil not only resolves the debate but also revolutionizes decades of T. rex research.” The detailed anatomical survey conducted by Zanno and her colleague James Napoli meticulously examined growth rings, spinal fusion data, and developmental anatomy to determine the maturity of the specimen at the time of its demise.
The analysis revealed that the individual was fully grown, weighing around 680 kilograms. In comparison, a mature T. rex could reach weights of up to 8,000 kilograms or more. Furthermore, Nanotyrannus lancensis displayed distinct features that set it apart from the typical T. rex morphology.
Napoli adds, “For Nanotyrannus to be considered a juvenile T. rex, it would defy all known principles of vertebrate growth. It’s not just improbable â it’s implausible.”
By studying over 200 tyrannosaur fossils, the researchers were able to identify another specimen closely resembling N. lancensis. They also discovered a separate species, Nanotyrannus lethaeus, which bridges the gap between Nanotyrannus and T. rex.
This groundbreaking discovery not only clarifies the classification of Nanotyrannus but also offers a more accurate understanding of juvenile T. rex development. It enriches our knowledge of the ancient ecosystems in which these creatures roamed.
“The revelation provides a more dynamic perspective on the final days of the dinosaurs,” Zanno explains. “While T. rex was a formidable predator with immense size and strength, it was not the sole ruler of its domain. Racing alongside was Nanotyrannus â a sleeker, faster, and more agile hunter.”
The research findings have been published in Nature.
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