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This 74-Million-Year-Old Dinosaur Bone May Have Belonged to a Surprisingly Large Ancestor of Tyrannosaurus Rex

Summary by Smithsonian Mag
The massive reptile may have weighed more than 4.5 tons and been 35 feet long—much bigger than its related peers at the time

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The fossil found in New Mexico is about 74 million years old, probably belonged to an ancestor of T. rex and was insignificantly smaller than the largest Tyrannosaurier

·Vienna, Austria
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A new ancestor or close relative of the T-rex has been discovered in North America. It appears to be surprisingly close in size to its famous younger relative.

·Stockholm, Sweden
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An approximately one metre long shin bone of a dinosaur was found in the USA. What does the fossil reveal about a relative of the legendary T-Rex?A shin bone discovered in the USA could belong to a tyrannosaurier who had a common ancestor with Tyrannosaurus rex. The bone fossil is 96 centimeters long and has a diameter of 12.8 centimeters. The length corresponds to 84 percent of the shin bone of Sue, the largest known Tyrannosaurus rex. The now …

Discovered in the 1970s, this fossil has only just been reanalyzed by paleontologists. Its exceptional size reveals the existence of a colossal carnivore that already dominated North American Cretaceous ecosystems.

We thought we knew everything about the Tyrannosaurus rex, the ultimate predator that ruled at the very end of the dinosaur era. But only one bone, a massive tibia discovered in the 1980s and remained long underestimated in New Mexico's collections, has just pulverized the official chronology. This "big brother" of the king, older [...]

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Deník.cz broke the news in on Sunday, March 15, 2026.
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