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Paleontologists found a new dinosaur species with tiny T. Rex arms

Published Jul 9th, 2022 7:43PM EDT
tyrannosaur fossil
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Paleontologists have unearthed a new dinosaur species with tiny arms. The species, newly named Meraxes gigas, is a carnivorous species that would have gone extinct at the start of the Late Cretaceous period, roughly 90 to 95 million years ago.

Scientists found a new dinosaur with tiny arms

The paleontologists began digging in the area back in 2012 after Juan Ignacio Canale and his colleague found a sauropod fragment at the field site. The dig took around three months and required some jack hammering, but they later began to exhume new fossils from the area. While processing it all, Canale and his colleagues uncovered the new dinosaur with tiny arms.

But the study of this new dinosaur species is just beginning, Canale notes. There’s a lot that the team still needs to work on. They need to create detailed descriptions of the creature. Canale says they also need to complete a CT scan of the skull to look at its internal spaces.

Additionally, the dinosaur with its tiny arms raises even more questions. While similar to the T-rex and other species with tiny arms, it’s unclear what exactly the arms would have been used for. In the case of Meraxes gigas, the species actually features large bones in its arms. This, the paleontologists say, points towards the arms requiring large muscles, too.

A whole different world

old earth
Earth as it existed 200 million years ago. Image source:

The question of how dinosaurs with tiny arms used those arms has been plaguing scientists for decades. Even as we create new theories or ideas about what they would have been used for, it’s impossible to say for sure. To really prove that, we’d need to go back in time and experience the world they lived in for ourselves.

As I noted above, the Meraxes gigas would have gone extinct at the beginning of the Late Cretaceous. At that time, the location it was found near, El Chocon, Argentina, would have been hot and lush. In fact, it would have shared many similarities with Africa. South America would have been relatively close, too, with the Atlantic Ocean just beginning to form.

Perhaps the environment could have played some part in how the Meraxes gigas and other species of dinosaur with tiny arms evolved. Perhaps evolution called for the heads to be larger to account for more brute strength and cutting power within the beasts’ jaws. What we do know is that these tiny arms may look useless. But, they were anything but that.

All we have to do now is figure out what purpose they served so we can better understand these massive creatures that once ruled the Earth. A paper on the new species was published in Current Biology this month. Previous discoveries from paleontologists have uncovered complete dinosaur embryos, too.

Josh Hawkins has been writing for over a decade, covering science, gaming, and tech culture. He also is a top-rated product reviewer with experience in extensively researched product comparisons, headphones, and gaming devices.

Whenever he isn’t busy writing about tech or gadgets, he can usually be found enjoying a new world in a video game, or tinkering with something on his computer.