New Armless Dinosaur Species Discovered in Argentina

Jay Kakade
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Tiny Armed Dinosaur
Illustration of Green Tiny Armed Dinosaur. (Image Credit: Wikipedia Commons)
 
T(caps)yrannosaurus Rex is a new species of Dinosaurs discovered by palaeontologists of Argentina belonging to Family of armless dinosaurs. This dinosaur is named as Guemesia Ochoai. It is identified via just a single skull fossil and is believed it resembles tiny-armed carnivore species of dinosaur.

Tiny-Armed Carnivore called as Abelisaurids once lived on lands of India, Africa, Europe and South America about 66 million years ago and went extinct.

This skull of G. Ochoai is the only fossil of it found in Argentina. After carbon dating, Skull is believed to be 70 million years old. Skull of G. Ochoai is somewhat different than other Abelisaurids, as braincase is much smaller than others. It is the smallest Abelisaurids brain ever discovered.


G. Ochoai was tiny armed creature not the armless creature. If we believe G. Ochoai resembles same as shown, then this arm would be hanging on chest without any use. Palaeontologists studied fossil and found no mobile elbow joint in arm. This arm did not have claws but only fingers.

But somewhat disabled creature would’ve shown no mercy to its prey. It could easily hunt down much bigger prey than itself. Forelimb made up of strong jaw and sharp teeth easily could break-into prey’s body.

According to press release of United Kingdom’s Natural History Museum, G. Ochoai looked more like Carnotaurus Sastrei. Same as the photo shown below but without horns and small head.
Tiny Armed Dinosaur
Illustration of Tiny Armed Dinosaur. (Image Credit: Fred Wierum/Wikimedia Commons/CC BY 4.0)

According to Palaeontologists, it is very unusual to see dinosaurs like this. This species is very different than other species found in Argentina. This fossil supports the idea of distinct provinces in Cretaceous of South America. Abelisaurids must have been diversly spread across south America. May be this was period when Gondwana Separated and Abelisaurids adapted to new habitat.


But researchers support the idea that these arms must be one of the vestigial organs. May be shortened due to uselessness by creature. Initially Abelisaurids must be from Patagonia, as they resemble similarity with them.

This adaptation may be in response to hot climate. Skull of the dinosaur shows small holes, may be for blood-flow for cooling itself down. But this feature is useless in south.

As compared to other parts of world, Argentina is quite unexplored. That means this is not the only skull of Abelisaurids. There may be more species we will find in coming future.

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