New giant carnivorous dinosaur discovered with tiny arms like T. rex - Phys.org

"The fossil of M. gigas shows never seen before, complete regions of the skeleton, like the arms and legs that helped us to understand some evolutionary trends and the anatomy of Carcharodontosaurids—the group that M. gigas belongs to," says Juan Canale, the project lead at Ernesto Bachmann Paleontological Museum in Neuquén, Argentina.

The authors first set the record straight; T. rex did not get their short arms from M. gigas or vice versa. Not only did M. gigas become extinct almost 20 million years before T. rex became a species, but they are also very far apart on the evolutionary tree. "There is no direct relationship between both," says Canale. Rather, Canale believes that having tiny arms somehow gave the two dinosaurs some kind of survival advantage.

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2022-07-07 15:54:05Z
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