22 juillet 2015

Zhenyuanlong suni


Extrait de la nouvelle:

Researchers have discovered a new predatory dinosaur with a big body, short arms, and multiple layers of large feathers. And it roamed Early Cretaceous China 125 million years ago. 

(...) Zhenyuanlong was between 126 and 165 centimeters (around 5 feet) long, and its proportionally short forelimbs supported large, feathered wings. Their findings, published in Scientific Reports this week, suggests that the diversity of feathered dinosaurs is even higher than we thought.

Being about a-meter-and-a-half long, Zhenyuanlong is one of the largest dinosaurs that’s been discovered with such a well-preserved set of bird-like wings and dense feathers on its tail. The feathers found on larger, previously described dinosaurs were simple filaments that resembled hair. The complex feathers of this new species are comprised of fine branches that stem from a central shaft.

Most Liaoning dromaeosaurids were small – between the size of a cat and a medium-sized dog – and they had long forelimbs with broad wings covered in feathers. The one exception is the two-meter-long (6.5-foot-long) Tianyuraptor, who also had comparatively shorter forelimbs but no preserved feathers. 

Despite these bird-like wings, the researchers don’t think Zhenyuanlong could fly, at least not using the same muscle-driven flight we see in birds today. The purpose these wings served remains to be revealed. 

(...) "This new dinosaur is one of the closest cousins of Velociraptor, but it looks just like a bird," Brusatte says in a statement. "It’s a dinosaur with huge wings made up of quill pen feathers, just like an eagle or a vulture. The movies have it wrong – this is what Velociraptor would have looked like too."




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