Wednesday, September 19 2018

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200-million year old Pterosaur ’built for flying’

Update: August, 14/2018 - 10:59
Scientists discovered a new species of giant pterosaur, the first vertebrates to fly under their own power. Photo gulfnews.com
Viet Nam News

PARIS — Scientists on Monday unveiled a previously unknown species of giant pterosaur, the first creatures with a backbone to fly under their own power.

Neither dino nor bird, pterosaurs -- more commonly known as pterodactyls -- emerged during the late Triassic period more than 200 million years ago and lorded over primeval skies until a massive space rock slammed into Earth, wiping out land-dwelling dinosaurs and most other forms of life more than 65 billion years ago .

The newly discovered member of the family, identified through remains found in northeastern Utah, had a wing-span of 1.5m and 112 teeth, including fang-like spikes sticking out near the snout. A jutting lower jaw suggests a pelican-like pouch, perhaps to scoop up fish and unsuspecting small reptiles.

"They are delicately framed animals that are built for flying," said Brooks Britt, a paleontologist at Brigham Young University in Utah and lead author of a study in Nature Ecology & Evolution. Caelestiventus hanseni -- roughly, "heavenly wind" -- is probably the most complete skeletal remains of a pterosaurs ever found.

"Most pterosaurs bones look like road-kill," Britt said, noting that there are only 30-odd specimens in the entire world from the Triassic period. By contrast, the new specimen left behind dozens of intact bones and teeth, along with an entire brain casing.

The remains are still encased in sandstone, but scientists generated accurate 3-D images and models of each fossil using CAT scan technology. The site where C. hanseni was unearthed, known to fossil hunters as Saints & Sinners, reveals a dramatic story of survival and local extinction in the face of climate change, the researchers said.

The rocks it was found in were part of an oasis in a two-million square km desert covered with giant sand dunes."During droughts, large numbers of animals -- including pterosaurs, predatory dinosaurs and crocodylomorphs -- were drawn to the pond in the middle of the oasis, where they died as water dried up," said Britt.

The result was a treasure trove of more than 18,000 bones from dozens of water-starved animals. C. hanseni is not the biggest pterosaur ever found, but was likely the largest of its era, especially for a desert environment. It also predates other desert-dwelling specimens by about 65 million years.

The other pterosaurs from the same period found so far came from coastal areas in what is now Europe and Greenland. That the high-flying creatures were spread across much of the globe may have helped them survive -- some 201 million years ago -- the end-of-Triassic mass extinction, which wiped out half of the species on land and in the sea. — AFP

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