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#1 07-11-2018 00:53:05

Date d'inscription: 10-07-2018
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WASHINGTON Cheap Pittsburgh Steelers Jerseys , March 14 (Xinhua) -- Scientists said Monday they have discovered the fossilized remains of a new horse-sized dinosaur that revealed how Tyrannosaurus rex (T. rex) became one of Earth's top predators about 70 to 80 million years ago.

T. rex and its close relatives reached the top of their food chain at the end of the age of dinosaurs, after other groups of large meat-eating dinosaurs had gone extinct about 80 to 90 million years ago.

But little was known about how these fearsome giants evolved from a family of small-bodied dinosaurs known as tyrannosaurs, largely due to a gap in the family's fossil record between 100 and 80 million years ago.

Now, the newly discovered species -- named Timurlengia euotica, which lived about 90 million years ago in today's Uzbekistan, seemed to help solve the mystery.

Timurlengia Cheap Arizona Cardinals Jerseys , named after the 14th-century Central Asian ruler Timurleng, is a tyrannosaur but not the ancestor of the T. rex.

""We had this huge gap in the fossil record, about a 20-million-year gap,"" study author Hans Sues, chair of the Department of Paleobiology at the Smithsonian's National Museum of Natural History,"" told Xinhua.

""And this is an animal from the new tyrannosaurs from 90 million years ago in Central Asia Cheap Atlanta Falcons Jerseys , and it shows that at that point this animal had already evolved the complicated brain and advanced senses the T. Rex had. But it was in a horse sized animal, and so obviously the brain reorganization happened long before these animals became real giants.""

Sues and a team of palaeontologists, led by Steve Brusatte at the University of Edinburgh, studied a collection of tyrannosaur fossils found between 1997 and 2006 in the Kyzylkum Desert, northern Uzbekistan, and discovered the new species.

They found the species' skull was much smaller than that of T. rex Cheap Baltimore Ravens Jerseys , indicating that it did not grow to the same enormous size. However, key features of Timurlengia's skull like large inner ear revealed that it had developed keen senses and cognitive abilities, including the ability to hear low-frequency sounds.

Timurlengia was about the size of a horse, and could weigh up to 250kg. It had long legs and a skull studded with sharp teeth, and was likely a fast runner, researchers said.

The first tyrannosaurs lived around 170 million years ago and were only slightly larger than a human. However Cheap Buffalo Bills Jerseys , by the late Cretaceous Period -- around 100 million years later -- tyrannosaurs had evolved into animals like T. rex and Albertosaurus, which could weigh more than seven tons.

The fact that the new species was still small some 80 million years after tyrannosaurs first appeared indicated that T. rex developed huge body sizes rapidly at the very end of the group's evolutionary history, they said.

""The ancestors of T. rex would have looked a whole lot like Timurlengia, a horse-sized hunter with a big brain and keen hearing that would put us to shame. Only after these ancestral tyrannosaurs evolved their clever brains and sharp senses did they grow into the colossal sizes of T. rex. Tyrannosaurs had to get smart before they got big,"" Brusatte said.

The study, published in the U.S. journal Proceedings of the National Academy of Sciences Cheap Carolina Panthers Jerseys , was funded by the European Commission, National Science Foundation, National Geographic Society and the Russian Scientific Fund Project.

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NEW DELHI, March 19 (Xinhua) - - Two student leaders arrested on charges of sedition from India's prestigious Jawaharlal Nehru University (JNU) were freed Friday on bail, officials said.

Umar Khalid and Anirban Bhattacharya, charged with ""sedition"" for allegedly shouting anti-India slogans along with their union president Kanhaiya Kumar last month at an event organized in the university campus.

The students deny the charges.

Kumar was granted the bail earlier this month.

""JNU students Umar Khalid and Anirban Bhattacharya Cheap Chicago Bears Jerseys , arrested in a sedition case, were today granted interim bail for six months by a Delhi court,"" an official said. ""The Judge noted that the duo should not leave the country without its prior permission.""

Sedition as per Indian law amounts to inciting people to oppose their government. The maximum punishment for sedition in India is life imprisonment. The law dates back to 1870 and was introduced by the British during their time in India.

The arrest of students led to massive protests and clashes across India, besides generating a debate over ""freedom of expression""in India at large.

Reports said anti-India slogans were allegedly shouted during an event on Feb 9 event at JNU to mark the hanging anniversary of 2001 parliament attack convict Mohammed Afzal Guru.

Guru, a Kashmiri was convicted for 2001 Indian parliament attack building and executed in 2013. Many in India and Indian-controlled Kashmir believe Guru was denied fair-trail.

India's former federal minister P Chidambaram also stated there were ""grave doubts"" about the involvement of Guru and that the case was ""perhaps not correctly decided"".

Reports earlier this week said a panel nominated by university to probe its students facing sedition charges has recommended expulsion of five students including Kumar, Khalid and Bhattacharya for violating norms inside the campus.


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