News / Science & Technology

Evidence of New Meat-eating Dinosaur Discovered in Utah

Artist rendering of the Siats meekerorum in its habitat. (North Carolina State University)
Artist rendering of the Siats meekerorum in its habitat. (North Carolina State University)
Rick Pantaleo
U.S. paleontologists say they’ve discovered a new species of meat-eating dinosaur that lived about 98 million years ago and dominated the early ancestors of fearsome predators such as the Tyrannosaurus Rex.

The newly discovered species, named Siats meekerorum after a cannibalistic man-eating monster from Native American tribal legend, is one of the three largest carnivorous dinosaurs ever found in North America. The largest of that group was the T-Rex, which came along about 30 million years after the Siats and weighed more than twice as much.

The North Carolina and Illinois researchers behind the discovery say this new species is a member of a group of gigantic meat-eaters called carcharodontosaurs, which include some of the largest predatory dinosaurs ever discovered.

Writing in Nature Communications, the researchers say they found the partial skeleton of the new predator in Utah’s Cedar Mountain Formation back in 2008.

Artist recreation of the giant predator dinosaur known as Siats meekerorum. (The Field Museum)Artist recreation of the giant predator dinosaur known as Siats meekerorum. (The Field Museum)
x
Artist recreation of the giant predator dinosaur known as Siats meekerorum. (The Field Museum)
Artist recreation of the giant predator dinosaur known as Siats meekerorum. (The Field Museum)
“It’s been 63 years since a predator of this size has been named from North America,” said Lindsay Zanno, a North Carolina State University paleontologist and lead author of the paper. “You can’t imagine how thrilled we were to see the bones of this behemoth poking out of the hillside.”

The remains found by Zanno and research partner Peter Makovicky, from Chicago’s Field Museum of Natural History, were of a youngster that was more than 9 meters long and weighed about 3,630 kg.  They theorize that an adult of the species may have been about 12 meters long and weighed about 6,200 kg.

The Siats dinosaur lived during the Late Cretaceous period in lush surroundings with large amounts of vegetation and water, which supported a variety of animal life such as plant-eating dinosaurs, turtles, crocodiles, and giant lungfish. Until this discovery, scientists didn’t know what species was the top carnivore in North America at that time.

“Carcharodontosaurs reigned for much longer in North America than we expected,” said Zanno.  

The discovery has filled a 30-million-year gap in the fossil record, when the role of the top predator went from Siats and other carcharodontosaurs in the early Cretaceous period, to species of tyrannosaurs in the late Cretaceous period.

That gap in the fossil record had paleontologists unsure of when tyrannosaurs took over the title of top predator and whether it was because they overpowered the carcharodontosaurs or simply took over after the carcharodontosaurs became extinct.   

The  scientists said their research has made it clear that the large size of the Siats meekerorum would have kept the smaller species of tyrannosaurs from besting them.

“The huge size difference certainly suggests that tyrannosaurs were held in check by carcharodontosaurs, and only evolved into enormous apex predators after the carcharodontosaurs disappeared,” says Makovicky.

“Contemporary tyrannosaurs would have been no more than a nuisance to Siats, like jackals at a lion kill. It wasn’t until carcharodontosaurs bowed out that the stage could be set for the evolution of T. rex,” said Zanno.

You May Like

Video Protests Continue in Ferguson, Spread to Other US Cities

Missouri officials say deployment of more than 2,000 National Guard soldiers helps curb second night of rampant arson and looting in Midwestern town More

Video Ebola, Crackdown on Illegals Hit Business in Guangzhou

Chinese city has largest community of Africans in Asia More

Video Legendary Lebanese Actress, Singer Sabah Dies at 87

Music and film diva, affectionately called 'Sabbouha' by millions of her fans, performed at Carnegie Hall in New York, Royal Albert Hall in London, Olympia in Paris, Sydney Opera House in Sydney More

This forum has been closed.
Comment Sorting
Comments
     
by: Vladimir from: Russia
November 27, 2013 2:29 PM
Can it be possible that birds like seagull coud be flying in the background of the picture: Siats meekerorum in its habitat. (North Carolina State University).

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Aung San Suu Kyi: Myanmar Opposition to Keep Pushing for Constitutional Changei
X
November 24, 2014 10:09 PM
Myanmar opposition leader Aung San Suu Kyi says she and her supporters will continue pushing to amend a constitutional clause that bars her from running for president next year. VOA's Than Lwin Htun reports from the capital Naypyitaw in this report narrated by Colin Lovett.
Video

Video Aung San Suu Kyi: Myanmar Opposition to Keep Pushing for Constitutional Change

Myanmar opposition leader Aung San Suu Kyi says she and her supporters will continue pushing to amend a constitutional clause that bars her from running for president next year. VOA's Than Lwin Htun reports from the capital Naypyitaw in this report narrated by Colin Lovett.
Video

Video Mali Attempts to Shut Down Ebola Transmission Chain

Senegal and Nigeria were able to stop small Ebola outbreaks by closely monitoring those who had contact with the sick person and quickly isolating anyone with symptoms. Mali is now scrambling to do the same. VOA’s Anne Look reports from Mali on what the country is doing to shut down the chain of transmission.
Video

Video Ukraine Marks Anniversary of Deadly 1930s Famine

During a commemoration for millions who died of starvation in Ukraine in the early 1930s, President Petro Poroshenko lashed out at Soviet-era totalitarianism for causing the deaths and accused today’s Russian-backed rebels in the east of using similar tactics. VOA’s Daniel Shearf reports from Kyiv.
Video

Video Hong Kong Protests at a Crossroads

New public opinion polls in Hong Kong indicate declining support for pro-democracy demonstrations after weeks of street protests. VOA’s Bill Ide in Guangzhou and Pros Laput in Hong Kong spoke with protesters and observers about whether demonstrators have been too aggressive in pushing for change.
Video

Video US Immigration Relief Imminent for Mixed-Status Families

Tens of thousands of undocumented immigrants in the Washington, D.C., area may benefit from a controversial presidential order announced this week. It's not a path to citizenship, as some activists hoped. But it will allow more immigrants who arrived as children or who have citizen children, to avoid deportation and work legally. VOA's Victoria Macchi talks with one young man who benefited from an earlier presidential order, and whose parents may now benefit after years of living in fear.
Video

Video New Skateboard Defies Gravity

A futuristic dream only a couple of decades ago, the hoverboard – a skateboard that floats above the ground - has finally been made possible. While still not ready for mass production, it promises to become a cool mode of transport... at least over some surfaces. VOA’s George Putic reports.
Video

Video Falling Gas Prices Impact US Oil Extraction

With the price of oil now less than $80 a barrel, motorists throughout the United States are benefiting from gas prices below $3 a gallon. But as VOA’s Kane Farabaugh reports, the decreasing price of petroleum has a downside for the hydraulic fracturing industry in the United States.
Video

Video Tensions Build on Korean Peninsula Amid Military Drills

It has been another tense week on the Korean peninsula as Pyongyang threatened to again test nuclear weapons while the U.S. and South Korean forces held joint military exercises in a show of force. VOA’s Brian Padden reports from the Kunsan Air Base in South Korea.
Video

Video Mama Sarah Obama Honored at UN Women’s Entrepreneurship Day

President Barack Obama's step-grandmother is in the United States to raise money to build a $12 million school and hospital center in Kogelo, Kenya, the birthplace of the president's father, Barack Obama, Sr. She was honored for her decades of work to aid poor Kenyans at a Women's Entrepreneurship Day at the United Nations.
Video

Video Ebola Economic Toll Stirs W. Africa Food Security Concerns

The World Bank said Wednesday that it expects the economic impact of the Ebola outbreak on the sub-Saharan economy to cost somewhere betweenf $3 billion to $4 billion - well below a previously-outlined worst-case scenario of $32 billion. Some economists, however, paint a gloomier picture - warning that the disruption to regional markets and trading is considerable. Henry Ridgwell reports from London.
Video

Video Chaos, Abuse Defy Solution in Libya

The political and security crisis in Libya is deepening, with competing governments and, according to Amnesty International, widespread human rights violations committed with impunity. VOA’s Al Pessin reports from London.
Video

Video US Hosts Record 866,000 Foreign Students

Close to 900,000 international students are studying at American universities and colleges, more than ever before. About half of them come from Asia, mostly China. The United States hosts more foreign students than any other country in the world, and its foreign student population is steadily growing. Zlatica Hoke reports.

All About America

AppleAndroid