News / Science & Technology

Ancient Sea Lizard Had Shark-like Fin

The mosasaur Prognathodon was a lizard-like creature with a shark-like fin.
The mosasaur Prognathodon was a lizard-like creature with a shark-like fin.

Related Articles

New Horned Dinosaur Unearthed

Nasutoceratops, found in southern Utah, lived 76 million years ago in the late Cretaceous period

Dinosaur Teeth Fell Out Often, Regrew Quickly

For some, as many as 5 teeth were waiting in each tooth socket

Scientists Excavate Full Dinosaur Tail in Mexico

The well-preserved five-meter-long tail was found west of Monterrey, Mexico, and is believed to be 72 million years old
VOA News
It was a lizard with a shark-like fin. That’s what Swedish researchers have discovered about the fearsome mosasaur Prognathodon, which lived in the seas of the Cretaceous Period about 70 million years ago.

The discovery was based on a fossil found in Jordan in 2008. Researcher Johan Lindgren, of Lund University in Sweden, travelled to Jordan in 2011 and discovered that imprints of soft tissue had been preserved around the creature’s tail fin, which ultimately led to the conclusion about its shape. The fossil proved to be the first one of its kind that revealed the tail fin contour in its entirety. But unlike a shark fin, the mosasaur’s fin faced downward

“After trying to reconstruct the tail fin for years, with only the skeleton to go by, I was suddenly standing in front of the definitive answer”, said Johan Lindgren, who lead the international group of Jordanian and American researchers involved in the discovery. “It was a fantastic feeling of euphoria.”

The mosasaur, which could grow up to 17 meters in length, was previously thought to have a long, rectilinear body and a straight, elongated tail. Instead, it has a streamlined, fish-like body with a fluked tail. This is more in line with other big marine creatures, such as the extinct ichthyosaurs (250-94 million years ago) and today’s sharks and whales.

“These characteristics demonstrate in an outstanding way how organisms living in similar environments develop similar features, in a process known as convergent evolution”, said Lindgren.

He points out that the mosasaur’s evolutionary history – not just this discovery but in general – is one of the best examples of large-scale evolution and how animals change appearance in order to adapt to a new environment. In this case, mosasaurs adapted to a marine life following life on land.

You May Like

Photogallery Pistorius Sentenced, Taken to Prison

Pistorius, convicted of culpable homicide in shooting death of girlfriend Reeva Steenkamp, will likely serve about 10 months of five-year sentence, before completing it under house arrest More

UN to Aid Central Africa in Polio Vaccinations

Synchronized vaccinations will be conducted after Cameroon reports a fifth case of the wild polio virus in its territory More

WHO: Ebola Vaccine May Be in Use by Jan.

WHO assistant director Dr. Marie Paule Kieny says clinical trials of Ebola vaccines are underway or planned in Europe, US and Africa More

This forum has been closed.
Comment Sorting
Comments
     
by: Steve from: Alabama
September 14, 2013 1:22 AM
The mosasaur was discovered by H. Kaddumi in 2008, a Jordanian paleontologist, get that right and stop copying each other's mistakes.

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
After Decades of Pressure, Luxembourg Drops Bank Secrecy Rulesi
X
October 21, 2014 12:20 AM
European Union finance ministers have reached a breakthrough agreement that will make it more difficult for tax cheats to hide their money. The new legislation, which had been blocked for years by countries with a reputation as tax havens, was approved last week after Luxembourg and Austria agreed to lift their vetoes. But as Mil Arcega reports, it doesn’t mean tax cheats have run out of places to keep their money hidden.
Video

Video After Decades of Pressure, Luxembourg Drops Bank Secrecy Rules

European Union finance ministers have reached a breakthrough agreement that will make it more difficult for tax cheats to hide their money. The new legislation, which had been blocked for years by countries with a reputation as tax havens, was approved last week after Luxembourg and Austria agreed to lift their vetoes. But as Mil Arcega reports, it doesn’t mean tax cheats have run out of places to keep their money hidden.
Video

Video Kobani Refugees Welcome, Turkey Criticizes, US Airdrop

Residents of Kobani in northern Syria have welcomed the airdrop of weapons, ammunition and medicine to Kurdish militia who are resisting the seizure of their city by Islamic State militants. The Turkish government, however, has criticized the operation. VOA’s Scott Bobb reports from southeastern Turkey, across the border from Kobani.
Video

Video China Political Meeting Seeks to Improve Rule of Law

China’s communist leaders will host a top level political meeting this week, called the Fourth Plenum, and for the first time in the party’s history, rule of law will be a key item on the agenda. Analysts and Chinese media reports say the meetings could see the approval of long-awaited measures aimed at giving courts more independence and include steps to enhance an already aggressive and high-reaching anti-corruption drive. VOA’s Bill Ide has more from Beijing.
Video

Video US ‘Death Cafes’ Put Focus on the Finale

In contemporary America, death usually is a topic to be avoided. But the growing “death café” movement encourages people to discuss their fears and desires about their final moments. VOA’s Jerome Socolovsky reports.
Video

Video Ebola Orphanage Opens in Sierra Leone

Sierra Leone's first Ebola orphanage has opened in the Kailahun district. Hundreds of children orphaned since the beginning of the Ebola outbreak face stigma and rejection with nobody to care for them. Adam Bailes reports for VOA about a new interim care center that's aimed at helping the growing number of children affected by Ebola.
Video

Video Young Nairobi Tech Innovator on 'Track' in Security Business

A 24-year-old technology innovator in Nairobi has invented a tracking device that monitors and secures cars. He has also come up with what he claims is the most robust audio-visual surveillance system yet. As Lenny Ruvaga reports from the Kenyan capital, his innovations are offering alternative security solutions.
Video

Video Latinas Converting to Islam for Identity, Structure

Latinos are one of the fastest growing groups in the Muslim religion. According to the Pew Research Center, about 6 percent of American Muslims are Latino. And a little more than half of new converts are female. VOA’s Carolyn Presutti travelled to Miami, Florida -- where two out of every three residents is Hispanic -- to learn more.
Video

Video Exclusive: American Joins Kurds' Anti-IS Fight

The United States and other Western nations have expressed alarm about their citizens joining Islamic State forces in Syria and Iraq. In a rare counterpoint to the phenomenon, an American has taken up arms with the militants' Syrian Kurdish opponents. Elizabeth Arrott has more in this exclusive profile by VOA Kurdish reporter Zana Omer in Ras al Ayn, Syria.
Video

Video South Korea Confronts Violence Within Military Ranks

Every able-bodied South Korean male between 18 and 35 must serve for 21 to 36 months in the country’s armed forces, depending upon the specific branch. For many, service is a rite of passage to manhood. But there are growing concerns that bullying and violence come along with the tradition. Reporter Jason Strother has more from Seoul.
Video

Video North Carolina Emerges as Key Election Battleground

U.S. congressional midterm elections will be held on November 4th and most political analysts give Republicans an excellent chance to win a majority in the U.S. Senate, which Democrats now control. So what are the issues driving voters in this congressional election year? VOA National Correspondent Jim Malone traveled to North Carolina, one of the most politically competitive states in the country, to find out.
Video

Video Comanche People Maintain Pride in Their Heritage

The Comanche (Indian nation) once were called the “Lords of the Plains,” with an empire that included half the land area of current day Texas, large parts of Oklahoma, New Mexico, Kansas and Colorado.The fierceness and battle prowess of these warriors on horseback delayed the settlement of most of West Texas for four decades. VOA’s Greg Flakus reports from Lawton, Oklahoma, that while their warrior days are over, the 15,000 members of the Comanche Nation remain a proud people.
Video

Video Turkey Campus Attacks Raise Islamic Radicalization Fears

Concerns are growing in Turkey of Islamic radicalization at some universities, after clashes between supporters of the jihadist group Islamic State (IS) or ISIS, and those opposed to the extremists. Pro-jihadist literature is on sale openly on the streets of Istanbul. Critics accuse the government of turning a blind eye to radicalism at home, while Kurds accuse the president of supporting IS - a charge strongly denied. Henry Ridgwell reports from London.

All About America

AppleAndroid