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

Brutality Eroding IS Financial Support

Director of National Intelligence James Clapper says IS's penchant for publicizing beheadings, other brutal forms of punishment hurts group’s bottom line More

Studies: Climate Change a Factor in Disasters in Syria, California

The studies point to the possibility of clear and present dangers from a threat often considered to be far in the future More

Video Afghan Refugees Complain of Harassment in Pakistan

Afghan officials and human rights organizations assert that Pakistani authorities are using deadly attack at school in Peshawar as pretext to push out Afghan refugees 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.
Kerry Seeks Assurances of Russian Non-Interference in Ukrainei
X
March 03, 2015 3:11 AM
U.S. Secretary of State John Kerry has told his Russian counterpart, Sergei Lavrov, that his country could face further consequences to what he called its “already strained economy” if Moscow does not fully comply with a cease-fire in Ukraine. The two met, on Monday, on the sidelines of a U.N. Human Rights Council meeting in Geneva, where Kerry outlined human rights violations in Russian-annexed Crimea and eastern Ukraine. VOA State Department correspondent Pam Dockins reports from Geneva.
Video

Video Kerry Seeks Assurances of Russian Non-Interference in Ukraine

U.S. Secretary of State John Kerry has told his Russian counterpart, Sergei Lavrov, that his country could face further consequences to what he called its “already strained economy” if Moscow does not fully comply with a cease-fire in Ukraine. The two met, on Monday, on the sidelines of a U.N. Human Rights Council meeting in Geneva, where Kerry outlined human rights violations in Russian-annexed Crimea and eastern Ukraine. VOA State Department correspondent Pam Dockins reports from Geneva.
Video

Video Smartphones May Help in Diagnosing HIV

Diagnosing infections such as HIV requires expensive clinical tests, making the procedure too costly for many poor patients or those living in remote areas. But a new technology called lab-on-a-chip may make the tests more accessible to many. VOA’s George Putic reports.
Video

Video Afghan Refugees Complain of Harassment in Pakistan

Afghan officials have expressed concern over reports of a crackdown on Afghan refugees in Pakistan following the Peshawar school attack in December. Reports of mass arrests and police harassment coupled with fear of an uncertain future are making life difficult for a population that fled its homeland to escape war. VOA’s Ayesha Tanzeem reports from Islamabad.
Video

Video Ukrainian Volunteers Prepare to Defend Mariupol

Despite the ongoing ceasefire in Ukraine, soldiers in the city of Mariupol fear that pro-Russian separatists may be getting ready to attack. The separatists must take or encircle the city if they wish to gain land access to Crimea, which was annexed by Russia early last year. But Ukrainian forces, many of them volunteers, say they are determined to defend it. Patrick Wells reports from Mariupol.
Video

Video Moscow Restaurants Suffer in Bad Economy, Look for Opportunity

As low oil prices and Western sanctions force Russia's economy into recession, thousands of Moscow restaurants are expected to close their doors. Restaurant owners face rents tied to foreign currency, while rising food prices mean Russians are spending less when they dine out. One entrepreneur in Moscow has started a dinner kit delivery service for those who want to cook at home to save money but not skimp on quality. VOA's Daniel Schearf reports.
Video

Video US, Cuba Report Progress in Latest Talks to Restore Ties

The United States and Cuba say they have made progress in the second round of talks on restoring diplomatic relations more than 50 years after breaking off ties. Delegations from both sides met in Washington on Friday to work on opening embassies in Havana and Washington and iron out key obstacles to historic change. VOA’s Mary Alice Salinas reports from the State Department.
Video

Video Presidential Hopefuls Battle for Conservative Hearts and Minds

One after another, presumptive Republican presidential contenders auditioned for conservative support this week at the Conservative Political Action Conference held outside Washington. The rhetoric was tough as a large field of potential candidates tried to woo conservative support with red-meat attacks on President Barack Obama and Democrats in Congress. VOA Political Columnist Jim Malone takes a look.
Video

Video NYC's Restaurant Week: An Economic Boom in Fine Dining

New Yorkers take pride in setting world trends — in fashion, the arts and fine dining. The city’s famous biannual Restaurant Week plays a significant role in a booming tourism industry that sustains 359,000 jobs and generates $61 billion in yearly revenue. VOA's Ramon Taylor reports.
Video

Video Brookhaven at Cutting Edge of US Energy Research

Issues like the Keystone XL pipeline, fracking and instability in the Middle East are driving debate in the U.S. about making America energy independent. Recently, the American Energy Innovation Council urged Congress and the White House to make expanded energy research a priority. One beneficiary of increased energy spending would be the Brookhaven National Lab, where clean, renewable, efficient energy is the goal. VOA's Bernard Shusman reports.
Video

Video Southern US Cities Preserve Civil Rights Heritage to Boost Tourism

There has been a surge of interest in the American civil rights movement of the 1950s and '60s, thanks in part to the Hollywood motion picture "Selma." Five decades later, communities in the South are embracing the dark chapters of their past with hopes of luring tourism dollars. VOA's Chris Simkins reports.
Video

Video Deep Under Antarctic Ice Sheet, Life!

With the end of summer in the Southern hemisphere, the Antarctic research season is over. Scientists from Northern Illinois University are back in their laboratory after a 3-month expedition on the Ross Ice Shelf, the world’s largest floating ice sheet. As VOA’s Rosanne Skirble reports, they hope to find clues to explain the dynamics of the rapidly melting ice and its impact on sea level rise.
Video

Video Lao Dam Project Runs Into Opposition

A Lao dam project on a section of the Mekong River is drawing opposition from local fishermen, international environmental groups and neighboring countries. VOA's Say Mony visited the region to investigate the concerns. Colin Lovett narrates.

All About America

Circumventing Censorship

An Internet Primer for Healthy Web Habits

As surveillance and censoring technologies advance, so, too, do new tools for your computer or mobile device that help protect your privacy and break through Internet censorship.
More