Fossilized Teeth Help Determine Biggest Shark Ever

A great white shark in Southern Australia in 2015.NiCK / Getty Images file
A great white shark in Southern Australia in 2015.NiCK / Getty Images file
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Fossilized Teeth Help Determine Biggest Shark Ever

A great white shark in Southern Australia in 2015.NiCK / Getty Images file
A great white shark in Southern Australia in 2015.NiCK / Getty Images file

US researchers have found that Megalodon was the most massive shark that ever lived, even among living sharks.

Most Megalodon fossils date to around 15 million years ago, however, little is known about its anatomy; since shark skeletons are made of cartilage rather than bone, they are extremely scarce in the fossil record, save for their plentiful fossilized teeth, which were used by a research group led study author Kenshu Shimada, a professor of paleobiology at DePaul University in Chicago, to estimate the size of the animal.

In the study published Monday in the journal Historical Biology, Shimada and his colleagues generated a new tool for calculating body length: an equation representing the actual quantitative relationship between body length and tooth size in lamniform. They based it on the teeth and known body lengths from 32 specimens of living, predatory lamniform sharks, representing all shark species including Megalodon.

The researchers found that many extinct lamniform sharks were quite large, and the Megalodon was the biggest among them, estimated to have measured up to 50 feet (15 meters) in length, about as long as a bowling lane. It was also substantially bigger than the next-biggest extinct shark in the Lamniformes order by at least 23 feet (7 meters).

While the Megalodon picture is now a little clearer than it was before, many fundamental questions about the size of the massive super-shark are still unanswered. Why Megalodon became extinct is another big fundamental question that remains unsettled, Shimada said.

Speaking about the value of the new findings, Shimada said understanding body sizes of extinct organisms is important in the context of ecology and evolution. "Lamniform sharks have represented major carnivores in oceans since the age of dinosaurs, so it is reasonable to assert that they must have played an important role in shaping the marine ecosystems we know today. This is why we need further information about them," he added.



Fires Engulf Türkiye’s Mediterranean Coast as Government Declares 2 Disaster Zones

People stand next to smoke rising from the wildfire in the Aksu district of Antalya, a Mediterranean city in southern Türkiye, July 25, 2025. (Reuters)
People stand next to smoke rising from the wildfire in the Aksu district of Antalya, a Mediterranean city in southern Türkiye, July 25, 2025. (Reuters)
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Fires Engulf Türkiye’s Mediterranean Coast as Government Declares 2 Disaster Zones

People stand next to smoke rising from the wildfire in the Aksu district of Antalya, a Mediterranean city in southern Türkiye, July 25, 2025. (Reuters)
People stand next to smoke rising from the wildfire in the Aksu district of Antalya, a Mediterranean city in southern Türkiye, July 25, 2025. (Reuters)

New wildfires broke out on Türkiye’s Mediterranean coast Friday, as the government declared two western provinces in the country to be disaster zones.

Images showed flames and smoke billowing into the sky close to high-rise apartment buildings in Antalya, where local and foreign visitors flock during the summer months.

Homes were evacuated in the city center and the outlying district of Aksu as the fire advanced, privately owned news agency DHA reported. Firefighters struggled to extinguish the blazes before strong winds could spread the fire, which closed a major coastal road.

Further along the coast, homes in the city of Manavgat were also threatened.

Local residents with hoses and buckets rushed to assist firefighters as water-dropping helicopters and planes also battled the flames. Police water cannons and municipal water trucks were also enlisted in the firefighting efforts.

Antalya Gov. Hulusi Sahin said that the fires were under control apart from one in Aksu, which was "showing a tendency to grow," and another in Gazipasa, east of Manavgat.

"The fires were truly disturbing and dangerous, because they occurred in city centers, among houses," he said. "We evacuated some of our homes ... There are no deaths or injuries."

At 46.1C (115F), July temperatures in Antalya city were the highest for the month since records began in 1930.

Interior Minister Ali Yerlikaya, meanwhile, said Friday that Izmir and Bilecik provinces had been declared "disaster areas affecting public life," one step below the most serious level of emergency.

Between June 27 and Thursday, residents from 120 neighborhoods nationwide were evacuated, Yerlikaya added, and more than 12,000 workers under the ministry’s authority, such as police and rescue staff, had fought the fires.

In a social media post, the minister said 311 homes had been destroyed or seriously damaged during the monthlong blazes and 85 temporary housing units were set up across three western provinces for those made homeless.

Speaking after Friday prayers, President Recep Tayyip Erdogan said that Türkiye was "faced with a truly great disaster." He said that 25,000 personnel were fighting fires across the country, assisted by 27 planes, 105 helicopters and 6,000 ground vehicles.

Türkiye has faced widespread outbreaks of forest fires since late June. Thirteen people have died, including 10 rescue volunteers and forestry workers killed Wednesday in a fire in Eskisehir, western Türkiye. The funerals for the 10 were on Thursday.

Temperatures above seasonal norms have been exacerbated by strong winds and dry conditions, resulting in dozens of wildfires.

East of Antalya, fires broke out in Adana and Mersin on Friday. Elsewhere in the country, firefighters continued battling blazes in Eskisehir and nearby Karabuk that have been raging for several days.

Albania battles fires

The heat wave in the eastern Mediterranean region saw 1,000 firefighters and soldiers battle flames in Albania as temperatures reached 42 C (107 F).

In the Albanian city of Elbasan, firefighters have been combating a weeklong blaze in the country’s central mountain forests. Fires have also broke out near the southern border with Greece.

Cyprus aftermath

In the aftermath of one of Cyprus’ worst wildfires in living memory, it wasn’t lost on Cypriot officials that climate change may have been a significant contributing factor to the pace and ferocity of the flames.

Both government spokesman Constantinos Letymbiotis and Fire Chief Nicos Longinos referred to the arid conditions, with temperatures hitting 44 C (111 F) and very strong winds that quickly overwhelmed fire crews.

Even 14 firefighting aircraft couldn’t douse the multiple, fast-moving fire fronts quickly enough.

Cyprus is in its third year of minimal winter rains on which it relies for drinking water and for agricultural purposes, even as the government is revving up additional desalination projects.

The fire that moved at breakneck speed left two dead, forced the evacuation of 16 communities, scorched dozens of homes and destroyed many orchards and farms.

Quizzed by a reporter about criticisms that the Fire Service didn’t move quickly enough, Longinos was on the verge of tears when he said that he and all his firefighters have taken an oath to "give their lives" if need be to save lives and property.