We've been drawing these saber-toothed cats all wrong

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We've been drawing these saber-toothed cats all wrong
An undated image provided by Mauricio Anton shows an illustration of a present-day lion’s skull. A new study suggests that Homotherium latidens, an extinct species of saber-toothed cat, concealed its deadly teeth when not on the attack. Mauricio Anton via The New York Times.

by Anthony Ham

NEW YORK, NY.- Close your eyes and picture being face to face with a saber-toothed cat. Most likely you will see in your frightened mind’s eye the long, curved upper canines — particularly sinister because those dagger-shaped teeth remained in full view, even when the cat closed its mouth.

What appears in your imagination may be incorrect, at least for a species of saber-toothed cat that was one of the most widespread in Earth’s ancient history. In a study published last month in the journal Quaternary Science Reviews, a team of researchers argues that many artistic reconstructions of Homotherium latidens are wrong. Depictions of the cats with pointy teeth at the ready need to be revised, because the animal’s defining feature was a concealed weapon until the cat was ready to strike or otherwise opened its mouth.

Homotherium latidens was “the most powerful saber-tooth cat of the Old-World Pleistocene,” said Mauricio Antón, a paleontological artist, expert on saber-toothed cats and one of the study’s authors. According to the fossil record, Homotherium first appeared around 4 million years ago, during the Pliocene. The species ranged from the southernmost tip of Africa, across Eurasia and into South America. A fossil site in Friesenhahn Cave in Texas suggested that groups of Homotheriums may have hunted cooperatively to bring down mammoths. The species fell extinct 10,000 years ago.

The cat was the size of a lion, weighed up to 550 pounds and had long, scimitar-shaped, serrated upper canines. In a paper Antón wrote in 2009, he concluded, “The tips of the sabers of Homotherium would have been visible in life, protruding beyond the lips,” even when the cat was at rest. In other words, Homotherium fit the stereotypical profile of the saber-toothed cat.

But more recently, Antón began to wonder if he and other paleontological researchers were getting the cat’s deadly dentition wrong.

For decades, almost everything that scientists knew about saber-toothed cats came from fossils and dissections of modern big cats. “When you dissect a dead big cat, the lips are in particular position because the muscles that control the lips are relaxed,” Antón said. “That was where our data came from.”

Then in 2016, while watching a film he had made of a magnificent, yawning male lion in the Okavango Delta, Antón noticed something he had never seen before: “The lower lip was contracting as the mouth was closing, and before full closure, it was enveloping the tip of the canine. I was like, ‘Am I really seeing this?’ It was a eureka moment.”

To understand the implications of his observation, Antón and a team of scientists studied living big cats in minute detail. They looked at fossil dissections with what Antón described as “new eyes.” And they made a 3D CT scan of an intact, 3-million-year-old fossil of a Homotherium latidens that had been excavated in Perrier, France.

Gema Siliceo, a postdoctoral researcher at Comenius University in Slovakia and co-author of the study, said that combining these techniques provides “a huge amount of information that we can use to infer the life appearance of an extinct felid.”

Their studies confirmed that there simply was not room for the lower lip and soft tissue to fit between Homotherium’s upper canine and the gum. But there was room for the canines to be hidden against the enclosed part of the lower mandible or jaw.

Whatever their aesthetics, saber-toothed cats remained frightening predators. Unlike modern big cats such as lions and tigers, the narrow, bladelike teeth of Homotherium were “precision weapons,” said Antón. “Once the sabers cut the arteries of the neck,” he added, “the animal lost blood very quickly and would pass out in seconds.”

A lion’s upper canines are around 1.5 inches long. Homotherium’s were 3 inches long. Those of the largest saber-toothed cat, the 900-pound Smilodon fatalis, may have been 6 inches long, which is why the new findings do not apply to the teeth of the Smilodon: no jaw could accommodate such a tooth.

Even so, the study’s authors wonder where detective stories such as this one might lead next. “We know around 30-40 species of saber-toothed cats,” said Siliceo, “but there are still many others to be found.” Even this year, scientists in China described a previously unknown dwarf sabretooth and another the size of a jaguar.

According to Antón, this could be just the start. “We have a whole biosphere in museum drawers just waiting to be discovered.”

This article originally appeared in The New York Times.

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