EUREKALERT, TSENG, ET AL.Based on molecular phylogenetic analyses of living species, scientists believed that pantherines—big cats like lions, tigers, and snow leopards—emerged in Asia about 10 million years ago, even though they did not have physical evidence older than 3.6 million-year-old fossils found in Tanzania. Now, Chinese and American paleontologists have uncovered fossils from a newly discovered species of big cat (Panthera blytheae) in the Tibetan Plateau that are between 4 million and 6 million years old. Their work was published today (November 13) in Proceedings of the Royal Society B.
“The study is very important because fossils of big cats are extremely rare,” Lars Werdelian of the Swedish Museum of Natural History in Stockholm, who was not involved in the study, told New Scientist. “The new findings lend strong support for the Asian origin of big cats,” he added.
The research team, led by the University of Southern California’s Jack Tseng, who is now a postdoctoral fellow at the American Museum of Natural History in New York City, found a partial skull, plus several jaw and tooth fragments of P. blytheae. They concluded that the cat was a new species that was closely related to the living snow leopard (Panthera uncia), but smaller, probably weighing around 50 to 60 pounds. The scientists estimated the age of the skull to be up to 6 million years old based on the rock in which it was found. They also suggested that P. blytheae is an intermediate on the big cat evolutionary tree. “Somewhere there is probably a more primitive big cat, waiting to be found,” Tseng told Popular Science.
William Murphy, a molecular geneticist at Texas A&M University, told Science NOW that he is skeptical of the link between P. blytheae and snow leopards because the researchers based their conclusions on so few skeletal pieces. “It’s possible that this fossil species might have a deeper ancestry in the Panthera tree,” Murphy said, but to be sure, scientists need to find more complete fossils.