by Sara G. Miller, Staff Writer | September 02, 2015 09:03am ET
The fossilized remains of a new species of ancient river dolphin that lived at least 5.8 million years ago have been found in Panama, and the discovery could shed light on the evolutionary history of these freshwater mammals.
Researchers found half a skull, a lower jaw with an almost complete set of conical teeth, a right shoulder blade and two small bones from a flipper. The fossils are estimated to be between 5.8 million and 6.1 million years old, making them from the late Miocene epoch, researchers said in a new study.
The ancient river dolphin, named Isthminia panamensis, was calculated to be more than 9 feet (2.7 meters) long, according to the study.
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