One of them, Mixodectes pungens lived in western North America during the early Paleocene–about about 66 to 56 million years ago. It was first discovered over 140 years ago by paleontologist ...

For more than 140 years, Mixodectes pungens, a species of small mammal that inhabited western North America in the early Paleocene, was a mystery. What little was known about them had been mostly ...