NATURE, ZHAO CHUANG
Fossils of squirrel-like animals found on a farm in northeastern China have features that indicate they were true mammals. The creatures, which lived about 160 million years ago, constitute a new clade, Euharamiyida. Their similarity to older fossils in the group Haramiyida suggests that mammals arose more than 200 million years ago, during the Late Triassic. Scientists from the American Museum of Natural History (AMNH) in New York City and the Chinese Academy of Sciences published their analysis of the fossils this week (September 10) in Nature.
Although bits and pieces of haramiyids were first discovered in the 19th century, and more complete skeletons were recently uncovered, it’s still unclear whether haramiyids were mammals. The new, related fossils have a three-boned middle ear that is ...
