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Maintained by pioweb@ucsc.edu. The common ancestor of placental mammals probably looked like Eomaia scansoria, the earliest known placental mammal, shown here in an artist's reconstruction based on a 125-million-year-old fossil skeleton found in China in 2002.aintained by pioweb@ucsc.edu. The common ancestor of placental mammals probably looked like Eomaia scansoria, the earliest known placental mammal, shown here in an artist's reconstruction based on a 125-million-year-old fossil skeleton found in China in 2002.
However, haramiyida evolved very distinct features. Therefore, scientists concluded that they evolved from a common ancestor, confirming mammals originated some roughly 208 million years ago. They published their findings Wednesday in the journal Nature. Check out the whole motley crew of our early relatives below.