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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.
Pakicetus is believed to be the whale s oldest ancestor. These animals lived around 52 million years ago, in the early Eocene. The first evidence of Pakicetus was found in Pakistan, which is how it got its name. Pakicetus was a mammal that looked much like a dog with hoofs.