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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.
Rating Newest Oldest. Best Answer: That there is a common ancestor of Apes and Humans, is all pure speculation. There should be an abundance of fossil evidence for all kinds of common ancestors, but there's not one single shred on the face of this planet.Those that have been offered so far are way off target.e share a common ancestor with chimpanzees and bonobos. Evolution does not 'state' this. It is clearly evident in our shared anatomical features, our DNA, and in our fossil record. As for what is the common ancestor, the common ancestor was a prehistoric African forest ape.