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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.
Homo erectus, an ancestor to modern humans, arose at least 1.8 million years ago. Around that time in the fossil record, archaeologists see big shifts in brain size and body size in ancient hominins.omo erectus, an ancestor to modern humans, arose at least 1.8 million years ago. Around that time in the fossil record, archaeologists see big shifts in brain size and body size in ancient hominins.