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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.
Sinodelphys One of the earliest marsupials yet discovered. Steropodon This platypus ancestor lived 15 million years after Teinolophos. Teinolophos An early ancestor of the modern platypus. Triconodon A common mammal of the late Jurassic.inodelphys One of the earliest marsupials yet discovered. Steropodon This platypus ancestor lived 15 million years after Teinolophos. Teinolophos An early ancestor of the modern platypus. Triconodon A common mammal of the late Jurassic.