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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.
In biology, the most recent common ancestor (MRCA) of any set of organisms is the most recent individual from which all organisms in a group are directly descended.The term is often applied to human genealogy.The MRCA of a set of individuals can sometimes be determined by referring to an established pedigree.or lowest common ancestors in graph theory and computer science, see Lowest common ancestor. In biology, the most recent common ancestor (MRCA) of any set of organisms is the most recent individual from which all organisms in a group are directly descended. The term is often applied to human genealogy.