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Fossil hominin shoulders support an African ape-like last common ancestor of humans and chimpanzees #MMPMID26351685
Young NM; Capellini TD; Roach NT; Alemseged Z
Proc Natl Acad Sci U S A 2015[Sep]; 112 (38): 11829-34 PMID26351685show ga
Knowing the direction and pace of evolutionary change is critical to understanding what selective forces shaped our ancestors. Unfortunately, the human fossil record is sparse, and little is known about the earliest members of our lineage. This unresolved ancestor complicates reconstructions of what behavioral shifts drove major speciation events. Using 3D shape measurements of the shoulder, we tested competing evolutionary models of the last common ancestor against the fossil record. We found that a sustained shift in scapular shape occurred during hominin evolution from an African ape-like ancestor to a modern human-like form, first present in our genus, Homo. These data suggest a long, gradual shift out of the trees and increased reliance on tools as our ancestors became more terrestrial.