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2015 ; 112
(38
): 11829-34
Nephropedia Template TP
gab.com Text
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English Wikipedia
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
PMID26351685
show ga
Reconstructing the behavioral shifts that drove hominin evolution requires
knowledge of the timing, magnitude, and direction of anatomical changes over the
past ?6-7 million years. These reconstructions depend on assumptions regarding
the morphotype of the Homo-Pan last common ancestor (LCA). However, there is
little consensus for the LCA, with proposed models ranging from African ape to
orangutan or generalized Miocene ape-like. The ancestral state of the shoulder is
of particular interest because it is functionally associated with important
behavioral shifts in hominins, such as reduced arboreality, high-speed throwing,
and tool use. However, previous morphometric analyses of both living and fossil
taxa have yielded contradictory results. Here, we generated a 3D morphospace of
ape and human scapular shape to plot evolutionary trajectories, predict ancestral
morphologies, and directly test alternative evolutionary hypotheses using the
hominin fossil evidence. We show that the most parsimonious model for the
evolution of hominin shoulder shape starts with an African ape-like ancestral
state. We propose that the shoulder evolved gradually along a single morphocline,
achieving modern human-like configuration and function within the genus Homo.
These data are consistent with a slow, progressive loss of arboreality and
increased tool use throughout human evolution.