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The modular nature of the trunk skeleton in anthropoid primates

The mammalian ribcage, spine, and pelvis share a variety of functional locomotor demands that are thought to result in strong covariation across the trunk skeleton and, hence, a unified response to selection. However, this hypothesis has never been formally tested, and preliminary results of research on primates suggest that torso shape variation in anthropoids is much greater than previously thought. This unexpected result suggests that the underlying patterns of covariation that characterize the relationships among bony elements of the trunk may also display a high degree of variation, likely in response to previously underappreciated selective pressures such as postural behavior, obstetrics, and ecogeography.