Inferior Orbital Margin Is Rounded Laterally

The inferior orbital margin is considered either rounded laterally or not rounded; that is, the inferolateral orbital margin is blunted, with a shallow bend posteriorly into the orbit. The overall significance of this feature in terms of function, development, and phylogeny remains obscure. But given that Strait et al. (1997) and Strait and Grine (2001) have included it in their detailed studies, this feature is retained here. Rounded corners in the taxa preserving this region are present in Gorilla, P. walkeri, and P. robustus only (= 1).

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