Maxillary Trigon

This feature has been discussed at length in Rak (1983). It is described as a furrow-like feature that occupies much of the infraorbital region and inferior malar. It is consistently present in P walkeri and P robustus, though it is variable in P. boisei (see Suwa et al., 1997). This feature is distinct from our other character, "facial dishing" (character 43), because it defines the depression within the infraorbital region only and not the mid-face as a whole. Indeed, while P boisei is characterized by strong facial dishing, it is not always marked by an infraorbital furrow.

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