Available craniometric comparisons in P. angusticeps, UW 88–886, P. h. cynocephalus, and P. izodi.

Top Row: Boxplots of orbit height considering UW 88–886 separately (left) and within P. angusticeps (right). Note that P. izodi has significantly taller orbits than both P. angusticeps and P. h. cynocephalus. UW 88–886 has tall orbits compared to other P. angusticeps specimens, but within a reasonable range of expected variation for a species. Middle Row: Boxplots of orbit area (mm2) considering UW 88–886 separately (left) and within P. angusticeps (right). P. izodi has significantly larger orbits than P. angusticeps, but a non-significant difference compared to P. h. cynocephalus. The difference between P. angusticeps and P. h. cynocephalus is also non-significant. UW 88–886 appears to have large orbits compared to other P. angusticeps specimens, but again within a reasonable range of expected variation for a species. Bottow Row: Boxplots of relative malar height considering UW 88–886 separately (left) and within P. angusticeps (right). P. izodi has a significantly shorter malar height compared to P. angusticeps and P. h. cynocephalus, but the difference between P. angusticeps and P. h. cynocephalus is non-significant. UW 88–886 is closest to the average of other P. angusticeps specimens. See also Table 2 and Fig 5.