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

<p>Top Row: Boxplots of orbit height considering UW 88–886 separately (left) and within <i>P</i>. <i>angusticeps</i> (right). Note that <i>P</i>. <i>izodi</i> has significantly taller orbits than both <i>P</i>. <i>angusticeps</i> and <i>P</i>. <i>h</i>. <i>cynocephalus</i>. UW 88–886 has tall orbits compared to other <i>P</i>. <i>angusticeps</i> specimens, but within a reasonable range of expected variation for a species. Middle Row: Boxplots of orbit area (mm<sup>2</sup>) considering UW 88–886 separately (left) and within <i>P</i>. <i>angusticeps</i> (right). <i>P</i>. <i>izodi</i> has significantly larger orbits than <i>P</i>. <i>angusticeps</i>, but a non-significant difference compared to <i>P</i>. <i>h</i>. <i>cynocephalus</i>. The difference between <i>P</i>. <i>angusticeps</i> and <i>P</i>. <i>h</i>. <i>cynocephalus</i> is also non-significant. UW 88–886 appears to have large orbits compared to other <i>P</i>. <i>angusticeps</i> 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 <i>P</i>. <i>angusticeps</i> (right). <i>P</i>. <i>izodi</i> has a significantly shorter malar height compared to <i>P</i>. <i>angusticeps</i> and <i>P</i>. <i>h</i>. <i>cynocephalus</i>, but the difference between <i>P</i>. <i>angusticeps</i> and <i>P</i>. <i>h</i>. <i>cynocephalus</i> is non-significant. UW 88–886 is closest to the average of other <i>P</i>. <i>angusticeps</i> specimens. See also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0133361#pone.0133361.t002" target="_blank">Table 2</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0133361#pone.0133361.g005" target="_blank">Fig 5</a>.</p>