Figure 3: The first two canonical variates of the canonical
variate analysis (CV1 and 2) of mandible shape variation amongst
localities of R. simulator . Light blue outline represents the
average shape; Dark blue outline shows the deviation of shape of
mandibles from the average. Locality abbreviations are the same as in
Fig. 1.
.
For R. cf. simulator , the first two canonical variates of the CVA
of shape variation amongst the localities explained 100% of the
variation (Fig. 4). CV1 was associated with changes in the total length
of the mandible, thickness of the ascending ramus and the thickness of
the alveolar bone as shown by the wireframe graphs (85% of the
variation; Fig. 4). The NZ localities fell at the positive end of CV1
and appeared to have a shorter total length of mandible, a thinner
ascending ramus, and a thinner alveolar bone than the average shape.
Conversely, DR and NE localities fell at the negative end of CV1 and had
a longer total length of mandible and thicker alveolar bone relative to
the average. CV2 was associated with ascending ramus dimensions and
position of the incisor teeth (15% of the variation; Fig. 4). The DR
locality was at the positive end of CV2 and had an outline implying a
shorter ascending ramus and more posterior incisors relative to the
average. NZ was at the negative end of CV2 suggesting a slightly longer
ascending ramus and slightly posterior incisors than the average shape
(Fig. 4).