Biology Reference
In-Depth Information
FIGURE 1.7
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Ontogenetic change in head
profile as implied by changes in the orienta-
tion of straight lines drawn between land-
marks of the head.
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5
2
6
14
15
1
7
16
8
13
12
11
10
9
FIGURE 1.8
Additional points on the
head profile that capture information about
its curvature. These points, which are not indi-
vidually homologous, are “semilandmarks”.
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3
5
2
6
1
15
7
14
16
8
13
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digitizing is exorbitant (in either time or money) and the results were not depicted at all
so the problems posed by projecting three-dimensional data onto a two-dimensional
page did not arise. However, when using calipers we do not collect three-dimensional
coordinates so the technology sidesteps rather than solves the problem. And tabulating
numbers rather than depicting results also sidesteps rather than solves the problem.
Although the equipment is costly and not always portable, and the results can be diffi-
cult to show, three-dimensional morphometrics is just as feasible mathematically as
two-dimensional morphometrics.
