Figure 5
From: Unveiling the third dimension in morphometry with automated quantitative volumetric computations
SAPID allows postural differences to be excluded from shape comparisons. (A) The same structure (a mammal hindlimb—femur and tibia/fibula) was scanned twice (boxes of the same color) in two different postures (a flexed and extended posture). Then scans of the same structure in different postures were compared to each other using SAPID (#1–2). As well, all combinations of different specimens in similar and different postures were compared (#3–6). (B) Despite different postures, SAPID successfully identified instances of the same structure in different postures as morphologically more similar (having smaller computed morphological distances) than comparisons of different structures. This suggests that whole body scans can be compared to quantify interspecific differences in body plan even though each specimen that is scanned has a unique posture. Red box = primate limb, Blue box = treeshrew limb.
