FIGURE 14. Scatter plots of observations by genus on (1, 3, 5) PCA-1 vs. PCA-3; and (2, 4, 6) PCA-2 vs. PCA-3. (1, 2) Rectifenestella, Hemitrypa, and Lyroporella (see Figure 12.4 for three-dimensional animation); (3, 4) Archimedes, Rectifenestella, and Fenestella (see Figure 15.1 for three-dimensional animation); and (5, 6) Cubifenestella, Apertostella, and Rectifenestella (see Figure 15.2 for three-dimensional animation).