FIGURE 4 in A new species of freshwater mussel in the genus Popenaias Frierson, 1927, from the Gulf coastal rivers of central Mexico (Bivalvia: Unionida: Unionidae) with comments on the genus

FIGURE 4. Biplots from principal component analysis (PCA; A) and canonical variate analysis (CVA; B) of Fourier shape morphometrics. Colors and shapes of points correspond to species: blue circles, Popenaias popeii; green squares, P. ganina; orange diamonds, P. berezai n. sp. Polygons enclose convex hulls of each species. Outlined shell shapes represent a mean shape (top-right) and ±2 × SD on PC1 and PC2 axes.