Principal component analysis (PCA) of selected cranial metric variables (GLS wo.i, CBL, PC, BB, ZB, MB, LMxT, PL, C-C, M2-M2, LM and LMdT) of genetically confirmed specimens of Molossus distributed in Argentina. A PCA results are presented in a biplot chart with individuals (dots) and variables (blue arrows) plotted together in the PC1 vs PC2 space. Individuals of the same species are enclosed by a convex hull. The mass centroid of each group is indicated by an unlabeled plus sign. Data labels are referenced in File S1 (Table M3). Dot sizes of each specimen is proportional to its genetic information availability score (GIS, see File S1 for score definition details). B Percentages of each cranial variable’s contribution to the first two principal components (Dim1 and Dim2).