Scatter plot of the Principal Components Analysis (PCA) and correlation matrix for the nineteen environmental variables from WorldClim2 for Ceratophryidae. PCA for extant (A) species of Chacophrys, Lepidobatrachus, and (B) Ceratophrys in South America. Values in the x-axis are the percentage of variance explained mostly by the principal component 1 (PC1) and on the y-axis principal component 2 (PC2). The colored dots represent individual occurrences per species in the PCA and are surrounded by 95% ellipses. (C) Correlation plot with positive (blue) or negative (red) direction that show the collinearity between environmental variables. Variables names are detailed in Table 1.