FIGURE 3 in Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with descriptions of two new species

FIGURE 3. Principal components analysis (PCA) of 10 morphometric and eight meristic characters comparing G. pantanal (red) to G. riberalta (blue). Ellipses represent 95% confidence intervals. A. In the morphometric analysis comparing G. pantanal (n=18), and G. riberalta (n=10), principal component one is influenced strongly negatively by head depth (HD), head width (HW), and mouth width (MW), while principal component two is influenced strongly positively by postorbital distance (PO) and is influenced strongly negatively by head length (HL). B. In the meristic analysis comparing G. pantanal (n=15), and G. riberalta (n=8), principal component one is influenced strongly positively by the number of anal-fin pterygiophore scales (APS) and the number of pored lateral-line scales and is influenced strongly negatively by the number of pectoral fin rays, while principal component two is influenced strongly positively by the number of scales above the lateral line (SAL) and the number of band pairs (BND).