FIGURE 14 in Larval anatomy of Andean tadpoles of Telmatobius (Anura: Ceratophryidae) from Northwestern Argentina

FIGURE 14. Principal component analysis on the combined matrices of chondrocranium and hyobranchial skeleton shape variables (almost identical to the PCA on the hyobranchial skeleton matrix). The discrimination of species is clearer on the PC2; grids depict modeled specimens on this axis, with maximum (top) and minimum (bottom) scores. Shape change implies a slight enlargement of the relative size of the branchial basket (enclosed area), and a widening of the buccal pocket (arrow). The classification according to biogeographical regions is based on Laurent (1970) and Olson et al. (1998).