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Figure 4 | BMC Evolutionary Biology

Figure 4

From: Biogeography, phylogeny, and morphological evolution of central Texas cave and spring salamanders

Figure 4

Scatterplots of factor scores from principal components analysis (PCA) of log 10 -transformed measurements. 4a–c: Ordination of specimens of the eastern Blepsimolge (circles) and Typhlomolge (squares; includes E. rathbuni and E. waterlooensis) clades are shown. Closed and open symbols represent specimens collected from cave and surface localities, respectively. 4d: Ordination of morphological variation within and among cave populations of central Texas Eurycea (PC1 vs. PC2). Populations with N > 3 are shown with colored convex hull polygons (individual specimens removed except for outliers). Light gray circles indicate surface specimens; dark gray circles indicate cave specimens from localities with N ≤ 3.

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