FIGURE 5 in Deciphering "cryptic" nature of European rock-dwelling Pyramidula snails (Gastropoda: Stylommatophora)

FIGURE 5 Result of geometric morphometrics using sixteen landmarks on the frontal shell view (supplementary fig. S2). Upper part: thin-plate splines, illustrating transitions in shape between pairs of species P. jaenensis and P. rupestris, and P. pusilla and P. saxatilis, and between the high-spired (former pair) and low-spired (latter pair) species combined. Lower part: Position of shells along the first two axes of the Canonical Variance Analysis (CVA1, CVA2) based on Procrustes shape coordinates of the landmark data. Convex polygons were added to the diagram to highlight the distinction between the four species. Type specimens of the respective species were also used in the analysis (see fig. 7 for details), and are shown in grey color.