FIGURE 3 in Operculum shape variation in Theodoxus Montfort, 1810 (Gastropoda: Neritidae)

FIGURE 3. Canonical Variate Analysis (CVA) showing operculum shape differences among males and females of three Theodoxus species in the space of the first two CV axes covering 92.83% of the total sample variability (CV1 73.58% and CV2 19.25%). The pattern of operculum shape differences among males and females of three Theodoxus species corresponding to the first two CV axes is shown on a thin plate spline deformation grids. The average positions of the landmarks are linked with vectors pointing in the direction of shape changes along the axes.