Fig 5. Bivariate plot of the results of the linear regression of centroid size (CS) onto a) proximal humeral shape and b) glenoid cavity shape.

In a) the warps represent the shapes at a CS of 40 in the lower end of the regression slope, broadly corresponding to the smaller taxa (Ateles, Lagothrix and hylobatids) and at 160 (higher end of the regression slope), mainly corresponding to Gorilla; in b) the warps represent the shapes at a CS of 15 in the lower end of the regression slope, broadly corresponding to the smaller taxa (Ateles, Lagothrix and hylobatids) and at 60 (higher end of the regression slope), mainly corresponding to Gorilla. Convex hulls depict the range of dispersion of the different groups.