Fig. 2 in The ontogeny of the lower reproductive tract of the landsnail Helix aspersa (Gastropoda: Mollusca)

Fig. 2 The thin-plate spline bending energy of pairwise comparisons of adjacent developmental stages. 1= initial landmark deformations, 2 = straightening of flagellum; both of these events likely represent artificial morphological changes. Linear regression of log-transformed bending energies, without the problematic A-B and D2-E values, gives an r2 value of 0.9565