Fig. 3
From: Rates of morphological evolution, asymmetry and morphological integration of shell shape in scallops
Asymmetry in scallop shells among ecomorphs. a: degree of asymmetry, measured as absolute Procrustes distance between left-right valve shapes for all specimens, shown by ecomorphs. Procrustes distance 0, equivalve; more than 0, inequivalve. b: the rate of asymmetry (DA) evolution (σ2) among ecomorphs. Abscissa values are ×10−4. Dashed line represents the overall evolutionary rate of asymmetry across all species. Confidence intervals calculated via bootstrapping specimens in species means estimations