Analysis 1: Decomposition of shape variation for symmetry with respect to reflection and rotation of order 2. This figure shows examples of PCs that account for the maximum of variance for each category of shape variation. Each diagram shows the symmetric consensus (open circles and dotted lines) and the differences between the consensus and the other configuration (solid circles and solid lines) represent the shape change associated with the respective PC by an arbitrary amount of + 0.1 units of Procrustes distance. The percentages represent the part of the total shape variation for which each PC accounts. A. Asymmetric component, symmetric under rotation of order 2. B. Symmetric component. C. Asymmetric component, symmetric relative to reflection about the horizontal axis. D. Asymmetric component, symmetric under reflection about the vertical axis.
Savriama and Klingenberg BMC Evolutionary Biology 2011 11:280 doi:10.1186/1471-2148-11-280