Fig. 2

Overview of the landmark placement on skeletal traits (A) used to characterize body shape (B) and head shape (C). Head shape was analyzed separately to avoid masking effects of small but important cranial trajectories by larger body shape differences. Figures below illustrate the shape trajectories identified as explaining the greatest variance in the first and second principal component. Mean shapes of the PC are illustrated as a grey shape, whereas minimum and maximum states along the trajectories are given as orange and purple outlines, respectively. Main axes of variation among species include depth or elongation of body shapes, mouth size and head profiles