Fig. 2

Ontogenetic allometric trajectories derived from the phenotypic allometric trajectory analysis (a) and the species ontogenetic allometric patterns identified by life habit (b). For both plots, the size of points for each specimen is scaled to centroid size. In a, specimens are plotted on a morphospace represented by PCs 1 and 2 on the x and y axes respectively. The arrows represent predicted trajectories for each species. Vectors represent ontogenetic trajectories of different species. The start of an arrow represents the mean juvenile shape and the end of the arrow represents the mean adult shape. The grey points represent the total variation within the sample. TPS deformation grids represent the shape change from the mean shape of the data set to the shape at the minimum and maximum values on that axis. In b, the x-axis represents log-transformed centroid size, and the y-axis represents the first principal component of the predicted values of multivariate regression of shape on size (as identified by MANCOVA). TPS deformations grids represent the shape change from the mean shape of the data set to the shape of the smallest and largest specimens in the data set