Fig. 4

Ventral developmental trajectories are species-specific. Ventral morphospace is described by relative jaw width and mandible length (PC1) and distance between the basihyal to the mandible (PC2). Differences in shape were analyzed either a–d within a single day or e–g, i–k through ontogeny. Colors, symbols, and ellipses are as described in Fig. 3. Note that the plot is the same in (e–g, i–k), but with a different species highlighted. h, l Variation in ventral shape described by PC1 through ontogeny, depicted as deformation grids using thin-plate splines