Figure 8 in A giant nektobenthic radiodont from the Burgess Shale and the significance of hurdiid carapace diversity

Figure 8. Evolution of radiodont H-element shape and feeding ecology. (a) Radiodont clade cut from a parsimony strict consensus tree optimized under implied weights (k = 3) with discrete characters describing carapace shape (D tree), colours (unrelated to those in figure 7) represent inferred feeding ecologies with parsimony ancestral states mapped over branches (red, macrophagous raptorial predator; green, suspension feeder; light blue, macrophagous sediment sifter; dark blue, microphagous sediment sifter; black, unknown; purple dot, root), numbers at nodes are symmetric resampling supports; (b) PCA phylomorphospace based on the same topology (excluding taxa for which shape is incompletely known), plotting RFTRA-aligned mean H-element shape for each species, with ancestral states estimated in TNT by optimizing the landmark configurations on a constrained topology, colours as in (a). (See electronic supplementary material for complete tree topology and results using alternative methods).