Figure 3
Principal components decomposition of topological variables. (A) Skull distribution for each taxon (see labels below). (B) Comparison of Avialae versus non-Avialae shows that non-Avialae occupy part of the Avialae morphospace. (C) Comparison of Neornithes versus non-Neornithes shows that non-Neornithes overlap with part of the Neornithes morphospace. Orange dotted arrows show the ontogenetic change in modern birds from juvenile stage to adult stage. (D) Comparison of Aves, Crurotarsi, and Dinosauria shows that they occupied different morphospace. Ellipses show a normal distribution confidence interval around groups for comparison. Labels: N, Number of nodes; K, Number of links; D, Density of Connection; C, Mean clustering coefficient; H, Heterogeneity of connection; L, Mean path length; A, Assortativity of connection; P, Parcellation. Aeto, Aetosaurus; AllA, adult Alligator; AllJ, juvenile Alligator; Arcx, Archaeopteryx; Citi, Citipati; Coel, Coelophysis; Comp, Compsognathus; Croc, Crocodylus; Dako, Dakosaurus; Desm, Desmatosuchus; Dibo, Dibothrosuchus; Dilo, Dilophosaurus; Eora, Eoraptor; GalA, adult Gallus; GalJ, juvenile Gallus; GeoA, adult Geospiza; GeoJ, juvenile Geospiza; Icht, Ichthyornis; NotA, adult Nothura; NotJ, juvenile Nothura; Plat, Plateosaurus; Psit, Psittacosaurus; Rioj, Riojasuchus; Sphe, Sphenosuchus; Velo, Velociraptor. Silhouettes were from Phylopic.org.
