Fig. 2: Endocranial shape variation in extant birds, non-avian dinosaurs, and American alligator. | Nature Communications

Fig. 2: Endocranial shape variation in extant birds, non-avian dinosaurs, and American alligator.

From: Endocranial development in non-avian dinosaurs reveals an ontogenetic brain trajectory distinct from extant archosaurs

Fig. 2

Morphospaces constructed from first two principal components (PC) axes of (a) total endocast shape (inset images along axes illustrate extremes of shape changes along PC1 and PC2 axes; green, blue, and purple arrows show the general ontogenetic direction of Alligator, Psittacosaurus, and Gallus, respectively); b cerebrum shape; c cerebellum shape; d optic lobe shape; e brainstem shape. The regional shape data were extracted by performing local Procrustes alignment within each region.

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