Fig. 5: Geometric morphometric analysis of Sinovenator brain endocast.
From: Avialan-like brain morphology in Sinovenator (Troodontidae, Theropoda)
A Phylomorphospace based on the first two principal components (PC) of endocast shapes. Insert line images along the axes depict endocranial shapes at extremes of PC1 and 2 axes, colored according to region (green, cerebrum; red, optic lobe; blue, cerebellum; yellow, brainstem). Colored silhouettes of representative taxa are from https://www.phylopic.org/ and under the CC0 1.0 Universal Public Domain Dedication license, Alligator missisipensis by Ferran Sayol, Archaeopteryx lithographica by Scott Hartman, T.rex by Manuel Brea Lueiro, and Gallus gallus by Steven Traver. B UPGMA clustering analysis based on pairwise Euclidean distances among specimens showing that Sinovenator closely resembles Archaeopteryx. C Bivariate plots of PC1 of residuals from the common allometric component (CAC) against scores along CAC. The solid lines and grey bands indicate regression lines and 95% confidence interval for extant birds and nonavialan dinosaurs separately.
