Anchisauria

(A) A phylogenetic principal-component analysis (PCA) represents the projection of the Dinosauria supertree (STAR Methods) into a PCA of climatic variables. PC1 axis shows strong positive correlation with maximum temperature ([temp max), low positive correlation with precipitation seasonality ( precip season), strong negative correlation with minimum temperature (Ytemp min), and strong negative correlation with minimum precipitation (Yprecip min). PC2 axis shows strong positive correlation with minimum temperature ([temp min) and negative correlation with precipitation seasonality (Yprecip season). Shadows around points highlight the relative density in the principal compo- nent space of non-dinosaurian Dinosauromorpha (gray), Ornithischia (blue), Sauropodomorpha (green), and Theropoda (red). (B) Lower left plot shows 95% confidence interval convex hulls for each dinosauromorph subclade. Blue thermometer (top left corner) symbolizes the direction of the vector in the PC space region for cold temper- atures; yellow thermometer (top right corner) indicates the direction of the vector in PC space for warm tem- peratures; brown shrub (top right corner) depicts dry conditions, while the same with a gray, rainy cloud (mid, lower side of the graph) illustrates seasonal conditions. Silhouettes represent the following taxa (clockwise from the higher left corner): Minmi, Edmontosaurus, Pachyrhinosaurus, Tyrannosaurus, Asilisaurus, Graci- liceratops, Harpymimus, Altirhinus, Gobititan, Suz- housaurus, Marasuchus, Pampadromaeus, Herrer- asaurus, Vulcanodon, Diplodocus, Giraffatitan, Coelophysis, Dromomeron, Gondwanatitan, Tapuiasaurus, Anchisaurus, Siamotyrannus, Diodorus, Suchomimus, Phuwiangosaurus, Ouranosaurus, Irritator, Tangvayosaurus, Nanshiungosaurus, Aeolosaurus, Rebbachisaurus, Chuxiongosaurus, Tethyshadros, Koreanosaurus. Genyodectes, Mapusaurus, Vegavis, Goyocephale, and Rhoetosaurus.

PLATE II(IX). Fig. 1. Anchisaurus colurus MARSH. All extant specimens in approximately 1/5 nat. size. Connecticut red sandstone (Upper Triassic). Manchester, Conn., USA. MARSH's original specimen, preserved at the Yale Museum, New Haven, Conn. Scale bar: 11 cm. Skull: see Pl. I [VIII], forefoot: see Pl. III [X], scapula, hindleg, and pubis: see figures in the text.

PLATE II(IX). Fig. 1. Anchisaurus colurus MARSH. All extant specimens in approximately 1/5 nat. size. Connecticut red sandstone (Upper Triassic). Manchester, Conn., USA. MARSH's original specimen, preserved at the Yale Museum, New Haven, Conn. Scale bar: 11 cm. Skull: see Pl. I [VIII], forefoot: see Pl. III [X], scapula, hindleg, and pubis: see figures in the text.

PLATE II(IX). Fig. 1. Anchisaurus colurus MARSH. All extant specimens in approximately 1/5 nat. size. Connecticut red sandstone (Upper Triassic). Manchester, Conn., USA. MARSH's original specimen, preserved at the Yale Museum, New Haven, Conn. Scale bar: 11 cm. Skull: see Pl. I [VIII], forefoot: see Pl. III [X], scapula, hindleg, and pubis: see figures in the text.

Photo of skeleton from Beijing Museum of Natural History, on display at Miami Science Museum

Photo of skeleton from Beijing Museum of Natural History, on display at Miami Science Museum

Photo of skeleton from Beijing Museum of Natural History, on display at Miami Science Museum