Saurischia

Figure 1. Evolution of macroecological traits in Dinosauria. Large scale event in dinosaur evolution (a); the origin of dinosaurs (star), hyperthermals (volcano), the earliest fossil Avialae (bird), the earliest fossil angiosperm (flower), the Cretaceous/Palaeogene mass extinction (asteroid). Phylogeny of dinosaurs (b) redrawn from Sereno and adapted to the current consensus and upon which an ancestral state reconstruction of temperature niche (mean annual temperature) after Chiarenza et al. is plotted; Mesozoic palaeogeographies (c) for Triassic (T), Jurassic (J) and Cretaceous (K). Silhouette colours symbolize body mass for each of the taxa represented; information on dietary habits are plotted after Barrett and Zanno & Makovicky; numbers represent clades discussed through this study: 1, Ornithischia; 2, Thyreophora; 3, Ornithopoda; 4, Hadrosauroidea; 5, Marginocephalia; 6, Ceratopsia; 7, Saurischia; 8, Sauropodomorpha; 9, Sauropoda; 10, Theropoda; 11, Ceratosauria; 12, Tetanurae; 13, Coelurosauria; 14, Maniraptoriformes; 15, Maniraptora; 16, Deinonychosauria; 17, Avialae; 18, Ornithothoraces. Palaeogeographies modified from original plots via R package ‘mapast’ using plate models by Scotese.

Fossil skeleton of Guaibasaurus, a basal Saurischian dinosaur genus

1st row (early saurischians): Herrerasaurus ischigualastensis (herrerasaur), Eodromaeus murphi (basal theropod); 2nd row (theropods): Pelecanus occidentalis, Tyrannosaurus rex; 3rd row (sauropodomorphs): Apatosaurus louisae, Plateosaurus trossingensis.

1st row (early saurischians): Herrerasaurus ischigualastensis (herrerasaur), Eodromaeus murphi (basal theropod); 2nd row (theropods): Pelecanus occidentalis, Tyrannosaurus rex; 3rd row (sauropodomorphs): Apatosaurus louisae, Plateosaurus trossingensis.

1st row (early saurischians): Herrerasaurus ischigualastensis (herrerasaur), Eodromaeus murphi (basal theropod); 2nd row (theropods): Pelecanus occidentalis, Tyrannosaurus rex; 3rd row (sauropodomorphs): Apatosaurus louisae, Plateosaurus trossingensis.

Classification: Saurischia, Tyrannosauroidea Size: 2 meters (length) Feeding: carnivore

Ohmdenosaurus holotype specimen, on exhibit at the Urweltmuseum Hauff. The specimen includes a lower leg (tibia, astragalus, calcaneus). Labels after Wild, 1978. Wild, R. (1978). "Ein Sauropoden-Rest (Reptilia, Saurischia) aus dem Posidonienschiefer (Lias, Toarcium) von Holzmaden". Stuttgarter Beiträge zur Naturkunde, Serie B (Geologie und Paläontologie) (in German). 41: 1–15.

Reconstruction of the holotype skull (PIN 3906/2) of the Late Cretaceous sauropod Quaesitosaurus orientalis. Based on Kurzanov & Bannikov 1983,[1] missing elements restored after Nemegtosaurus.[2] Color Key   Preserved   Missing References ↑ (1983). "A new sauropod from the Upper Cretaceous of Mongolia". Paleontological Journal 2: 90−96. ↑ (2005). "Redescription of the mongolian sauropod Nemegtosaurus mongoliensis nowinski (dinosauria: Saurischia) and comments on late cretaceous sauropod diversity". Journal of Systematic Palaeontology 3 (3): 283−318. DOI:10.1017/S1477201905001628.

Fossil specimen RTMP 82.19.23 - A lacrimal, postorbitals, squamosals, frontals, parietals, and braincase referred to Latenivenatrix mcmasterae, but formerly assigned to Stenonychosaurus inequalis (=Troodon inequalis). Described by Currie, 1985. "Cranial anatomy of Stenonychosaurus inequalis (Saurischia, Theropoda) and its bearing on the origin of birds." Canadian Journal of Earth Sciences, 22(1), 643-658. 5d-dinosaur-camp-day2-20120802-15.jpg