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  • Influence
The evolution of dinosaurs.
  • P. Sereno
  • Biology, Medicine
  • Science
  • 25 June 1999
The ascendancy of dinosaurs on land near the close of the Triassic now appears to have been as accidental and opportunistic as their demise and replacement by therian mammals at the end of theExpand
Early Evolution and Higher-Level Phylogeny of Sauropod Dinosaurs
The cladistic analysis presented here focuses on higher-level relationships among sauropods, and identifies Neosauropoda as a new taxon that includes Haplocanthosaurus, Camarasaurus, and Titanosauriformes. Expand
Basal Archosaurs: Phylogenetic Relationships and Functional Implications
Erect posture has been identified as the key adaptation (possibly associated with locomotor stamina) that resulted in the archosaurian radiation. Expand
The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins
Dating of sanidine from a bentonite interbedded in the Ischigualasto Formation of northwestern Argentina yielded a plateau age of 227.8 � 0.3 million years ago, diminishing the magnitude of the proposed late Carnian tetrapod extinction event. Expand
Lesothosaurus, “Fabrosaurids,” and the early evolution of Ornithischia
New materials of Lesothosaurus diagnosticus permit a detailed understanding of one of the earliest and most primitive ornithischians and suggests long-axis rotation of the mandibular rami during mastication. Expand
A Basal Dinosaur from the Dawn of the Dinosaur Era in Southwestern Pangaea
A previously unidentified basal theropod is described, its contemporary Eoraptor is reassessed as a basal sauropodomorph, the faunal record of the Ischigualasto Formation is divided with biozones, and the formation is bracketed with 40Ar/39Ar ages. Expand
Predatory Dinosaurs from the Sahara and Late Cretaceous Faunal Differentiation
Late Cretaceous (Cenomanian) fossils discovered in the Kem Kem region of Morocco include large predatory dinosaurs that inhabited Africa as it drifted into geographic isolation. One, represented by aExpand
Structural Extremes in a Cretaceous Dinosaur
Skeletal and dental evidence suggests that Nigersaurus was a ground-level herbivore that gathered and sliced relatively soft vegetation, the culmination of a low-browsing feeding strategy first established among diplodocoids during the Jurassic. Expand
New dinosaurs link southern landmasses in the Mid–Cretaceous
Fossils from three stratigraphic levels in the Cretaceous of Niger provide definitive evidence that abelisauroid dinosaurs and their immediate antecedents were also present on Africa and provide key evidence for continued faunal exchange among Gondwanan landmasses until the end of the Early Cret Jurassic. Expand