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Tyrannosaur Paleobiology: New Research on Ancient Exemplar Organisms
Tyrannosaurs Revisited Tyrannosaurs represent some of the most successful and largest carnivores in Earth's history. An expanding fossil record has allowed studies of their evolution and behaviorExpand
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A long-snouted, multihorned tyrannosaurid from the Late Cretaceous of Mongolia
Tyrannosaurid theropods are characterized by a generalized body plan, and all well-known taxa possess deep and robust skulls that are optimized for exerting powerful bite forces. The fragmentary LateExpand
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Birds have paedomorphic dinosaur skulls
The interplay of evolution and development has been at the heart of evolutionary theory for more than a century. Heterochrony—change in the timing or rate of developmental events—has been implicatedExpand
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Evolutionary origins of the avian brain
Features that were once considered exclusive to modern birds, such as feathers and a furcula, are now known to have first appeared in non-avian dinosaurs. However, relatively little is known of theExpand
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Evolutionary Origin of the Turtle Shell
The origin of the turtle shell has perplexed biologists for more than two centuries. It was not until Odontochelys semitestacea was discovered, however, that the fossil and developmental data couldExpand
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A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)
Abstract We review the morphology, taxonomy, and phylogenetic relationships of the upper Cretaceous Mongolian troodontid Saurornithoides. Saurornithoides mongoliensis is known only by the holotypeExpand
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The Braincase of Apatosaurus (Dinosauria: Sauropoda) Based on Computed Tomography of a New Specimen with Comments on Variation and Evolution in Sauropod Neuroanatomy
Abstract We describe a previously unreported braincase of the sauropod dinosaur Apatosaurus from the Cactus Park Quarry, Morrison Formation of western Colorado using high-resolution X-ray computedExpand
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Finding the frame shift: digit loss, developmental variability, and the origin of the avian hand
SUMMARY The origin of the tridactyl hand of crown birds from the pentadactyl hand of those early theropod dinosaurs lying along the avian stem has become a classic, but at times seeminglyExpand
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Transitional fossils and the origin of turtles
The origin of turtles is one of the most contentious issues in systematics with three currently viable hypotheses: turtles as the extant sister to (i) the crocodile–bird clade, (ii) theExpand
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The Bipedal Stem Crocodilian Poposaurus gracilis: Inferring Function in Fossils and Innovation in Archosaur Locomotion
ABSTRACT We introduce a spectacular new specimen of a Late Triassic stem crocodilian identified as Poposaurus gracilis. It is part of a poorly known group, Poposauroidea, that, because of itsExpand
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