Global ETD Search
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Showing 1 to 14 of 14 for “"theropod"”.
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The evolution of intraspecific variation, growth, and body size in early theropod dinosaurs
… the changes undergone during growth of two early theropod dinosaurs, Coelophysis bauri and Megapnosaurus rhodesiensis. To reconstruct the growth of these dinosaurs I used ontogenetic sequence analysis (OSA). I found that, unlike living birds, early dinosaurs possessed an extremely high amount of …
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Evaluation of tridactyl theropod tracks in southern Africa: quantitative morphometric analysis across the Triassic–Jurassic boundary
… skeletal remains are scarce, as is the case with theropod body fossils in the Elliot and Clarens formations. Herein, we present the findings of an extensive southern African field-based study to quantify the morphological variation of Grallator, Eubrontes and Kayentapus tracks across the TJB in …
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The Phylogeny of Basal Coelurosaurian Theropods (Archosauria: Dinosauria) and Patterns of Morphological Evolution during the Dinosaur-Bird Transition
Theropod dinosaurs are an iconic and familiar group of extinct species that include predators such as Tyrannosaurus and Velociraptor, as well as an array of other Mesozoic taxa. Carnivorous theropods are the evolutionary ancestors of birds, and the evolutionary transition between theropods and …
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The Refutation of Bird Evolution by a Study of Feathered Dromaeosaurs as a Created Kind
… dromaeosaurus, microraptor, and others. Theropod dinosaurs include allosaurs, ceratosaurs, and other carnivorous dinosaurs; those animals are indeed dinosaurs. While some evidence suggests that members of the smaller tyrannosaurids bore feathers, the larger ones such as T-Rex and …
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Taphonomy of a Lance Formation(Maastrichtian, WY) Dinosaur Bonebed with a Focus on Tooth Traces
… along the bone’s surface. Comparison with theropod teeth from the Lance Formation leads us to concludeit was bitten by another tyrannosaurid, suggesting possible cannibalism in the species <em>Tyrannosaurus rex</em>.</p>
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HISTOLOGICAL AND GEOCHEMICAL PROPERTIES OF PATHOLOGICAL VERSUS NORMAL BONE IN ALLOSAURUS FRAGILIS AND MODERN AVIANS
… fracture pathologies in pedal phalanges from the theropod dinosaur Allosaurus fragilis, and two modern bird species, Branta canadensis (Canada goose) and Cathartes aura (turkey vulture). Raman spectroscopy analysis was performed on modern birds, but not fossil material. Stable isotope and rare …
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Unravelling the palaeobiology of the dinosaurian post crania and associated carnivore teeth from the early jurassic, Elliot formation in the Eastern Cape
… teeth could possibly belong to two different theropod dinosaur, while the third tooth is likely from a crocodylomorph. In conclusion, this study of AM 6147 shows that it is a new large bodied Massospondylid from the Elliot Formation and provides a better understanding of the diversity of basal …
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The Rise of Modern Avian Flight: Wing Movement and Joint Mobility Within Ornithurae
… toothless beak, small body size) among non-avian theropod dinosaurs and Mesozoic bird-like taxa are now well understood. Yet, despite more than a century of research, the origin and evolution of avian flight itself remain poorly understood and the precise timing and mechanisms behind the emergence …
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The Origin and Early Evolution of the Dinosauria
… on how the principal clades within Dinosauria (Theropoda, Sauropodomorpha and Ornithischia) are related to one another is challenged by the results of these analyses. This study finds, for the first time, a sister-group relationship between Ornithischia and Theropoda, here termed Ornithoscelida. …
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Palaeoenvironmental change from the Hettangian to Toarcian in Moyeni (Quthing District), southwestern Lesotho
… (e.g., algal mats, vertebrate burrows, tracks of theropods, ornithischians, amphibians, crocodylomorphs). Sedimentological evidence indicates that in the Hettangian the area was prone to flash floods and drying in a low energy depositional system with small rivers and shallow lakes. The bulk of …
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Evolutionary dynamics of avian and non-avian limb morphology
… of these elements. In contrast, non-avian theropods and flightless birds likely had more relaxed biomechanical constraints on these elements, and therefore the potential for greater evolutionary lability. In chapter two of this thesis, we tested whether the relationships among limb elements …
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Oviraptorosauria: Morphology, Phylogeny, and Endocranial Evolution
… some of the most morphologically distinctive theropod taxa yet known. Their bizarre appearance and numerous skeletal similarities with extant birds instantly made oviraptorosaurs the subject of considerable interest when first discovered in the early 20th Century by the American Museum of …
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Locomotor Ontogeny and the Evolution of Avian Flight
<p>Understanding the origins of organismal diversity is one of biology's most enduring quests. Many authors have posited that modularity, or the developmental decoupling of body parts into discrete functional units, facilitates adaptive radiation by allowing body parts to become independently and …
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Locomotor Ontogeny and the Evolution of Avian Flight
<p>Understanding the origins of organismal diversity is one of biology's most enduring quests. Many authors have posited that modularity, or the developmental decoupling of body parts into discrete functional units, facilitates adaptive radiation by allowing body parts to become independently and …