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      A Late Triassic dinosauriform from south Brazil and the origin of the ornithischian predentary bone

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      Historical Biology
      Informa UK Limited

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          The evolution of dinosaurs.

          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 the Cretaceous. The dinosaurian radiation, launched by 1-meter-long bipeds, was slower in tempo and more restricted in adaptive scope than that of therian mammals. A notable exception was the evolution of birds from small-bodied predatory dinosaurs, which involved a dramatic decrease in body size. Recurring phylogenetic trends among dinosaurs include, to the contrary, increase in body size. There is no evidence for co-evolution between predators and prey or between herbivores and flowering plants. As the major land masses drifted apart, dinosaurian biogeography was molded more by regional extinction and intercontinental dispersal than by the breakup sequence of Pangaea.
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            On the Classification of the Fossil Animals Commonly Named Dinosauria

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              Synopsis of the Extinct Batrachia, Reptilia and Aves of North America

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                Author and article information

                Journal
                Historical Biology
                Historical Biology
                Informa UK Limited
                0891-2963
                1029-2381
                January 2007
                January 2007
                : 19
                : 1
                : 23-33
                Article
                10.1080/08912960600845767
                efe91643-9e1f-423e-96a4-c50ee0304f45
                © 2007
                History

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