New evidence concerning avian origins from the Late Cretaceous of Patagonia

@article{Novas1997NewEC,
  title={New evidence concerning avian origins from the Late Cretaceous of Patagonia},
  author={Fernando Emilio Novas and Pablo F. Puertat},
  journal={Nature},
  year={1997},
  volume={387},
  pages={390-392}
}
The spate of recent discoveries of Mesozoic birds has substantially improved our understanding of the early evolution of birds and flight1–5, but has failed to close the morphological gap between the Upper Jurassic Archaeopteryx lithographica, the earliest known bird, and the Dromaeosauridae, the group of non-avian theropod dinosaurs regarded as most closely related to birds6,7. Here we describe a theropod dinosaur from Patagonia, Unenlagia comahuensis gen. et sp. nov., which partially fills… 
Paravian Phylogeny and the Dinosaur-Bird Transition: An Overview
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It is concluded that troodontid affinities of anchiornithines, and dromaeosaurids affinITIES of microraptorians and unenlagiids are dismissed in favor of sister group relationships with Avialae, and main phylogenetic hypotheses that compete some topics about the non-avian dinosaur-bird transition are analyzed.
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There is no evidence for a major or mass extinction of birds at the end of the Cretaceous, nor for a sudden ‘bottleneck’ in diversity that fostered the early Tertiary origination of living bird ‘Orders’.
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Mapping some of the salient features onto a temporally-calibrated theropod phylogeny indicates that characteristics related to flight and arboreality evolved at the base of the Paraves, earlier than the Late Jurassic.
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A near-complete, small dromaeosaurid is described that is both the most complete and the earliest member of the Maniraptora from South America and which provides new evidence for a unique Gondwanan lineage of DromaeOSauridae with an origin predating the separation between northern and southern landmasses.
New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana
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A new paravian from the Cenomanian-Turonian (Late Cretaceous) of Río Negro province, NW Patagonia, Argentina is found that probably constitutes a previously unknown grade in the avian-line theropods in which some flight-related adaptations of the forelimbs are present in cursorial taxa.
Feathered dinosaurs from China and the evolution of major avian characters.
  • Xing Xu
  • Biology, Medicine
    Integrative zoology
  • 2006
TLDR
An evolutionary model is proposed here to describe the major stages of feather evolution, a process characterized by a combination of both transformational and innovative modifications.
Non‐avian dinosaur fossils from the Lower Cretaceous Jehol Group of western Liaoning, China
TLDR
The discovery of four-winged dinosaurs was suggested to provide strong evidence supporting the ‘tree-down’ hypothesis for the origin of avian flight, though in-depth analysis and more data are needed to confirm this.
New Patagonian Cretaceous theropod sheds light about the early radiation of Coelurosauria
TLDR
Bicentenaria amplifies the array of basal coelurosaurs that inhabited Gondwana during the Cretaceous, also including compsognathids, Aniksosaurus and Santanaraptor, and reveals the importance of the new taxon in the understanding of the early diversification of Coelurosauria.
Juvenile Birds from the Early Cretaceous of China: Implications for Enantiornithine Ontogeny
TLDR
The skeletal morphology of three nearly complete early juvenile avians from the renowned Early Cretaceous Yixian Formation of Liaoning Province in northeastern China are reported on, suggesting that fledging occurred very early in ontogeny, thus supporting a precocial or highly precocial strategy for enantiornithine hatchlings.
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