A Basal Dromaeosaurid and Size Evolution Preceding Avian Flight

@article{Turner2007ABD,
  title={A Basal Dromaeosaurid and Size Evolution Preceding Avian Flight},
  author={Alan H. Turner and Diego Pol and Julia A. Clarke and Gregory M. Erickson and Mark A. Norell},
  journal={Science},
  year={2007},
  volume={317},
  pages={1378 - 1381}
}
Fossil evidence for changes in dinosaurs near the lineage leading to birds and the origin of flight has been sparse. A dinosaur from Mongolia represents the basal divergence within Dromaeosauridae. The taxon's small body size and phylogenetic position imply that extreme miniaturization was ancestral for Paraves (the clade including Avialae, Troodontidae, and Dromaeosauridae), phylogenetically earlier than where flight evolution is strongly inferred. In contrast to the sustained small body sizes… Expand
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References

SHOWING 1-10 OF 99 REFERENCES
A new troodontid dinosaur from China with avian-like sleeping posture
TLDR
The discovery of a new troodontid taxon from the Early Cretaceous Yixian Formation of western Liaoning, China is reported, preserves several features that have been implicated in avialan origins and is preserved in the stereotypical sleeping or resting posture found in extant Aves. Expand
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 theExpand
New evidence concerning avian origins from the Late Cretaceous of Patagonia
TLDR
A theropod dinosaur from Patagonia is described, Unenlagia comahuensis gen. et sp. Expand
Fossil that fills a critical gap in avian evolution
TLDR
The new taxon, Apsaravis ukhaana, is the best-preserved specimen of a Mesozoic ornithurine bird discovered in over a century and provides data important for assessing morphological evolution across Avialae, with implications for the monophyly of Enantiornithes and Sauriurae. Expand
A basal troodontid from the Early Cretaceous of China
TLDR
The discovery of Sinovenator and the examination of character distributions along the maniraptoran lineage indicate that principal structural modifications toward avians were acquired in the early stages of manIRaptoran evolution. Expand
The earliest dromaeosaurid theropod from South America
TLDR
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. Expand
Largest bird from the Early Cretaceous and its implications for the earliest avian ecological diversification
TLDR
A new bird from the Early Cretaceous feathered-dinosaur-bearing continental deposits of Liaoning, northeast China is reported, which is not only larger than Archaeopteryx but is nearly twice as large as the basal dromaeosaur Microraptor. Expand
A gigantic bird-like dinosaur from the Late Cretaceous of China
TLDR
The gigantic Gigantoraptor shows many bird-like features absent in its smaller oviraptorosaurian relatives, unlike the evolutionary trend seen in many other coelurosaurian subgroups. Expand
Insight into the evolution of avian flight from a new clade of Early Cretaceous ornithurines from China and the morphology of Yixianornis grabaui
TLDR
The complete articulated holotype specimen of Yixianornis grabaui, from the Early Cretaceous Jiufotang Formation of Liaoning Province, in north‐eastern China, arguably the best‐preserved basal ornithurine specimen yet discovered, provides the earliest evidence consistent with the presence of extant avian tail feather fanning. Expand
The origin and early diversification of birds
Numerical cladistic analysis of 73 cranial and postcranial characters has resulted in a highly corroborated hypothesis describing the phylogenetic pattern of early avian evolution. Using “non-avianExpand
...
1
2
3
4
5
...