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A Review of Dromaeosaurid Systematics and Paravian Phylogeny
This study provides the most detailed and comprehensive phylogenetic analysis of paravians to date in order to explore the phylogenetic history of dromaeosaurid taxa and reviews and revises the membership of DromaeOSauridae and provides an apomorphy-based diagnosis for all valid taxa.
A Complete Skeleton of a Late Triassic Saurischian and the Early Evolution of Dinosaurs
- S. Nesbitt, N. Smith, R. Irmis, A. Turner, Alex Downs, M. Norell
- Environmental Science, GeographyScience
- 11 December 2009
A new theropod dinosaur from New Mexico is a representative of the early North American diversification and reveals a mosaic of plesiomorphic and derived features that clarify early saurischian dinosaur evolution and provide evidence for the antiquity of novel avian character systems including skeletal pneumaticity.
Two feathered dinosaurs from northeastern China
Two theropods from the Upper Jurassic/Lower Cretaceous Chaomidianzi Formation of Liaoning province, China are described, which represent stages in the evolution of birds from feathered, ground-living, bipedal dinosaurs.
Gradual Assembly of Avian Body Plan Culminated in Rapid Rates of Evolution across the Dinosaur-Bird Transition
A basal troodontid from the Early Cretaceous of China
- Xing（徐星） Xu, M. Norell, Xiaolin Wang, P. Makovicky, Xiaocong Wu
- Biology, Environmental ScienceNature
- 14 February 2002
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.
A Basal Dromaeosaurid and Size Evolution Preceding Avian Flight
- A. Turner, D. Pol, J. Clarke, G. Erickson, M. Norell
- Biology, Environmental ScienceScience
- 7 September 2007
Change in theropod body size leading to flight's origin was not unidirectional, and the two dinosaurian lineages most closely related to birds, dromaeosaurids and troodontids, underwent four independent events of gigantism, and in some lineages size increased by nearly three orders of magnitude.
New Specimens of Microraptor zhaoianus (Theropoda: Dromaeosauridae) from Northeastern China
New specimens of the diminutive theropod dinosaur Microraptor zhaoianus are described, found to be the sister taxon to other dromaeosaurs and apparently small size is primitive for Deinonychosauria, which has implications for bird origins.
Morphology of the Late Cretaceous Crocodylomorph Shamosuchus djadochtaensis and a Discussion of Neosuchian Phylogeny as Related to the Origin of Eusuchia
A review of all the available evidence on the diversity of advanced neosuchians suggests this group achieved a worldwide distribution and a remarkable morphological diversity, pushing their evolutionary origins back to the Jurassic.
A basal tyrannosauroid dinosaur from the Late Jurassic of China
The tyrannosauroid fossil record is mainly restricted to Cretaceous sediments of Laurasia, although some very fragmentary Jurassic specimens have been referred to this group. Here we report a new…
South America's earliest rodent and recognition of a new interval of mammalian evolution
THE mid-Cenozoic immigration of rodents and primates to South America (when it was widely isolated by oceans) represents a pre-eminent problem in the biogeographical history of placental mammals. The…