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A pre-Archaeopteryx troodontid theropod from China with long feathers on the metatarsus
TLDR
The extensive feathering of this specimen, particularly the attachment of long pennaceous feathers to the pes, sheds new light on the early evolution of feathers and demonstrates the complex distribution of skeletal and integumentary features close to the dinosaur–bird transition.
The smallest known non-avian theropod dinosaur
TLDR
This is the first mature non-avian dinosaur to be found that is smaller than Archaeopteryx, and it eliminates the size disparity between the earliest birds and their closest non-Avian theropod relatives.
Cretaceous age for the feathered dinosaurs of Liaoning, China
TLDR
The results of this dating study indicate that the lower Yixian fossil horizons are not Jurassic but rather are at least 20 Myr younger, placing them within middle Early Cretaceous time.
A dromaeosaurid dinosaur with a filamentous integument from the Yixian Formation of China
TLDR
Phylogenetic analysis indicates that, among known theropods with integumentary filaments or feathers, Dromaeosauridae is the most bird-like, and is more closely related to birds than is Troodontidae.
An Archaeopteryx-like theropod from China and the origin of Avialae
TLDR
It is demonstrated that many features formerly regarded as being diagnostic of Avialae, including long and robust forelimbs, actually characterize the more inclusive group Paraves (composed of the avialans and the deinonychosaurs), which challenges the centrality of Archaeopteryx in the transition to birds.
A basal ceratopsian with transitional features from the Late Jurassic of northwestern China
TLDR
Character distributions along the marginocephalian lineage reveal that, compared to the bipedal Pachycephalosauria, the dominantly quadrupedal ceratopsians lost many marginocesphalian features and evolved their own characters early in their evolution.
The Earliest Pterodactyloid and the Origin of the Group
A therizinosauroid dinosaur with integumentary structures from China
TLDR
This new taxon from the Yixian Formation provides fresh evidence that therizinosauroids are nested within the coelurosaurian theropods, and supports the hypothesis that the filamentous integumentary structures may be homologous to the feathers of birds.
A Jurassic ceratosaur from China helps clarify avian digital homologies
TLDR
A new basal Ceratosaur from the Oxfordian stage of the Jurassic period of China is reported, representing the first known Asian ceratosaur and the only known beaked, herbivorous Jurassic theropod, and possesses a strongly reduced manual digit I, documenting a complex pattern of digital reduction within the Theropoda.
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
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