A pygostyle from a non-avian theropod

  title={A pygostyle from a non-avian theropod},
  author={Rinchen Barsbold and Philip J. Currie and Nathan P Myhrvold and Halszka Osm{\'o}lska and Khishigjaw Tsogtbaatar and Mahito Watabe},
The independent evolution of a bird-like tail has been discovered in an oviraptorosaur. 
Therizinosauroidea) from the Lower Cretaceous Yixian Formation
Pygostyle was previously considered as a unique structure of ornithothoracine birds, used to maneuver tail feathers. A similar structure from an oviraptorosaurian dinosaur was considered functionally
A new oviraptorosaur [Dinosauria, Theropoda] from Mongolia: the first dinosaur with a pygostyle
The first known dinosaur with a pygostyle, the structure known so far only in birds, is presented, and N. gobiensis is assigned within the Oviraptorosauria based on the following characters: pneumatized caudal vertebrae, posteriorly concave ischium, and deep cervicodorsal hypapophyses.
Pygostyle‐like Structure from Beipiaosaurus (Theropoda, Therizinosauroidea) from the Lower Cretaceous Yixian Formation of Liaoning, China
Abstract  Pygostyle was previously considered as a unique structure of ornithothoracine birds, used to maneuver tail feathers. A similar structure from an oviraptorosaurian dinosaur was considered
The first oviraptorosaur (Dinosauria: Theropoda) bonebed: evidence of gregarious behaviour in a maniraptoran theropod
The Avimimus bonebed is the first evidence of gregarious behaviour in oviraptorosaurs, and highlights a potential trend of increasing gregiousness in dinosaurs towards the end of the Mesozoic.
An unusual bird (Theropoda, Avialae) from the Early Cretaceous of Japan suggests complex evolutionary history of basal birds
This first record of the Early Cretaceous non-ornithothoracine avialan outside of the Jehol Biota is presented and increases the understanding of their diversity and distribution during the time and provides evidence that the evolutionary history of early birds was more complex than previously realised.
New Oviraptorid Dinosaur (Dinosauria: Oviraptorosauria) from the Nemegt Formation of Southwestern Mongolia
Nernegtia barsboldi gen. et sp. nov. here described is a new oviraptorid dinosaur from the Late Cretaceous (mid-Maastrichtian) Nemegt Formation of southwestern Mongolia. It differs from other
New information on Cretaceous troodontids (Dinosauria, Theropoda) from the People's Republic of China
Troodontid specimens were recovered from three localities in China by the Sino-Canadian expeditions between 1987 and 1990. These include a Lower Cretaceous form (Sinornithoides youngi), which is the
An Oviraptorosaur Adult-Egg Association from the Cretaceous of Jiangxi Province, China
Histological tissues and open neurocentral sutures indicate that this reproductively active individual was several years old but still growing at the time of death, a pattern observed in other non-avian maniraptorans.
A New Large-Bodied Oviraptorosaurian Theropod Dinosaur from the Latest Cretaceous of Western North America
Phylogenetic analysis indicates that Anzu is most closely related to Caenagnathus collinsi, a taxon that is definitively known only from a mandible from the Campanian Dinosaur Park Formation of Alberta, and the problematic oviraptorosaurs Microvenator and Gigantoraptor are recovered as basal caenagnaths, as has previously been suggested.
This work serves as a compendium of anatomical resources upon which a companion phylogenetic analysis of Aves and related Theropoda (Avialae) was based and summarized, to the extent feasible, previously published characters for which inclusion in the present work was judged to be unreliable or lacking sufficient clarity.


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.
IV. On the vertebral chain of birds
  • W. K. Parker
  • Biology
    Proceedings of the Royal Society of London
  • 1888
It seems to me to he probable that the Amphibian stock from which birds arose—becoming Reptiles in their ascent, but spurning that intermediate stage—were long, eel-like forms, not dissimilar to Amphiuma and Menobranchus among the existing Urodeles.
On Chirostenotes, a Late Cretaceous oviraptorosaur (Dinosauria: Theropoda) from western North America
ABSTRACT A previously unrecognized partial skeleton of Chirostenotes pergracilis Gilmore, 1924 from the Upper Cretaceous Horseshoe Canyon Formation of Alberta (Canada) includes parts of the skull,
Osteology and relationships of Chirostenotes pergracilis (Saurischia, Theropoda) from the Judith River (Oldman) Formation of Alberta, Canada
A partial skeleton of a small theropod found in the Judith River Formation of Dinosaur Provincial Park (Alberta) shows that Chirostenotes pergracilis is the same animal as "Macrophalangia canadensis"
New caenagnathid (Dinosauria: Theropoda) specimens from the Upper Cretaceous of North America and Asia
The two jaws from the Bissekty Formation are the first oviraptorosaurian jaws described from Uzbekistan and represent a new genus and species anatomically closer to Caenagnathus than to central Asian forms like Oviraptor, Conchoraptor and Ingenia.