A dromaeosaurid dinosaur with a filamentous integument from the Yixian Formation of China

Xu, Xing; Wang, Xiaolin; Wu, Xiaochun

doi:10.1038/45769

Cited by 263 publications

(250 citation statements)

References 15 publications

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“…The maxilla is weakly sculptured by small pits on the lateral surface of the bone at the anteroventral corner, a feature also seen in other Liaoning dromaeosaurids (Xu et al 1999;Xu 2002) (Barsbold & Osmolska 1999;Norell et al 2006). As in other Liaoning dromaeosaurids, basal troodontids and basal avialans (Xu 2002), the promaxillary fenestra is enlarged and close in size to the maxillary fenestra.…”

Section: Systematic Palaeontologymentioning

confidence: 76%

“…As one of the most bird-like groups, they share numerous derived similarities with birds, including small size, a feature considered critical for the origin of avian flight (Novas & Puerta 1997;Sereno 1999;Xu et al 2000;Xu & Norell 2004;Turner et al 2007b). Basal dromaeosaurids are all small in size and this is particularly true for Liaoning dromaeosaurids (Xu et al 1999(Xu et al , 2000(Xu et al , 2003Hwang et al 2002;Xu & Wang 2004;Xu 2006). So far, five dromaeosaurid taxa have been reported from the Early Cretaceous Jehol Group of western Liaoning, China, all being shorter than 150 cm in total body length.…”

Section: Introductionmentioning

confidence: 99%

“…Most phylogenetic analyses posit the Dromaeosauridae as the sister taxon to the Troodontidae, forming a monophyletic Deinonychosauria, which in turn is the sister taxon to the Avialae (Ostrom 1969;Gauthier 1986;Sereno 1999;Norell et al 2001;Xu 2002;Senter et al 2004;Senter 2007;Turner et al 2007b), although some analyses suggest that the dromaeosaurids themselves are the closest relatives of birds (Xu et al 1999;Holtz 2000). As one of the most bird-like groups, they share numerous derived similarities with birds, including small size, a feature considered critical for the origin of avian flight (Novas & Puerta 1997;Sereno 1999;Xu et al 2000;Xu & Norell 2004;Turner et al 2007b).…”

Section: Introductionmentioning

confidence: 99%

“…So far, five dromaeosaurid taxa have been reported from the Early Cretaceous Jehol Group of western Liaoning, China, all being shorter than 150 cm in total body length. These taxa are Sinornithosaurus millenii from the Yixian Formation (Xu et al 1999), Sinornithosaurus haoiana from the Yixian Formation (Liu et al 2004), Microraptor zhaoianus from the Jiufotang Formation (Xu et al 2000), Microraptor gui from the Jiufotang Formation (Xu et al 2003), and Graciliraptor lujiatunen from the Yixian Formation (Xu & Wang 2004). They share several unique features and are suggested to form a monophyletic group at the base of the dromaeosaurid phylogenetic tree (Xu 2002;Senter et al 2004;Xu & Wang 2004;Turner et al 2007b).…”

Section: Introductionmentioning

confidence: 99%

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A short-armed dromaeosaurid from the Jehol Group of China with implications for early dromaeosaurid evolution

Zheng¹,

You

et al. 2009

Proc. R. Soc. B.

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Recent discoveries of basal dromaeosaurids from the Early Cretaceous Jiufotang and Yixian formations of Liaoning, China, add significant new information about the transition from non-avian dinosaurs to avians. Here we report on a new dromaeosaurid, Tianyuraptor ostromi gen. et sp. nov., from the Early Cretaceous Yixian Formation of western Liaoning, China, based on a nearly complete skeleton. Tianyuraptor possesses several features only seen in other Liaoning dromaeosaurids, although to a less developed degree, and it also exhibits features unknown in Laurasian dromaeosaurids but present in the Gondwanan dromaeosaurids and basal avialans, thus reducing the morphological gap between these groups. Tianyuraptor possesses a comparatively small furcula and proportionally short forelimbs. This lies in stark contrast to the possible capacity for flight in the microraptorines, which have proportionally long and robust forelimbs and large furculae. The presence of such striking differences between the Early Cretaceous Jehol dromaeosaurids reveals a great diversity in morphology, locomotion and ecology early in dromaeosaurid evolution.

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Section: Systematic Palaeontologymentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A short-armed dromaeosaurid from the Jehol Group of China with implications for early dromaeosaurid evolution

Zheng¹,

You

et al. 2009

Proc. R. Soc. B.

Self Cite

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“…Again in parallel, it became difficult to decide where to begin and where to cease utilizing NAA nomenclature. Should NAA terminology apply to Archaeopteryx but not to Sinornithosaurus or Bambiraptor, even though the latter possess numerous avian anatomical features (Xu et al, 1999Burnham et al, 2000;Xu and Wu, 2001;Burnham, 2004) that meet definitions established in the NAA? If it applies to Sinornithosaurus and Bambiraptor, why not the only slightly less bird-like Deinonychus (Ostrom, 1969(Ostrom, ,1976Gishlick, 2001)?…”

mentioning

confidence: 99%

Confusing dinosaurs with mammals: Tetrapod phylogenetics and anatomical terminology in the world of homology

Harris

2004

Anat. Rec.

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At present, three different systems of anatomical nomenclature are available to researchers describing new tetrapod taxa: a nonstandardized traditional system erected in part by Sir Richard Owen and subsequently elaborated by Alfred Romer; a standardized system created for avians, the Nomina Anatomica Avium (NAA); and a standardized system for extant (crown-group) mammals, the Nomina Anatomica Veterinaria (NAV). Conserved homologous structures widely distributed within the Tetrapoda are often granted different names in each system. The recent shift toward a phylogenetic system based on homology requires a concomitant shift toward a single nomenclatural system also based on both evolutionary and functional morphological homology. Standardized terms employed in the NAA and NAV should be perpetuated as far as possible basally in their respective phylogenies. Thus, NAA terms apply to nonavian archosaurs (or even all diapsids) and NAV terms apply to noncrowngroup mammals and more basal synapsids. Taxa equally distant from both avians and crown-group mammals may maintain the traditional nonstandardized terminology until a universal anatomical nomenclature for all tetrapods is constructed.

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High‐precision U‐Pb geochronology of the Jurassic Yanliao Biota from Jianchang (western Liaoning Province, China): Age constraints on the rise of feathered dinosaurs and eutherian mammals

Chu

Ramezani

et al. 2016

Geochem Geophys Geosyst

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The Yanliao Biota of northeastern China comprises the oldest feathered dinosaurs, transitional pterosaurs, as well as the earliest eutherian mammals, multituberculate mammals, and new euharamiyidan species that are key elements of the Mesozoic biotic record. Recent discovery of the Yanliao Biota in the Daxishan section near the town of Linglongta, Jianchang County in western Liaoning Province have greatly enhanced our knowledge of the transition from dinosaurs to birds, primitive to derived pterosaurs, and the early evolution of mammals. Nevertheless, fundamental questions regarding the correlation of fossilbearing strata, rates of dinosaur and mammalian evolution, and their relationship to environmental change in deep time remain unresolved due to the paucity of precise and accurate temporal constraints. These limitations underscore the importance of placing the rich fossil record of Jianchang within a high-resolution chronostratigraphic framework that has thus far been hampered by the relatively low precision of in situ radioisotopic dating techniques. Here we present high-precision U-Pb zircon geochronology by the chemical abrasion isotope dilution thermal ionization mass spectrometry (CA-ID-TIMS) from three interstratified ash beds previously dated by secondary-ion mass spectrometry (SIMS) technique. The results constrain the key fossil horizons of the Daxishan section to an interval spanning 160.89 to 160.25 Ma with 2r analytical uncertainties that range from 646 to 669 kyr. These data place the Yanliao Biota from Jianchang in the Oxfordian Stage of the Late Jurassic, and mark the Daxishan section as the site of Earth's oldest precisely dated feathered dinosaurs and eutherian mammals.

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A dromaeosaurid dinosaur with a filamentous integument from the Yixian Formation of China

Cited by 263 publications

References 15 publications

A short-armed dromaeosaurid from the Jehol Group of China with implications for early dromaeosaurid evolution

A short-armed dromaeosaurid from the Jehol Group of China with implications for early dromaeosaurid evolution

Confusing dinosaurs with mammals: Tetrapod phylogenetics and anatomical terminology in the world of homology

High‐precision U‐Pb geochronology of the Jurassic Yanliao Biota from Jianchang (western Liaoning Province, China): Age constraints on the rise of feathered dinosaurs and eutherian mammals

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