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Citation for Study 13143

Citation title: "A longirostrine tyrannosauroid from the Early Cretaceous of China.".

Study name: "A longirostrine tyrannosauroid from the Early Cretaceous of China.".

This study is part of submission 13143 (Status: Published).

Citation

Daqing L., Norell M.A., Gao K., Smith N.D., & Makovicky P.J. 2010. A longirostrine tyrannosauroid from the Early Cretaceous of China. Proceedings of the Royal Society of London, Biological Sciences, 277: 183-190.

Authors

• Daqing L.
• Norell M.A.
• Gao K.
• Smith N.D.
• Makovicky P.J.

Abstract

The fossil record of tyrannosauroid theropods is marked by a substantial temporal and morphological gap between small-bodied, Barremian taxa, and extremely large-bodied taxa from the latest Cretaceous. Here we describe a new tyrannosauroid, Xiongguanlong baimoensis n. gen. et sp., from the Aptian-Albian Xinminpu Group of western China that represents a phylogenetic, morphological, and temporal link between these disjunct portions of tyrannosauroid evolutionary history. Xiongguanlong is recovered in our phylogenetic analysis as the sister taxon to Tyrannosauridae plus Appalachiosaurus, and marks the appearance of several tyrannosaurid hallmark features, including a sharp parietal sagittal crest, a boxy basicranium, a quadratojugal with a flaring dorsal process and a flexed caudal edge, premaxillary teeth bearing a median lingual ridge, and an expanded axial neural spine surmounted by distinct processes at its corners. Xiongguanlong is characterized by a narrow and elongate muzzle resembling that of Alioramus. The slender, unornamented nasals of Xiongguanlong are inconsistent with recent hypotheses of correlated progression in tyrannosauroid feeding mechanics, and suggest more complex patterns of character evolution in the integration of feeding adaptations in tyrannosaurids. Body mass estimates for the full-grown holotype specimen of Xiongguanlong fall between those of Late Cretaceous tyrannosaurids and Barremian tyrannosauroids, suggesting that the trend of increasing body size observed in North American Late Cretaceous Tyrannosauridae may extend through the Cretaceous history of Tyrannosauroidea though further phylogenetic work is required to corroborate this.

Keywords

China; Cretaceous; Dinosauria; Tyrannosauroidea; Xinminpu Group; Xiongguanlong baimoensis

External links

• DOI: 10.1098/rspb.2009.0249
• PMID: 19386654
• Other URL: http://graemetlloyd.com/matr.html

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S13143
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref21106,
  	 author = {Li  Daqing and Mark A Norell and Ke-Qin  Gao and Nathan D. Smith and Peter J Makovicky},
  	 title = {A longirostrine tyrannosauroid from the Early Cretaceous of China.},
  	 year = {2010},
  	 keywords = {China; Cretaceous; Dinosauria; Tyrannosauroidea; Xinminpu Group; Xiongguanlong baimoensis},
  	 doi = {10.1098/rspb.2009.0249},
  	 url = {http://graemetlloyd.com/matr.html},
  	 pmid = {19386654},
  	 journal = {Proceedings of the Royal Society of London, Biological Sciences},
  	 volume = {277},
  	 number = {},
  	 pages = {183--190},
  	 abstract = {The fossil record of tyrannosauroid theropods is marked by a substantial temporal and morphological gap between small-bodied, Barremian taxa, and extremely large-bodied taxa from the latest Cretaceous. Here we describe a new tyrannosauroid, Xiongguanlong baimoensis n. gen. et sp., from the Aptian-Albian Xinminpu Group of western China that represents a phylogenetic, morphological, and temporal link between these disjunct portions of tyrannosauroid evolutionary history. Xiongguanlong is recovered in our phylogenetic analysis as the sister taxon to Tyrannosauridae plus Appalachiosaurus, and marks the appearance of several tyrannosaurid hallmark features, including a sharp parietal sagittal crest, a boxy basicranium, a quadratojugal with a flaring dorsal process and a flexed caudal edge, premaxillary teeth bearing a median lingual ridge, and an expanded axial neural spine surmounted by distinct processes at its corners. Xiongguanlong is characterized by a narrow and elongate muzzle resembling that of Alioramus. The slender, unornamented nasals of Xiongguanlong are inconsistent with recent hypotheses of correlated progression in tyrannosauroid feeding mechanics, and suggest more complex patterns of character evolution in the integration of feeding adaptations in tyrannosaurids. Body mass estimates for the full-grown holotype specimen of Xiongguanlong fall between those of Late Cretaceous tyrannosaurids and Barremian tyrannosauroids, suggesting that the trend of increasing body size observed in North American Late Cretaceous Tyrannosauridae may extend through the Cretaceous history of Tyrannosauroidea though further phylogenetic work is required to corroborate this.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 21106
  AU  - Daqing,Li 
  AU  - Norell,Mark A
  AU  - Gao,Ke-Qin 
  AU  - Smith,Nathan D.
  AU  - Makovicky,Peter J
  T1  - A longirostrine tyrannosauroid from the Early Cretaceous of China.
  PY  - 2010
  KW  - China; Cretaceous; Dinosauria; Tyrannosauroidea; Xinminpu Group; Xiongguanlong baimoensis
  UR  - http://graemetlloyd.com/matr.html
  N2  - The fossil record of tyrannosauroid theropods is marked by a substantial temporal and morphological gap between small-bodied, Barremian taxa, and extremely large-bodied taxa from the latest Cretaceous. Here we describe a new tyrannosauroid, Xiongguanlong baimoensis n. gen. et sp., from the Aptian-Albian Xinminpu Group of western China that represents a phylogenetic, morphological, and temporal link between these disjunct portions of tyrannosauroid evolutionary history. Xiongguanlong is recovered in our phylogenetic analysis as the sister taxon to Tyrannosauridae plus Appalachiosaurus, and marks the appearance of several tyrannosaurid hallmark features, including a sharp parietal sagittal crest, a boxy basicranium, a quadratojugal with a flaring dorsal process and a flexed caudal edge, premaxillary teeth bearing a median lingual ridge, and an expanded axial neural spine surmounted by distinct processes at its corners. Xiongguanlong is characterized by a narrow and elongate muzzle resembling that of Alioramus. The slender, unornamented nasals of Xiongguanlong are inconsistent with recent hypotheses of correlated progression in tyrannosauroid feeding mechanics, and suggest more complex patterns of character evolution in the integration of feeding adaptations in tyrannosaurids. Body mass estimates for the full-grown holotype specimen of Xiongguanlong fall between those of Late Cretaceous tyrannosaurids and Barremian tyrannosauroids, suggesting that the trend of increasing body size observed in North American Late Cretaceous Tyrannosauridae may extend through the Cretaceous history of Tyrannosauroidea though further phylogenetic work is required to corroborate this.
  L3  - 10.1098/rspb.2009.0249
  JF  - Proceedings of the Royal Society of London, Biological Sciences
  VL  - 277
  IS  - 
  SP  - 183
  EP  - 190
  ER  -