| A New Hadrosauroid Dinosaur from the Mid-Cretaceous of Liaoning, China |
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| 引用本文： | YOU Hailu,JI QiangInstitute of Geology,Chinese Academy of Geological Sciences,Baiwanzhuang Roa,Beijing,E-mail: hyou@sas.upenn.eduLI Jinglu and LI Yinxian Liaoning Paleontological Museum,Beipiao,Liaoning. A New Hadrosauroid Dinosaur from the Mid-Cretaceous of Liaoning, China[J]. 《地质学报》英文版, 2003, 77(2) |
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| 作者姓名： | YOU Hailu JI QiangInstitute of Geology Chinese Academy of Geological Sciences Baiwanzhuang Roa Beijing E-mail: hyou@sas.upenn.eduLI Jinglu and LI Yinxian Liaoning Paleontological Museum Beipiao Liaoning |
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| 作者单位： | YOU Hailu，JI QiangInstitute of Geology，Chinese Academy of Geological Sciences，Baiwanzhuang Road 26，Beijing 100037，E-mail: hyou@sas.upenn.eduLI Jinglu and LI Yinxian Liaoning Paleontological Museum，Beipiao，Liaoning 122100 |
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| 摘 要： | A new hadrosauroid dinosaur, Shuangmiaosaurus gilmorei gen. et sp. nov., is described based on a complete left maxilla with articulated premaxilla and lacrimal fragments, and a complete left dentary from the mid-Cretaceous Sunjiawan Formation of Beipiao, Liaoning, northeastern China. Cladistic analysis shows that Shuangmiaosaurus is a basal hadrosauroid, and comprises the sister taxon to Hadrosauridae. In both Shuangmiaosaurus and Hadrosauridae, the maxilla-jugal suture is butt-jointed, rather than finger-in-recess articulation as in other basal hadrosauroids. However, Shuangmiaosaurus does not possess such hadrosaurid synapomorphies as the diamond-shaped maxillary crowns with reduced primary ridges and reduced marginal denticles.
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A New Hadrosauroid Dinosaur from the Mid-Cretaceous of Liaoning, China |
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| YOU Hailu,JI QiangInstitute of Geology,Chinese Academy of Geological Sciences,Baiwanzhuang Roa,Beijing,E-mail: hyou@sas.upenn.eduLI Jinglu and LI Yinxian Liaoning Paleontological Museum,Beipiao,Liaoning. A New Hadrosauroid Dinosaur from the Mid-Cretaceous of Liaoning, China[J]. Acta Geologica Sinica (English Edition), 2003, 77(2) |
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| Authors: | YOU Hailu JI QiangInstitute of Geology Chinese Academy of Geological Sciences Baiwanzhuang Roa Beijing E-mail: hyou@sas.upenn.eduLI Jinglu LI Yinxian Liaoning Paleontological Museum Beipiao Liaoning |
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| Abstract: | A new hadrosauroid dinosaur, Shuangmiaosaurus gilmorei gen. et sp. nov., is described based on a complete left maxilla with articulated premaxilla and lacrimal fragments, and a complete left dentary from the mid-Cretaceous Sunjiawan Formation of Beipiao, Liaoning, northeastern China. Cladistic analysis shows that Shuangmiaosaurus is a basal hadrosauroid, and comprises the sister taxon to Hadrosauridae. In both Shuangmiaosaurus and Hadrosauridae, the maxilla-jugal suture is butt-jointed, rather than finger-in-recess articulation as in other basal hadrosauroids. However, Shuangmiaosaurus does not possess such hadrosaurid synapomorphies as the diamond-shaped maxillary crowns with reduced primary ridges and reduced marginal denticles. |
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| Keywords: | Dinosauria Hadrosauroidea Hadrosauridae Sunjiawan Formation mid-Cretaceous Liaoning China. |
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