| A Nwe Hadrosauroid Dinosaur from the Mid—Cretaceous of Liaoning,China |
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| 引用本文： | YOUHailu ЛQiang LIJinalu LIYinxian. A Nwe Hadrosauroid Dinosaur from the Mid—Cretaceous of Liaoning,China[J]. 《地质学报》英文版, 2003, 77(2): 148-154. DOI: 10.1111/j.1755-6724.2003.tb00557.x |
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| 作者姓名： | YOUHailu ЛQiang LIJinalu LIYinxian |
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| 作者单位： | [1]InstituteofGeology,ChineseAcademyofGeologicalSciences,BaiwanzhuangRoad26,Beijing100037 [2]LiaoningPaleontologicalMuseum,Beiqiao,Liaoning122100 |
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| 摘 要： | A new hadrosauroid dinosaur,Shuangmiaosaurus gilmorei gen.et sp.nov,is descuibed 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.Chadistic analysis shows that Shuangmiaosaurus is a basal hadrosauroid,and comprises the sister taxon to Hadrosauridae.In both Shuangmiaosqurus and Hadrosaurids.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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| 关 键 词： | 鸭嘴龙 中白垩纪 辽宁 中国 上颌骨 前额骨 牙齿 恐龙 |
A New Hadrosauroid Dinosaur from the Mid‐Cretaceous of Liaoning,China |
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| YOU Hailu,JI Qiang,LI Jinglu,LI Yinxian. A New Hadrosauroid Dinosaur from the Mid‐Cretaceous of Liaoning,China[J]. Acta Geologica Sinica (English Edition), 2003, 77(2): 148-154. DOI: 10.1111/j.1755-6724.2003.tb00557.x |
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| Authors: | YOU Hailu JI Qiang LI Jinglu LI Yinxian |
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| Abstract: | 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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