A new hadrosauroid dinosaur from the mid-Cretaceous of Liaoning, China

作者：You HL^*; Ji Q; Li JL; Li YX

来源：Acta Geologica Sinica, 2003, 77(2): 148-154.

DOI：10.1111/j.1755-6724.2003.tb00557.x

• Dinosauria
• Hadrosauroidea
• Hadrosauridae
• Sunjiawan Formation
• mid-Cretaceous
• Liaoning
• China

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.

• 出版日期2003-6
• 单位中国地质科学院