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Comparative Osteology and Phylogenetic relationship of Edmontosaurus and Shantungosaurus (Dinosauria:Hadrosauridae) from the Upper Cretaceous of North America and East Asia

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Acta Geologica Sinica(English Edition) 2014年第6期88卷 1623-1652页

作者： XING Hai ZHAO Xijin WANG Kebai LI Dunjing CHEN Shuqing Jordan C.MALLON ZHANG Yanxia XU Xing College of Earth Sciences and Resources China University of Geosciences Paleobiology Canadian Museum of NatureOttawa K1P 6P4 Ontario Canada Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Zhucheng Dinosaur Museum Dinosaur Research Center of Zhucheng

The close affinity between Edmontosaurus and Shantungosaurus is corroborated on the basis of the following shared features：an occipital condyle deflected strongly posteroventrally; a posterodorsally reflected, lip-shaped oral margin of the premaxilla, with a deep, oval concavity at the anteromedial corner of the bone; a well-demarcated posterodorsal margin of the deeply excavated circumnarial fossa formed by a prominent arched ridge along the entire posterior half of the lateroventral border of the nasal; an anteroposteriorly broad jugal process of the postorbital; a strongly concave dorsal surface of the paired frontals; seven teeth per alveolus in the middle of the dentary tooth row; and a circular distal blade of the pubis that is much more expanded ventrally than dorsally. A revised phylogenetic analysis of Hadrosauroidea recovers a sister taxon relationship between Edmontosaurus and Shantungosaurus. Kerberosaurus is recovered as the sister taxon to the clade formed exclusively by these two genera. The clade Edmontosaurini could be defined as the least inclusive clade containing Kerberosaurus and Edmontosaurus, which is currently composed of the genera Kerberosaurus, Edmontosaurus, and Shantungosaurus. Zhuchengosaurus and Huaxiaosaurus,both from the Upper Cretaceous Wangshi Group in Zhucheng, are interpreted as junior synonyms of Shantungosaurus. Kundurosaurus is likewise considered a junior synonym of Kerberosaurus. The strict consensus tree together with biogeographic information indicates that the clade Edmontosaurini originated in Asia and subsequently dispersed into North America.

关键词： Hadrosaurinae Edmontosaurini Shantungosaurus Edmontosaurus sister taxon relationship

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