Zhanghenglong - Video Learning - WizScience.com




“”Zhanghenglong”” is an extinct genus of herbivorous hadrosauroid iguanodont dinosaur known from the Late Cretaceous Majiacun Formation in Xixia County of Henan Province, China. It contains a single species, “”Zhanghenglong yangchengensis””, represented by a disarticulated and partial cranium and postcranial skeleton.

In 2011, at Zhoujiagou in Henan the remains were uncovered of a euornithopod.

In 2014, the type species “Zhanghenglong yangchengensis” was named and described by Xing Hai, Wang Deyou, Han Fenglu, Corwin Sullivan, Ma Qingyu, He Yiming, David Hone, Yan Ronghao, Du Fuming and Xu Xing. The generic name combines the name of the first century Chinese scientist Zhang Heng with “long”, Mandarin for “dragon”. The specific name refers to Yangcheng, an administrative unit during the Eastern Zhou, partially coinciding with the present Henan.

The holotype, “XMDFEC V0013”, was found in the Majiacun Formation dating from the middle Santonian, about eighty-five million years old. It consists of a partial skull and lower jaw, including the right maxilla, the right jugal and the right dentary. The paratype is XMDFEC V0014, a partial skeleton lacking the skull, including five back vertebrae, ribs, a shoulder blade and the right ulna.

“Zhanghenglong” is probably a non-hadrosaurid hadrosauroid based on a series of plesiomorphic features present in this taxon. The new genus and species significantly differs from other known members of Hadrosauroidea in having two distinct autapomorphies and a unique combination of features. Despite the confluence of some plesiomorphic features typical of non-hadrosaurid hadrosauroids, “Zhanghenglong” possesses some derived characters seen in hadrosaurids, as well as two transitional features that are intermediate between the corresponding plesiomorphic and derived characters of hadrosauroids. This taxon may therefore represent a relatively derived non-hadrosaurid hadrosauroid, and is thought to be one of the closest relatives to Hadrosauridae.

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