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An incomplete postcranial avian skeleton is described from the Lower Cretaceous Jingchuan Formation of Otog Banner of western Inner Mongolia and referred to a new species of Cathayornis,C. chabuensis sp.nov.This is the first report of a Cathayornis from outside Liaoning Province.The new discovery indicates that Cathayornis coexisted with Otogornis genghisi,and a more detailed comparison between these two enantiornithine genera shows that Otogornis represents a more primitive genus than Cathayornis.Our analyses further indicate that Cathayornis is an arboreal bird.The discovery of a Cathayornis from this region also confirms that the avian fossil-bearing Jingchuan Formation is comparable to the Jiufotang Formation of the upper Jehol Group in western Liaoning,and should be referred to the middle-late Early Cretaceous.
An incomplete postcranial avian skeleton is described from the Lower Cretaceous Jingchuan Formation of Otog Banner of western Inner Mongolia and referred to a new species of Cathayornis, C. chabuensis sp. Nov.This is the first report of a Cathayornis from outside Liaoning Province. new discovery indicates that Cathayornis coexisted with Otogornis genghisi, and a more detailed comparison between these two enantiornithine genera shows that Otogornis represents a more primitive genus than Cathayornis. These analyzes also indicate that Cathayornis is an arboreal bird. The discovery of a Cathayornis from this region also confirms that the avian fossil-bearing Jingchuan Formation is comparable to the Jiufotang Formation of the upper Jehol Group in western Liaoning, and should be referred to the middle-late Early Cretaceous.