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A new troodontid theropod from the Late Cretaceous of central China, and the radiation of Asian troodontids

100%

Lu J., Xu L., Liu Y., Zhang X., Jia S., Ji Q.

Acta Palaeontologica Polonica

2010

tom 55

nr 3

381-388

A new troodontid dinosaur, Xixiasaurus henanensis gen. et sp. nov., from the Upper Cretaceous Majiacun Formation of the Xixia Basin, Henan Province, is erected, based on a partial skull. It is characterized by bearing 22 maxillary teeth, a distinct opening on the lateral surface of the base of nasal process of the premaxilla, the rostral end of the upper jaw forming a tapered U−shape, and the mandibular symphyseal region slightly inflected medially. Xixiasaurus is most closely related to the Mongolian Byronosaurus among troodontids. Byronosaurus, Urbacodon, and Xixiasaurus may form a new clade, suggesting an endemic radiation of troodontids across Asia, including multiple taxa without dental serrations. The discovery of Xixiasaurus in the Xixia Basin may imply that the Xixiasaurus−bearing Majiacun Formation is Campanian in age.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Ji Q.

1 Jia S.

1 Liu Y.

1 Lu J.

1 Xu L.

1 Zhang X.

1 2010

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A new troodontid theropod from the Late Cretaceous of central China, and the radiation of Asian troodontids