Redescription of neoceratopsian dinosaur Archaeoceratops and early evolution of Neoceratopsia

• Autorzy: You H , Dodson P.
• Języki publikacji: EN

Abstrakty

EN

Archaeoceratops oshimai Dong and Azuma, 1997 is a basal neoceratopsian from the late Early Cretaceous of Mazongshan area, Gansu Province, northwest China. Here we provide a detailed description on Archaeoceratops oshimai based on both the holotype, which consists of a well preserved, nearly complete skull, partial vertebral column, and partial pelvis, and the paratype, which consists of a partial vertebral column including a nearly complete tail, a partial pelvis, fragmentary hind limb bones, and a complete pes. Cladistic analysis shows that Archaeoceratopsis the sister group to all currently known Late Cretaceous Neoceratopsia, and Late Cretaceous Neoceratopsia diverged into two clades: the Asian Protoceratopsidae and the North American Ceratopsoidea, indicating a dual evolution for the two major groups of horned dinosaurs in two landmasses of Late Cretaceous. A suite of derived features characterizes Ceratopsoidea, such as a round−shaped external naris, a long caudolateral process of the rostral bone, and ventrally curved premaxillary ventral edge.

Słowa kluczowe

EN

Cretaceous; Archaeoceratops; China; Dinosauria; neoceratopsian dinosaur; Mazongshan area; evolution; dinosaur; Gansu Province; Neoceratopsia; Archaeoceratops oshimai; paleontology

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2003
• Tom: 48
• Numer: 2
• Opis fizyczny: p.261-272,fig.

Twórcy

autor

You H

• Chinese Academy of Geological Sciences, Beijing 100037, P.R.China

autor

Dodson P.

Bibliografia

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