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Redescription of neoceratopsian dinosaur Archaeoceratops and early evolution of Neoceratopsia

100%

You H., Dodson P.

Acta Palaeontologica Polonica

2003

tom 48

nr 2

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.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Dodson P.

1 You H.

1 2003

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Redescription of neoceratopsian dinosaur Archaeoceratops and early evolution of Neoceratopsia