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Some new materials of the vertebrates collected from the Mazongshan Area and Turpan Basin are reported in this volume. The remains were found by the Sino-Japanese Silk Road Dinosaur Project (SJDP) during 1992-993. The Chunichi-Shinbun (Central Part News Paper Company), in Nagoya of Japan provided financial support for the expedition. The two year expeditions were extremely successful, with significant discoveries made from the Mazongshan Area of western Gansu and Turpan Basin of Xinjiang, Many new genera and species of turtles, crocodiles dinosaurs, and mammals are named based on the material collected in these expeditions, among which six new genera and species of dinosaurs are described in this study. These new taxa are Siluosaurus zhangqiani (Hypsilophodontidae), Probactrosaurus mazongshanensis (Iguanodontidae), Psittacosaurus mazongshanensis (Psittacosauridae), Archaeoceratops oshimai (Neoceratopsia), and Nanshiungosaurus bohlini (Segnosauria) from the Mazongshan Area; the Hudiesaurus sinojapanorum (Mamenchisauridae) from the Turpan Basin. A new family, Archaeoceratopsidae, , is proposed based on the type genus Archaeoceratops that is named after a nearly complete skull and associated skeleton. It is morphologically the most primitive, and stratigraphically the oldest, neoceratopsian dinosaur according to our study. Our analysis suggests that psittacosaurids and archaeoceratosids are probably sister grous, derived from the same group of ornithischian dinosaurs in the Late Jurassic age.
1. Introduction
2. Vertebrates of the Mazongshan Area, Gansu Province
3. Vertebrates of the Turpan Basin, the Xinjiang Uygur Autonomous
Region, China
4. Appendix
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