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Heyuannia huangi Lu, 2003 from the Late Cretaceous of Southern China is described in detail. The revised diagnosis of Heyuannia huangi includes the following characters: quadratojugal articular surface of the quadrate groove-lke, the quadrate diverticulum entering the quadrate anterolaterally, metacarpal I wrapped around metacarpal II proximally, pneumatic foramina present on the neural arches and ribs of cervical vertebrae, the angle between the scapula and coracoid approximately 145º, the ratio of coracoid length to scapular length approximately 0.35, the pubis as long as ischium, and the ratio of femur length to tibia length 0.8. Two new oviraptorids from the nanxiong Basin are also described. A phylogenetic analysis was carried out in two parts. The first phylogenetic analysis is to test the systematic position of Oviraptorosauria among ceolurosaurid dinosaurs. This analysis shows that Oviraptorosauria form a monophyletic group. Incisivosaurus gauthieri is the most basal oviraptorosaur and Caudipteryx is the second most primitive form. Alvarezsauridae is a sister group to TO (Therizinosauroidea and oviraptorosauria). Within this more inclusive analysis (among Ceolurosauria), all the derived forms of Oviraptorosauria (excluding the Primitive forms such as Incisivosaurus gauthieri and Caudipteryx zoui) form an unresolved polytomy. The second analysis is to determine the interrelation-ships among oviraptorosaurs. This less inclusive analysis (only a few groups of Ceolurosauria were employed for analysis) allows better resolution within Oviraptorosauria. The analysis shows that all oviraptorosaurs form a monophyletic group, Incisivosaurus gauthieri is the most basal oviraptotosaur, Caudipteryx zoui is the second most primitive form and Avimimus portentosus is basal to the derived oviraptorosaurs. The two new taxa from Nanxiong Basin are not nested within same clade.Specimen BPV-112 may be the first caenagnathid oviraptorosaur found from southern China.

1.Preface
2.Abstract
3.Introduction
4.Geology of the Heyuan Basin
5.Osteology of Heyuannia huangi
(1)Systematic Paleontology
(2)Comparison and Discussion
6.Two new Oviraptorids from Nanxiong Basin
(1)The Oviraptorid Material from Luyuan of Shixing County
(2)An Oviraptorid Dinosaur from Xincheng Area of Nanxiong City
7.Phylogenetic Analysis of Oviraptorosauria
(1)Materials and Methods
(2)The Phylogenetic Analysis of Oviraptorosaurs Based on the Theropod Working group Matrix
(3)The Phylogenetic Analysis of Oviraptorosaurs based on Modified Matrix
(4)Conclusion
(5)The Status of Oviraptorosauria Among Coelurosauria
8.Geographic and Stratigraphic Record of the Oviraptorosauria
9.Summary of Conclusion
10.Acknowledgements
11.Appendix A
12.Appendix B
13.Plate Explanation

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