Abstract: Yonghesuchus sangbiensis, a new genus and species of the Archosauriformes, is erected on the basis of its peculiar cranial features. This taxon represents the first record of tetrapods from the Late Triassic terrestrial deposits of China. Its discovery is significant not only to our study on the phylogeny of the Archosauriformes but also to our understanding of the evolution of the Triassic terrestrial vertebrate faunae in China. The presence of pterygoid teeth may exclude the new form from the Archosauria, and the apomorphic position of the foramen for the internal carotid artery indicates that the new form appears to be phylogenetically closer to the Archosauria than are Turfanosuchus and the Proterochampsidae. Comparisons with these taxa suggest that the Y. sangbiensis-bearing Tongchuan Formation is probably of early Late Triassic age.

摘要： 初步研究了山西省永和县桑壁镇铜川组二段产出的两件初龙形类化石标本( IVPP V12378 ,V 12379) ,在此基础上建立了一新属新种———桑壁永和鳄(Yonghesuchus sangbiensis gen. et sp. nov. ) 。 它以下列共存的衍生特征区别于其他初龙形类(archosauriforms):1) 吻部前端尖削;2)眶前窝前部具一凹陷;3) 眶前窝与外鼻孔间宽;4) 眶后骨下降突的后2/ 3 宽且深凹;5) 基蝶骨腹面有两个凹陷;6) 齿骨后背突相当长;7) 关节骨