Abstract: During the early 1980 ' s, a team composed of the members from the Institute of Geology, Chinese Academy of Geological Sciences and Institute of Geology, Bureau of Geology and Mineral Resources of Gansu resurveyed the terrestrial Permian and Triassic deposites of Qilian Mountain area. A skull of dicynodont was collected from Lugou, NE 30km of Sunan by the 2nd author of the present paper. On the basis of its large size, a single pair of the maxillary tusks in the upper jaws, the postorbital tending to overlap the parietal posterior to the pineal foramen, the septomaxilla merged smoothly with the dorsal surface of the snout, etc., the specimen is referable to genus Dicynodon, and represents a new species.

摘要： 记述了甘肃肃南县鲁沟上二叠统肃南组的二齿兽一新种——Dicynodon sunanensis sp. nov.。它以额骨与前颌骨相连，在接触处具一深的凹坑，和向前延伸的位于前颌骨中线上的一浅沟;左右鼻骨不在中线相遇;泪骨向前延伸超过前额骨等特征区别于Dicynodon的其他种。它与新疆锅底坑组的Dicynodon bogdaensis关系密切。祁连山地区二叠系、三叠系的研究对比表明:1)肃南组的命名剖面——大青沟剖面只包括肃南组下部，该组由上下两部分组成，这在羊露河剖面和鲁沟剖面中可以得到证实。2)过去