记甘肃东乡汪集的板齿犀和三趾马化石

NOTES ON PARELASMOTHERIUM AND HIPPARION FOSSILS FROM WANGJI, DONGXIANG, GANSU

汪集的板齿犀化石和周明镇1958年所定的“Sinotherium”simplum，在大小、齿冠高度和构造上都很接近，应归为同种。它们和Sinotherium的属型种，S.lagrelii,有明显的差别，而和Killgus于1923年所定的Parelasmotheriumschansiense更为接近。笔者认为Parelasmotherium属应予恢复。“Sinotherium”simplum应该改称为Parelasmotheriumsimplum。汪集新发现的Hippariondongxiangense是我国已知三趾马中牙齿尺寸最小的。汪集含上述化石的地点的地质时代可能是晚中新世的早期。

The junior author of the present paper happened to have purchased some isolated teeth from a Chinese medicine drug-store of the Dengxiang Nationality AutonomousCounty, which is situated about 70km southwest of Lanzhou, the capital city of the Gansu Province, in 1988. The fossils were reportedly unearthed from a village calledWangji. The teeth belong to only two forms: an elasmothere, smaller and moreprimitive than the well known Sinotherium, and a Hipparion of very small size. It ishighly probable that their geologic age is slightly earier than the typical BaodeanMammal Age. Since the mammalian fossils of the pre-Baodean Hipparion fauna areseldom encountered in China, a short report is given below.