元谋盆地晚中新世古猿动物群元谋无鼻角犀新材料

New material of Acerorhinus yuanmouensis from the Upper Miocene hominoid fauna of the Yuanmou Basin, Yunnan, China

中国南部发现的新近纪哺乳动物化石地点相对较少,犀科材料匮乏,因此云南元谋盆地晚中新世地层产出的犀科化石对于了解该时期中国南部的犀科分布显得尤为重要。本文描述的材料包括下门齿和下颌骨:下门齿中等大小,断面轮廓三角形;下颌联合部后缘位于p3水平,最窄处位于p2水平;下颊齿相对窄小,下前脊退化。根据对比,这些材料的形态特征与Acerorhinus一致,被归入A.yuanmouensis。新材料下颊齿退化的外齿带进一步确定了A.yuanmouensis在Acerorhinus属中的进步性。

Because few Upper Miocene localities have been discovered in South China, rhinoceros specimens from the Upper Miocene hominoid fauna of the Yuanmou Basin are critical for understanding the taxonomy and distribution of rhinoceroses of South China during this time interval. Here we report new specimens from this basin, including three isolated lower incisors（i2） and one partly preserved mandible with lower cheek teeth p3-m3. These specimens will improve our understanding of the Late Miocene rhinoceroses in South China.