云南晚中新世苏门答腊兔(Nesolagus)分离时间的标定

摘要

报道了发现于云南昭通水塘坝的晚中新世兔类,它与时代较早的云南禄丰地点的长褶“翼兔”(“Alilepus”longisinuosus)属于同一个种,两者柄息的环境均为潮湿的沼泽地区.前臼齿的形态表明该种是现今生活在湿润地区条纹兔(即苏门答腊兔Nesolagus)的早期代表,因此将陔种更名为长褶苏门答腊兔Nesolagus longisinuosus (Qiu &Han,1986).Nesolagus化石记录在大约7 Ma的华南地区的证据与线粒体学研究推测Nesolagus的现生种类在晚中新世从兔科演化主线上分出来的结论一致.重建了苏门答腊兔演化历史的大致一幕,即其在8 Ma后出现,随即迅速地扩散到整个东南亚并最终到达现今的苏门答腊地区.%The rabbit from the Late Miocene Shuitangba site in Yunnan Province represents the same species as that from the older site of Lufeng,Yunnan.Both settings record a wet,swampy habitat.Premolar morphology shows that the species is an early representative of the extant striped rabbit genus,which today lives in moist habitat,and should be designated Nesolagus longisinuosus (Qiu & Han,1986).Fossil evidence for Nesolagus by about 7 Ma in the fossil record of South China is consistent with mitochondrial evidence for the Late Miocene split of the extant species of Nesolagus.We reconstruct a scenario for the origin of Nesolagus after 8 Ma,followed by rapid spread through Southeast Asia into present-day Sumatra.