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云南临沧晚中新世类黄杞及其古生物地理意义

PALAEOCARYAFROM THE LATE MIOCENE OF LINCANG,YUNNAN PROVINCE AND THE DISCUSSION ON THE GENUS’PALAEOBIOGEOGRAPHY

【Author in Chinese】 邵洋李斌科张思航陈天宇解三平

【Author】 SHAO Yang;LI Bin-ke;ZHANG Si-hang;CHEN Tian-yu;XIE San-ping;School of Earth Sciences,Lanzhou University;Key Laboratory of Mineral Resources in Western China of Gansu Province;

【Institution】 兰州大学地质科学与矿产资源学院甘肃省西部矿产资源重点实验室

【Abstract in Chinese】 通过对产自云南临沧邦卖盆地的9块类黄杞翅果化石形态特征的观察和研究,将它们鉴定为3个种。其中包括1个新种临沧类黄杞(Palaeocarya lincangensis Shao and Xie sp.nov.),还包括2个已知种云南类黄杞(Palaeocaryayunnanensis)和长翅类黄杞(Palaeocarya longialata)。Palaeocarya lincangensis主要特征为:羽状脉,中、侧裂片长度近似相等,果翅裂片基部与顶端宽度相差不大;侧裂片分裂较浅,无始叶;未见小坚果,果柄较长。另外,对类黄杞化石记录的全球统计表明:类黄杞在始新世至渐新世最为繁盛,之后逐渐衰落;现生黄杞族的分布范围进一步退缩至低纬度地区。这与渐新世以后全球气候逐渐变冷的趋势相一致。研究类黄杞与现生黄杞族脉序特征发现:亚洲地区的类黄杞绝大多数为羽状脉序,与分布于东亚和东南亚地区的现生Engelhardia和Alfaropsis相似;美洲和欧洲地区的类黄杞绝大数为三出脉,与分布于中美洲地区的现生Oreomunnea和Alfaroa一致。

【Abstract】 The observation and investigation on the morphological characters of nine Palaeocarya samaras from Bangmai Basin,Lincang,Yunnan Province allow us assign them into three species,which include one new species-Palaeocarya lincangensis Shao and Xie sp.nov.and two known species-Palaeocaryayunnanensis and Palaeocarya longialata.Palaeocarya lincangensis are characterized by the penninerved venation of lobes,approximately equal length of the middle and lateral lobes,the close width in the top and the bottom of lobes,the shallow lobulation of lobes,absence of the prophyllum and the nutlet,and the relative longer pedicel.The global fossil record of Palaeocaryafrom Eocene to Pliocene indicates that the Eocene and Oligocene was the prosperous era of Palaeocaryaplants and after that they gradually declined.The extant genera of the tribe Engelhardieae further withdraw to the low latitudes.This reducing of distribution range of the tribe Engelhardieae is consistent to the global cooling trend after the Oligocene during the Cenozoic.Studies on the venation of Palaeocarya and Engelhardieae show that the majority of Palaeocarya in Asia was characterized by penninerved venation,similar to that of extant Engelhardia and Alfaropsis distributed in East Asia and Southeast Asia;otherwise,Palaeocarya found in North America and Europe was unique by trinervous venation,corresponding to the extant Oreomunnea and Alfaroa living in the Middle America.

【Keywords in Chinese】 类黄杞古生物地理邦卖组晚中新世临沧
【Key words】 PalaeocaryapalaeobiogeographyBangmai FormationLate MioceneLincang
【Fund】 国家自然科学基金(No.41172021);兰州大学中央高校基本科研业务费专项资金(lzujbky-2015-66)资助
  • 【CLC code】Q914
  • 【Downloads】62
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