滇西耿马县小新寨中二叠世沙子坡组“Rugososchwagerina”的再研究  

RESTUDY OF THE “RUGOSOSCHWAGERINA” OF THE MIDDLE PERMIAN FROM XIAOXINZHAI OF GENGMA,WESTERN YUNNAN

作　　者：史宇坤[1] 杨湘宁[1] 金小赤[2] 

机构地区：[1]南京大学地球科学系,南京210093 [2]中国地质科学院地质研究所,北京100037

出　　处：《古生物学报》2005年第4期535-544,共10页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(No.40232024)资助课题。

摘　　要：中二叠世的Eopolydiexodina-Rugososchwagerina类动物群是一个具有重要地层及古地理意义的动物群,也是滇西保山地块沙子坡组的一个指示性动物群。文中详细研究了耿马小新寨沙子坡组“Rugososchwageri-na”标本的形态学特征,阐明了其与RugososchwagerinaMiklukho-Maklay,1956的模式标本在特征上的显著区别。依据幼壳形态特征在类个体发育及系统发生研究中的重要性,对小新寨“Rugososchwagerina”标本的属级分类提出质疑,并建议建立新属Xiaoxinzhaiellagen.nov.。The Eopolydiexodina- Rugososchwagerina assemblage, which is considered as the representative association of the Middle Permian fusulinacean fauna on the Gondwana-derived blocks and the margin of Gondwana continents,has been previously reported from the Baoshan Block, West Yunnan （Ueno, 2000）. Based on new materials collected recently from the Shazipo Formation in the Xiaoxinzhai of Gengma County, West Yunnan, we conducted a detailed morphological study on the specimens which might be assigned to “Rugososchwagerina” to confirm the identification and classification of Fusulinid fossils from this important section on the Baoshan Block. However,results of this study have revealed remarkable morphological differences between the specimens of “Rugososchwagerina” and the type specimen of Rugososchwagerina Miklukho-Maklay,

关 键 词：Xiaoxinzhaiella gen.nov. Rugososchwagerina Eopolydiexodina 沙子坡组 耿马 云南 中二叠世 耿马县 沙子 

分 类 号：Q915[天文地球—古生物学与地层学]