A New Zosterophyll Plant,Ramoferis ***.,from the Posongchong Formation of Lower Devonian (Pragian) of Southeastern Yunnan,China

作     者：HAO Shougang XUE Jinzhuang 

作者机构：Key Laboratory of Orogenic Belts and Crustal EvolutionSchool of Earth and Space SciencesPeking UniversityBeijing 100871China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2011年第85卷第4期

页      面：765-776页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：supported by NSFC(Nos.40802003 and 40830211) 

主　　题：zosterophyll Early Devonian Posongchong Flora Yunnan 

摘      要：A new genus and species,Ramoferis amalia *** ***.,is described from the Early Devonian（Pragian）Posongchong Formation,Wenshan district of southeastern Yunnan,*** plant has isodichotomous major axes,which also divide anisotomously distally to produce closely spaced lateral branches,often within fertile *** stalked round to reniform sporangia,borne laterally and spirally over several levels of branches,are distantly to moderately spaced or aggregated into distinct *** stalks increase in width from the base to the sporangial junction resulting in a gradual transition between sporangium and *** with known zosterophylls shows that this plant is most similar to the genera Zosterophyllum and Wenshania,differing in the character combinations of sporangial shape,sporangium/stalk junction,stalk dimensions and orientation,and especially in both sterile and fertile branchlets being borne within the fertile *** addition,the observation and comparison indicate distinct variety in structure of sporangial border and suggest that the two-layered sporangium wall characterized by outer anticlinal layer and inner periclinal layer might represent potential synapomorphies,while the different dehiscence mechanism is an autapomorphy for each taxon in zosterophylls.