Frenguellia(Lycopsida)from the uppermost Devonian of West Junggar,Xinjiang Uygur Autonomous Region,NW China,and its implications on protolepidodendralean leaf morphology and paleophytogeography  

作　　者：Bing-Cai Liu Kai Wang Rui-Wen Zong Jiao Bai Ning Yang Yi Wang Hong-He Xu 

机构地区：[1]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Palaeoenvironment,Chinese Academy of Sciences,Nanjing 210008,Jiangsu Province,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430074,Hubei Province,China

出　　处：《Journal of Palaeogeography》2023年第2期263-277,共15页古地理学报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFF0800200);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant Nos.XDA19050101 and XDB26000000)。

摘　　要：Protolepidodendralean lycopsids are characteristic of morphologically complex leaves.Most taxa of this group are herbaceous and widely distributed in global Devonian sediments,with exceptions of a few members,such as Frenguellia eximia from the Lower Carboniferous of Argentina.In this study,we focus on the morphology of Frenguellia eximia and emend its generic and specific diagnoses,based on new materials from the Upper Devonian Hongguleleng Formation of West Junggar,Xinjiang Uygur Autonomous Region,Northwest China,within the fossil-bearing bed palynologically dated as a latest Famennian age.This is the first finding of Frenguellia eximia out of Gondwana.Frenguellia eximia bears planate leaf with three upward pairs of lateral tips,isomorphic sporophyll to the leaf,and elongated,oval sporangium.Leaf morphology of the members of the Order Protolepidodendrales is summarized and classified into lateral-tip and distal-tip types.Lateral-tip type leaf consists of an obvious main body and several paired lateral tips,whereas distal-tip type leaf shows a petiole and a distal lamina with several planate or three-dimensional segments.Two leaf types probably indicate two independent evolutionary routes of microphylls evolving from simple leaf of prelycopsids during the Devonian period.The new occurrence of Frenguellia eximia further shows paleophytogeographical similarities between West Junggar and northwestern Gondwana.

关 键 词：Frenguellia LYCOPSID Microphyll Paleophytogeography DEVONIAN Junggar Basin 

分 类 号：P534.44[天文地球—古生物学与地层学] Q914[天文地球—地质学]