New material of Coniopteris simplex from the Middle Jurassic of the Ordos Basin,Inner Mongolia,China and implications on its spatio-temporal distribution and paleogeography  

作　　者：Yun-Feng Li Chang-Lu Zhang Fei Liang Xiao Tan Fan-Hao Gong Chun-Lin Sun Tao Li Yu-Ling Na 

机构地区：[1]Research Center of Paleontology and Stratigraphy,Jilin University,Changchun 130026,Jilin Province,China [2]College of Earth Sciences,Jilin University,Changchun 130061,Jilin Province,China [3]College of Paleontology,Shenyang Normal University,Shenyang 110034,Liaoning Province,China [4]Key Lab of Evolution of Past Life in NE Asia,Ministry of Natural Resources,Shenyang Normal University,Shenyang 110034,Liaoning Province,China [5]Shenyang Center of Geological Survey,China Geological Survey,Shenyang 110034,Liaoning Province,China

出　　处：《Journal of Palaeogeography》2024年第2期199-211,共13页古地理学报（英文版）

基　　金：financially supported by National Natural Science Foundation of China(Grant Nos.42172011,42172017,41902009,42293280 and 31800182);State Key Laboratory of Palaeobiology and Stratigraphy(Nanjing Institute of Geology and Palaeontology,CAS)(Grant No.183117);Liaoning Provincial Natural Science Foundation(Grant No.2021-BS-158)。

摘　　要：Coniopteris simplex is a common component in many Jurassic floras.However,due to morphological variations in sterile fronds and incomplete preservation of reproductive organs,its classification has been controversial for a long time.Here,we present new material collected from the Middle Jurassic Yan’an Formation in the Ordos Basin,Inner Mongolia.The new material reveals important morphological characters,including hemi-dimorphic fronds,two forms of sterile pinnae,short-stalked sori and sporangia on fertile fronds,annulus of sporangium composed of about 30 cells,in situ rounded triangular spores with protruded suture,and the lips of trilete laesura encircled by one or two rows of small ostioles.Based on these observations,we emended the diagnosis of this common species.The spatio-temporal distribution of Coniopteris simplex shows that the iconic species was restricted to the paleolatitudes ranging from 19.5°N to 48.9°N in the Northern Hemisphere during the Early—Late Jurassic,mainly distributed in the tropical to paratropical zones,and the paleolongitude ranging from 9.6°E to 129.3°E,which may be limited by the opening of the Viking Corridor and the splitting of the Central Atlantic Ocean.

关 键 词：Coniopteris simplex Yan'an Formation Middle Jurassic Inner Mongolia PALEOGEOGRAPHY 

分 类 号：P534.52[天文地球—古生物学与地层学]