Occurrence of Sciadopitys-like fossil wood (Coniferales) in the Jurassic of western Liaoning and its evolutionary implications  

作　　者：JIANG ZiKun WANG YongDong ZHENG ShaoLin ZHANG Wu TIAN Ning 

机构地区：[1]Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China [2]Shenyang Center of China Geological Survey,Shenyang Institute of Geology and Mineral Resources,Shenyang 110034,China [3]Graduate University of Chinese Academy of Sciences,Beijing 100049,China [4]Institute ofPalaeontology,Shenyang Normal University,Shenyang 110034,China

出　　处：《Chinese Science Bulletin》2012年第6期569-572,共4页

基　　金：supported by the Knowledge Innovation Program of Chinese Academy of Sciences(KZCX-2-YW-154);the National Basic Research Program of China(2012CB822000 and 2006CB701401);the National Natural Science Foundation of China (40972008, 40472004 and J0930006);UNESCO-IUGS Project IGCP 506

摘　　要：The genus Sciadopitys, containing a single species (S. verticillata), is the only extant representative of the Family Sciadopityaceae (Coniferales), and is a remarkable living fossil. Although some leafy fossils have been ascribed to Sciadopityaceae, fossil xylem material with a close affinity to this family is very rare, and there have been no fossils found showing both pith and primary xylem structures, which are of great importance for wood identification. Thus, it has been difficult to use fossils for the understanding of wood anatomy evolution in the sciadopityaceous plants over geological time. In this note we briefly report on Sciadopitys-like fossil wood found in the Middle Jurassic of western Liaoning, which bears well-preserved Protosciadopityoxylon-type secondary xylem, endarch primary xylem and heterogeneous pith. This is the first report of fossil specimens of the Sciadopityaceae with such detailed preservation of wood structures. The discovery provides precise anatomical evidence for reconstructing the evolu- tionary history and geographical distribution of Sciadopityaceae, as well as contributing to understanding of the fossil diversity of the Jurassic Yanliao Flora in northern China.The genus Sciadopitys, containing a single species （S. verticillata）, is the only extant representative of the Family Sciadopityaceae （Coniferales）, and is a remarkable living fossil. Although some leafy fossils have been ascribed to Sciadopityaceae, fossil xylem material with a close affinity to this family is very rare, and there have been no fossils found showing both pith and primary xylem structures, which are of great importance for wood identification. Thus, it has been difficult to use fossils for the understanding of wood anatomy evolution in the sciadopityaceous plants over geological time. In this note we briefly report on Sciadopitys-like fossil wood found in the Middle Jurassic of western Liaoning, which bears well-preserved Protosciadopityoxylon-type secondary xylem, endarch primary xylem and heterogeneous pith. This is the first report of fossil specimens of the Sciadopityaceae with such detailed preservation of wood structures. The discovery provides precise anatomical evidence for reconstructing the evolu- tionary history and geographical distribution of Sciadopityaceae, as well as contributing to understanding of the fossil diversity of the Jurassic Yanliao Flora in northern China.

关 键 词：演化历史 化石木 辽宁西部 侏罗系 次生木质部 类似 木材解剖 木材鉴定 

分 类 号：P311[天文地球—固体地球物理学] Q914.21[天文地球—地球物理学]