Occurrence of Sciadopitys-like fossil wood (Coniferales) in the Jurassic of western Liaoning and its evolutionary implications
Occurrence of Sciadopitys-like fossil wood (Coniferales) in the Jurassic of western Liaoning and its evolutionary implications
复制标题
辽西侏罗纪类松果木化石（Coniferales）的出现及其演化意义
DOI：
10.1007/s11434-011-4850-z
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发表时间：
2012-02-01
影响因子：
--
通讯作者：
Tian Ning
中科院分区：
文献类型：
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作者：
Jiang ZiKun;Wang YongDong;Tian Ning
坐骨木属（Sciadopitys）包含单一物种（S. verticillata），是坐骨木科（松柏目）唯一现存的代表，是非凡的活化石。尽管一些叶状化石被认为属于石松科，但与该科亲缘关系较近的化石木质部材料非常罕见，并且尚未发现同时显示髓部和初级木质部结构的化石，这对于木材鉴定具有重要意义。因此，很难利用化石来了解椎木科植物在地质时期木材解剖结构的演化。本文简要报道了辽西中侏罗世发现的类石松木化石，其具有保存完好的原石松木型次生木质部、内拱初生木质部和异质髓部。这是首次报告木结构保存如此详细的石须科化石标本。这一发现为重建石松科的进化历史和地理分布提供了精确的解剖学证据，也有助于了解中国北方侏罗纪燕辽植物区系的化石多样性。
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 evolutionary history and geographical distribution of Sciadopityaceae, as well as contributing to understanding of the fossil diversity of the Jurassic Yanliao Flora in northern China.