贝加尔茨康叶在新疆白杨河中侏罗统的发现

Discovery of Czekanowskia baikalica from Middle Jurassic of Baiyanghe area,Xinjiang,China

茨康类植物是全球中生代植物的重要组成部分,对研究植物界的发展演化具有重要的意义。新疆准噶尔盆地白杨河中侏罗统西山窑组发现茨康类植物化石,通过对其外部形态和表皮构造研究,依据表皮构造下气孔式,脉络区普通表皮细胞5~8列,普通表皮细胞未见中央乳突等特征认定为贝加尔茨康叶—Czekanowskia(Vachrameevia)baikalica。虽然该类植物在中国北方地区含煤地层中分布较多,但茨康叶属(瓦赫拉梅耶夫亚属)过去仅在中国内蒙古自治区石拐盆地中侏罗统有所报道,在新疆地区尚属首次发现。当前材料的研究对了解该属的分类、地理分布及古气候研究等具有一定意义。

Czekanowskiales is an important part of the world's Mesozoic plants,Czekanowskiales plants' appearance is of great significance to the research of the development and evolution of the plant community.Based on the gross leaf morphology and epidermal structures,such as the leaves hypostomatic,stomatiferous bands are formed by 5~8 rows of epidermal cells,and anticlinal walls without cuticular papillous thickenings,the author reports the new material of Czekanowskia(Vachrameevia)baikalica,from the Middle Jurassic Xishanyao Formation of Baiyanghe,which appears to be the first discovery of this species in Junggar Basin.The discovery of the new material also provides new fossil record in Middle Jurassic age and are beneficial for the reproduction of paleogeography,paleoclimate and paleoenvironment.