湘中地区晚特马道克期匿笔石属(Adelograptus)的研究  

Study on Late Tremadoc Adelograptus from Central Hunan, China

作　　者：李明[1] 冯洪真[1] 季鑫鑫[1] 李丽霞[1] 

机构地区：[1]南京大学地球科学系,南京210093

出　　处：《地质论评》2007年第1期113-119,I0002,共8页Geological Review

基　　金：国家自然科学基金资助项目(编号40472014)的成果

摘　　要：湖南省益阳市南坝地区的上特马道克阶笔石地层保存较完整,特别是匿笔石属(Adelograptus)化石材料非常丰富。参照国内外Adelograptus的研究资料,并对研究区该属的始端发育形式研究发现,Adelograptus中一部分类群第二个胞管所在一侧的胎管壁底部几乎全部被掩盖,第一个胞管与第二个胞管夹角较小;另一部分类群第二个胞管所在一侧的胎管壁底部有较长部分未被掩盖,第一个胞管与第二个胞管夹角较大。因此,笔者等以上述Ade-lograptus的始端发育特征为分类依据,将湖南益阳地区的Adelograptus划分为两个种,即:A.tenellus Linnarsson,1871和A.altus Williams,1991。The upper Tremadocian graptolite-bearing stratum from the Nanba area ot Ylyang City, ttunan Provlnce is completely preserved, and Adelograptus is especially abundant. Based on the international data and our current study on the proximal development of this genus, it is very clear that there exists an apparent proximal development differentiation in the level of divergence of the first two thecae from the sieula. Therefore, the proximal development character is selected as the principle for the taxonomy of Adelograptus, and the current graptolite materials from the study area can be assigned into the two species of Adelograptus, named A. teneUus Linnarsson, 1871 and A. altus Williams, 1991.

关 键 词：分类 Adelograptus 晚特马道克期 湘中 

分 类 号：Q949[生物学—植物学]