星座图法在二叠纪末期Albaillella属放射虫化石形态分类中的应用  

APPLICATION OF CONSTELLATION GRAPH TO THE MORPHOLOGICAL CLASSIFICATION OF ALBAILLELLA(RADIOLARIA) FROM LATEST PERMIAN

作　　者：金雨溪[1] 宣闯[2] 冯庆来[1] 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国地质大学数理学院,武汉430074

出　　处：《微体古生物学报》2006年第1期16-22,共7页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金项目资助(项目号:40232025)。

摘　　要：晚二叠世放射虫Albaillella属分布广泛,壳体结构相对简单,性状演化较快,具有重要的地层学价值(Kuwahara,1997),但这也给形态种分类带来许多困难。本文选用产自广西扶绥东攀剖面的一批保存完好的Albaillella属放射虫化石样品,对样品壳体的七种形态性状进行测量,并将其进一步转换为七种数值分类指标。尝试应用星座图法综合利用这些指标进行分类,并利用拉格朗日乘子法求解二次规划模型,量化分类指标权值,最后依据此权值对新样品进行判别。文末讨论了此方法的适用范围。Genus Albaillella （Albaillellaria, Radiolaria） occurs widely in latest Permian and has a relatively simple shell structure with rapidly evolving characters. So it is significant in stratigraphy （Kuwahara, 1997）, while its morphological classification faces somewhat difficulties. We measured seven characters of each specimen＇s shell based on the well-preserved fossils of Albaillella yielded from the Dongpan Section, Fusui, Guangxi. These characters were induced to seven parameters for numerical taxonomy. Considering these parameters, we classified the fossils using constellation graph. The weights of all parameters were optimized by Lagrange operator method, and were employed to discriminate the taxonomic status of new specimens. At the end of the paper, the proper areas this method applied to were discussed.

关 键 词：Albaillella 星座图 数值分类 二叠纪 广西 

分 类 号：Q915[天文地球—古生物学与地层学]