暗额藻属Aneumastus在中国的出现及其地层意义(硅藻门Bacillariophyta)

The Discovery of Genus Aneumastus(Bacillariophyta) in China and its Stratigraphic Significance

从内蒙古克什克腾旗浩来呼热乡硅藻土层中获得丰富的硅藻化石,采用激光共聚焦显微扫描技术(Confocal Laser Scanning Microscopy)的研究方法,对其中由Mann & Stickle(1992)确立的新属暗额藻属Aneumastus在我国地层中的出现,及其在分类学上的意义进行了深入的讨论。该属的深入研究对今后古湖沉积物的地层及古生态研究有重要的现实意义。

As a new genus of diatom,Aneumastus was first defined by D.G.Mann and A.J.Stickle in 1992.Five representatives of Aneumastus were discovered by the authors in the Late Pleistocene and Holocene diatomites in Hexigten Banner of Inner Mongolia.With the technique of Light Microscopy（LM） and Confocal Laser Scanning Microsystem（CLSM）,the specimens were studied for the characteristics of valve and structure.Aneumastus includes 2 species and 3 forms A.tusculoides（Cl.-Eu.） Mann,A.tusculus（Ehr.） Mann,A.tusculus f.angulat（Cl.-Eul.） Li.（f.n.comb.）,A.tusculus f.minor（Hust.） Li（f.n.comb.）,A.tusculus f.rostrata（Hust.） Li（f.n.comb.）.The distribution of the species and the variety forms in the strata are detailed described in the paper.This discovery is especially important for the paleo-ecological study of ancient lacustrine sediments in the area,and the authors hold that the evolution of the species of Aneumastus is of stratigraphic significance,and hence the further study of the genus Aneumastus is necessary.