论文部分内容阅读
本文通过对古生代轮藻类群形态结构的比较研究，认为Ｔｒｏｃｈｉｌｉｓｃｕｓ和Ｍｏｅｌｌｅｒｉｎａ具有不同的起源。前者藏卵器包围细胞右旋具横脊，底部结构两侧对称，起源于Ｓｙｃｉｄｉｕｍ；后者的左旋轮藻类包围细胞简单，底部结构辐射对称，源于具简单直立包围细胞的Ｘｉｎｊｉａｎｇｏｃｈａｒａ。根据底部结构的对称性，将轮藻门划分为Ｓｙｃｉｄｉｐｈｙｃｅａｅ和Ｃｈａｒｏｐｈｙｃｅａｅ两个纲。Ｓｙｃｉｄｉｐｈｙｃｅａｅ包含Ｓｙｃｉｄｉａｌｅｓ和Ｔｒｏｃｈｉｌｉｓｃａｌｅｓ两个目，Ｃｈａｒｏｐｈｙｃｅａｅ包括了Ｃｈｏｖａｎｅｌｌａｌｅｓ，Ｍｏｅｌｌｅｒｉｎａｌｅｓｏｒｄ．ｎｏｖ．和Ｃｈａｒａｌｅｓ三个目。
In this paper, through the comparative study on the morphological structure of the Palaeozoan Chara, we think that Trochiliscus and Moellerina have different origins. The former contains a right-lateral ridge surrounded by the egg-holding cells. The bottom structure is symmetrical on both sides and originates from Sycidium. The latter is simple and the bottom structure is symmetrical in radiation, originating from Xinjiangochara with simple upright cells. According to the symmetry of the bottom structure, Chalazia divides into two classes, Sycidiphyceae and Charophyceae. Sycidiphyceae contains both Sycidiales and Trochiliscales, Charophyceae includes Chovanellales, Moellerinalesord. nov And Charales three eyes.