Yochelcionella在河南的出现及迁移演化

APPEARANCE OF Yochelcionella IN HENAN,CHINA AND ITS MIGRATION AND EVOLUTION

本文分析了早寒武世单板类Ｙｅｒｈｅｌｃｉｏｎｅｌｌａ在世界上几个国家和地区的产出层位及形态特征，认为中国河南的Ｙ．ｃｈｉｎｅｎｓｉｓ产出层位最低，形态结构原始，是世界上发现的最古老的Ｙｏｃｈｅｌｃｉｏｎｅｌｌａ，提出Ｙ．ｃｈｉｎｅｎｓｉｓ在河南前次出现，并迁移到澳大利亚Ｆｌｉｎｄｅｒｓ地区生存。西伯利亚的Ｙ．ｓｔｙｌｉｆｅｒａ和北美的Ｙ．ａｍｅｒｉｃａｎａ也可能与河南的Ｙ．ｃｈｉｎｅｎｓｉｓ有一定联系。澳大利亚新南威尔士所产Ｙ．ｃｙｒａｎｏ．Ｙ．ｄａｌｅｋｉ．Ｙ．ｏｓｔｅｎｔａｔａ三个高级种与Ｙ．ｃｈｉｎｅｎｓｉｓ有着密切的演化关系。此外对Ｙｏｃｈｅｌｃｉｏｎｅｌｌａ的起源与进化提出见解。

This paper analyses the stratigraphical horizons and morphogical features of Yochel-cionella yield in several countries and regions of the world,regarding that the horizon of Y.chinensis found in Henan,China is the lowest,its morphological structure is most primeval,and therefore is the most ancient Yochelcionella. The author advanced that Yochelcionella ap-pearred first in Henan,and then migrated to Central Flinders Range,Australia and existedthere.Y. stylifera reported form Siberia and Y.americana found in North America are all con-nected with Y. chinensis of Henan. The three advanced species:Y.cyrano,Y. daleki,Y. ostenta-ta yielded in New South Wales,Australia possess close evolutionarv relation with Y. chinen-sis. In addition,this paper sheds light on the origin and evolutionary direction of Yochelcionel-al.