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本文描述了云南东部早寒武世早期梅树村阶软体动物单板类化石 ,计有 5新属 7新种和 1个未定种 ,它们是 Striatoconusyuluensisgen.etsp.nov.,Striatoconussp.,Aegitellusconcentri-cus gen.et sp.nov.,Tubatoconus yuluensis gen.et sp.nov.,Papilloconus explanatus gen.etsp.nov.,Masculuconuscurvativusgen.etsp.nov.,H elcionella bellussp.nov.,Igorella minutasp.nov.。证明了早期软体动物单板纲已有较高的属种分异度 ,认为软体动物的最早祖先应该出现在前寒武纪。本文还提出了壳体形状、肌痕和显微结构可以作为鉴定单板纲的依据。
This paper describes the molluscan monolithic fossils from the early Precambrian in the eastern Yunnan province in the early Mertanian Period. There are 5 new genera, 7 new species and 1 undetermined species, which are Striatoconusyuluensisgen.etsp.nov., Striatoconussp., Aegitellusconcentri-cus gen.et sp.nov., Tubatoconus yuluensis gen. et sp. nov., Papilloconus explanatus gen. e.p.nov., Masculuconus curvativusgen.etsp.nov., H elcionella bellussp. nov., Igorella minutasp. It is proved that the early mollusc monolayer has higher taxonomic differentiation, and the earliest ancestors of molluscs should be found in Precambrian. The paper also proposed shell shape, muscle marks and microstructure can be used as a basis for identification of single board.