摘要
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。
Described in the present paper are monoplacophorans from the Earliest Cambrian Meishucunian Stage in northeastern Yunnan, including 5 new genera, 7 new species and 1 undetermined species, namely Striatoconus yuluensis gen. et sp. nov., Aegitellus concentricus gen. et sp. nov., Papilloconus explanatus gen. et sp. nov., Masculuconus curvativus gen. et sp. nov., Helcionella bellus sp. nov., Igorella minuta sp. nov., Tubatoconus yuluensis gen. et sp. nov. and Striatoconus sp. This paper shows that the early monoplacophoran molluscs had reached at a relatively high diversity of genera and species and, therefore, indicates that the ancestor of the Mollusca might have appeared in Precambrian. It is stressed that shell morphology, muscular scar, morphological function and microstructure should be used for identification of the Monoplacophora.
出处
《微体古生物学报》
CSCD
北大核心
2000年第4期362-377,T005,T007,共18页
Acta Micropalaeontologica Sinica
关键词
软体动物
单板类
新属新种
梅树村阶
早寒武世
Mollusca, Monoplacophora, new genera and species, Meishucunian Stage, Early Cambrian, Eastern Yunnan
