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地质学报  2004 

鲁西地区寒武纪原始真牙形石分类方案的探讨

Keywords: 晚寒武世原始真牙形石副牙形石鲁西地区生物地层划分

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Abstract:

鲁西地区晚寒武世地层发育,产有数量丰富、分异度大的原始真牙形石分子,经笔者研究,建立了2新属、2新种及2未定种Camconodontusrotundatusgeoetsp.nov.,Camconodontussp.,Laiwunoduslateronodusgenetsp.nov.,Laiwunodussp.;对Dasytodus属进行了补充修订,建立了1新种Dasytodusposteronodussp.nov.。这些属种的建立丰富了对已有原始真牙形石概念的认识。基于内部构造的观察,对原始真牙形石及部分易混淆的副牙形石进行正确的分类。以此为基础,分析、总结了这些分子外部形态上的差异,选用的分类原则和标准是从一般到特殊、特征明显程度逐渐降低,划分出了三类原始真牙形石和一类副牙形石,这在很大程度上简化了早期真牙形石分类研究的复杂性,为早期真牙形石的深入研究奠定了基础。

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