Speciation of the genus Arthricocephalus Bergeron, 1899 (Trilobita) from the late Early Cambrian and its stratigraphic significance  

作　　者：YUAN Jinliang ZHAO Yuanlong YANG Xinglian 

机构地区：[1]Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China [2]College of Resource and Environment of Guizhou University, Guiyang 550003, China

出　　处：《Progress in Natural Science:Materials International》2006年第6期614-623,共10页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant Nos. 40372023, 40162002)

摘　　要：The genus Arthricocephalus Bergeron, 1899 is revised, and Halipanktos Balker ＆ Peel, 1997 is suggested here as a senior synonym. The subgenus Arthrieocephalus （Arthrieocephalites） Chien ＆ Lin in Lu el al., 1974 is considered as a separate genus. Of the 20 previously assigned species of Arthricocephalus （Arthricoeephalus） Bergeron, 1899, Arthricocephalus （Arthricoce ephalites） Chien ＆ Lin in Lu et al., 1974, Arthricocephalus （Euarthricoeephalus） Ju, 1983 are lumped into eight species. The speciation trend of Arthricocephalus and Arthricocephalites is demonstrated based on their stratigraphic occurrences. It not only enhances the resolution of the biostatigraphie zonation in the uppermost Lower Cambrian, but also represents a potential candidate to define the Duyunian stage. The base of the stage is suggested at the first appearance datum （FAD） of Arthricocephalus ehauveaui Bergeron, 1899 within the evolutionary lineage from Ar. jiangkouensis Yin in Yin ＆ Li, 1978 to Ar. chauveaui in a global scale.类 Arthricocephalus Bergeron， 1899 被修订，并且 Halipanktos Balker 与皮尔， 1997 作为一个高级同义词这里被建议。在陆等的亚属 Arthricocephalus (Arthricocephalites ) Chien 与林，一个分开的类。Arthricocephalus (Arthricocephalus ) Bergeron 的 20 以前分配的种类， 1899，在陆等的 Arthricocephalus (Arthricocephalites ) Chien 与林， 1974， Arthricocephalus (Euarthricocephalus ) Ju， 1983 是进八种的 lumped。Arthricocephalus 和 Arthricocephalites 的种形成趋势基于他们的 stratigraphic 出现被表明。它不仅提高 biostatigraphic 带状配列的决定在最高更低寒武纪，而且代表一个潜在的候选人定义 Duyunian 阶段。阶段的底在 Arthricocephalus chauveaui Bergeron 的第一本外观资料(一度时髦的风尚) 被建议， 1899 在从 Ar 的进化的系以内。在殷与李，的 jiangkouensis 殷 1978 到 Ar。在全球规模的 chauveaui。

关 键 词：late Early Cambrian Duyunian stage speciation of Arthricocephalus and Arthricocephalites biostratigraphy. 

分 类 号：Q911.6[天文地球—古生物学与地层学]