彭善池,朱学剑,L.E.Babcok,I.V.Korovnicov.论寒武纪三叶虫节头虫属:概念和异名[J].贵州地质,2015,32(2):83-89
论寒武纪三叶虫节头虫属:概念和异名
Restudy on the Genus Arthricocephalus(Cambrian):concept and synonyms
  
DOI:
中文关键词:  节头虫属  概念  异名  贵州铜仁
英文关键词:]Arthricocephalus  generic concept  synonyms  Tongren of Guizhou
基金项目:国家自然科学基金会2014年重点基金项目“全球寒武系第4阶和第10阶高精度界线地层及其 “金钉子”研究”(基金号:41330101)
作者单位
彭善池 现代古生物学和地层学国家重点实验室江苏南京210008 
朱学剑 中国科学院南京地质古生物研究所 江苏南京210008 
L.E.Babcok School of Earth SciencesThe Ohio State UniversityColumbusOH 43210USA 
I.V.Korovnicov Trofimuk Institute of Petroleum Geology and Geophysics SB RASNovosibirskRussia 
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中文摘要:
      节头虫属(Genus Arthricocephalus)的概念一直较为混乱,在为它的模式种乔氏节头虫(Arthricocephalus chauveaui)指定“选模”后,又进一步加剧。经对Achauveaui的原始手标本上保存的所有三叶虫研究后,发现命名者Bergeron所附Achauveaui的唯一图片,依据的是其中一枚背壳,特征吻合,从而认定该背壳是Achauveaui的正模,代表了模式种和节头虫属的概念,是该种和该属名称的载体。也表明为Achauveaui建立“选模”,既无必要,也违背命名者的本意。而且选择一个不归属于Achauveaui的标本来代表该种、该属的概念,就更不妥当。经研究,手标本上的三叶虫不是同一个种,而是隶属于三个不同种,这三个种又应归属于三个不同的属,即Arthricocephalus, Oryctocarella和Duyunaspis。Achauveaui“选模”头盖并不属于该种,应归属于Oryctocarella duyunensis。研究还表明,有三个分类单元是Arthricocephalus的晚出异名,即Arthricocephalus (Arthricocephalites) Chien et Lin in Lu et al,1974,Haliplanktes Blaker et Peel,1997,和 Arthricocephalites Chien et Lin sensu Yuan et al,2002。
英文摘要:
      The generic concept of Arthricocephalus is a matter of great confusion,and the confusion has been exacerbated by establishment of so-called lectotype for its monotypic type species Arthricocephalus chauveaui Bergeron,1899(Lane et al,1988)In fact,a diagram of the exoskeleton illustrated by Bergeron for the type species was apparently based on a single exoskeleton that is easily identifiable among the specimens used to establish the type species,obviating the necessity for designation of a lectotypeThis exoskeleton should be regarded as holotype of the type species that bears the generic concept of Arthricocephalus as revisedThe slab that Bergeron studied contains four exoskeletons,one cranidium and one pygidium,all of which,as revised,do not belong to a single species but to species assigned to three separate genera,Arthricocephalus,Oryctocarella and DuyunaspisThe so ̄called lectotype selected by Lane et al(1988)for the type species of Arthricocephalus does not belong to Arthricocephalus chauveaui but to OryctocarellaA specimen different greatly from the original illustration is selected as lectotype against author’s original intentionThree taxa are regarded as junior synonyms of Arthricocephalus,ieArthricocephalus(Arthricocephalites)Chien et Lin in Lu et al,1974,Haliplanktes Blaker et Peel,1997,and Arthricocephalites Chien et Lin sensu Yuan et al,2002
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