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 |
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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) |
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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Achauveaui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Achauveaui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Achauveaui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Achauveaui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Achauveaui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。Achauveaui“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 lectotypeThis exoskeleton should be regarded as holotype of the type species that bears the generic concept of Arthricocephalus as revisedThe 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 DuyunaspisThe so ̄called lectotype selected by Lane et al(1988)for the type species of Arthricocephalus does not belong to Arthricocephalus chauveaui but to OryctocarellaA specimen different greatly from the original illustration is selected as lectotype against author’s original intentionThree taxa are regarded as junior synonyms of Arthricocephalus,ieArthricocephalus(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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