青海柴达木盆地第四纪介形类属Ilyocypris壳面瘤状装饰的分类意义

发布时间：2018-02-02 12:32

本文关键词： 介形类 Ilyocypris 瘤状装饰第四纪柴达木盆地青海　出处：《微体古生物学报》2002年01期 　论文类型：期刊论文

【摘要】：Ilyocypris是陆相介形类的一个常见属。对其壳体外层瘤状凸起分类意义的认识历来存有争议。本文在对柴达木盆地第四纪具瘤或经常具瘤的 Ilyocypris分子进行研究并初步查明其瘤状装饰分类意义的基础上 ,将其鉴定描述为三个种 :Ilyocypris gibba,I.echinata和 I.salebrosa。前者个体发育中壳瘤减少直至消失的变化及其与气候环境变迁的相关性表明 ,I.gibba的壳瘤发育程度是表型特征 ,区内原定的 I.biplicata和 I.bradyi实为 I.gibba的无瘤类型。I.echinata的壳瘤也不具备分类意义。I.salebrosa则不同 ,其鲜明而巨大的后背瘤足以与 Ilyocypris属的其它种区别开来 ,是稳定的种征。
[Abstract]:Ilyocypris is a common genus of continental ostracods. The classification significance of its outer bulge has always been controversial. In this paper, Quaternary nodular or often tuberculous in the Qaidam Basin. On the basis of the study of Ilyocypris molecule and preliminary identification of the significance of its nodular decoration classification. It was identified as three species: Ilyocypris gibba. I. echinata and I. salebrosa. the changes in the ontogeny of crustal nodules and their correlation with climatic and environmental changes indicate that the crustal nodules decrease or disappear in the ontogeny of I. echinata and I. The development degree of I.gibba is phenotypic. The original I.biplicata and I.bradyi in the area are. I.gibba 's tumor-free type. I.echinata 's shell nodule has no taxonomic significance. I. salebrosa is different. Its distinct and large dorsal tumor is sufficient to distinguish it from other species of the genus Ilyocypris and is a stable species sign.
【作者单位】：青海油田公司勘探开发研究院中国石油大学地球科学系青海油田公司勘探开发研究院青海油田公司勘探开发研究院
【分类号】：Q911
【正文快照】： 1　前　言Ilyocypris是陆相介形类的重要一员。它的壳面常有瘤状装饰分布 ,这些壳瘤在定种时究竟有什么意义 ,历来有不同见解。在有关 I.gibba,I.biplica-ta,I.bradyi三个种的分类问题上 ,这一分歧显得尤为突出。一些作者认为 ,前者壳瘤的出现与分布并不稳定 ,无瘤的 I.biplic

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