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寒武纪叶足动物对于探讨节肢动物起源的意义

发表时间:2008-01-15  浏览量:1837  下载量:715
全部作者: 刘建妮,舒德干,韩健,张志飞
作者单位: 西北大学地质系早期生命研究所及教育部大陆动力实验室;中国地质大学地球科学与资源学院
摘 要: 位于我国云南省东部的早寒武纪澄江化石库由于保存了精美的软躯体构造化石被认为是研究早期后生动物辐射的绝佳窗口,故而备受世人瞩目。节肢动物作为澄江化石库中数目最多、分异度最大的一个门类,其起源和早期演化一直是学术界激烈争论的重大论题之一。传统上认为节肢动物与环节动物密切相关,但新的分子生物学资料表明这两大类群分属于原口动物超级谱系中的蜕皮类和触手担轮类两大不同分支。因此探索节肢动物起源的最终解题钥匙应该赋存在早已绝灭了的“基干类群”(stem groups)的直接化石证据中。古生物学家经过多年的研究发现,节肢动物应该植根于早期一类已经灭绝的具有成对不分节附肢的叶足动物。笔者通过对叶足动物Miraluolishania、Jianshanopodia及Megadictyon的研究,为“叶足动物—节肢动物”提供了可靠的化石实证。
关 键 词: 古生物学;叶足动物; 节肢动物; 寒武纪; 澄江化石库
Title: The implications of Cambrian lobopods for origin of arthropods
Author: LIU Jianni, SHU Degan, HAN Jian, ZHANG Zhifei
Organization: Early Life Institute and the Key Laboratory of Continental Dynamics, Northwest University;School of Earth Sciences and Resources, China University of Geosciences
Abstract: The Early Cambrian Chengjiang Lagerstätte, located in the Eastern Yunnan of China, has been regarded as a crucial window to observe the radiation of the metazoan because of the well preserved soft-bodied fossils. Arthropods, as a predominant group in living animal kingdom (accounting for ~80% of the total species), also has the greatest diversity in the number and morphology in Early Cambrian Chengjiang Lagerstätte (about half of the total species). Thus, the origin and diversification of arthropods is one of the most hotly-debated subject. Arthropods used to be thought closely related with annelids, but they are now believed to be separated into two major realms within Protostomia on the basis of new molecular data, i.e. the Ecdysozoa and Lophotrochozoa respectively. Therefore, the study of extinct “stem groups” provides the key to understand the early evolution of and the origin of the arthropods. The paleontologists had done a lot of hard work and found the Cambrian lobopods bore pairs of non-segmented primitive limbs might be ancestral to all arthropods. Based on the information of Miraluolishania、Jianshanopodia and Megadictyon, we have made some progresses in tracing relationship between lobopods and arthropods.
Key words: Palaeobiology; Lobopod; arthropods; Cambrian; Chengjiang fossil Lagerst鋞te
发表期数: 2008年5月第1期
引用格式: 刘建妮,舒德干,韩健,等. 寒武纪叶足动物对于探讨节肢动物起源的意义[J]. 中国科技论文在线精品论文,2008,1(1):68-72.
 
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