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摘要 : 寒武纪生命大暴发被称为古生物学和地质学上的一大悬案,一直困扰着学术界。5月2日,《自然—通讯》发表了西北大学教授刘建妮、法国里昂大学Vannier博士等关于节肢动物多样性演化诱因的研究论文。该论文认为:消化腺的出现极有可能是节肢动物多样性分异及大量辐射演化的诱因。



研究人员从叶足动物和节肢动物化石的内部结构入手,结合现生节肢动物的特征,对比研究了中国澄江化石库及北格陵兰的Sirrus Passet化石库中大型叶足动物和节肢动物的消化腺,结果表明消化腺的出现使节肢动物的消化功能和新陈代谢大大增强,而要满足消化功能和新陈代谢的需求,捕食能力必须增强,捕食能力的增强又进一步促进了节肢动物的大量辐射发展。


Sophisticated digestive systems in early arthropods

Jean Vannier, Jianni Liu, Rudy Lerosey-Aubril, Jakob Vinther & Allison C. Daley

Understanding the way in which animals diversified and radiated during their early evolutionary history remains one of the most captivating of scientific challenges. Integral to this is the ‘Cambrian explosion’, which records the rapid emergence of most animal phyla, and for which the triggering and accelerating factors, whether environmental or biological, are still unclear. Here we describe exceptionally well-preserved complex digestive organs in early arthropods from the early Cambrian of China and Greenland with functional similarities to certain modern crustaceans and trace these structures through the early evolutionary lineage of fossil arthropods. These digestive structures are assumed to have allowed for more efficient digestion and me-tabolism, promoting carnivory and macrophagy in early arthropods via predation or scavenging. This key innovation may have been of critical imp0rtance in the radiation and ecological success of Arthropoda, which has been the most diverse and abundant invertebrate phylum since the Cambrian.


来源: 中国科学报 浏览次数:27


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