鳞鱼腹侧神经索的保存与早期演化

IF 12.5 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Deng Wang, Jean Vannier, José M. Martín-Durán, María Herranz, Chiyang Yu
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引用次数: 0

摘要

蛔虫(线虫纲+鳞虫纲)以不同等级的神经组织为典型,反映了复杂的进化史。化石记录提供了一个独特的机会,通过对灭绝代表的特殊保存,重建神经系统的早期特征进化。我们关注它们的神经系统,因为它出现在早寒武纪和中寒武纪的化石中。我们发现,一些已知的最古老的代表,无论是保存在碳质压缩中(早和中寒武纪伯吉斯型保存),还是在三维空间中二次磷化(例如,基底寒武纪宽川堡组,约5.35亿年),都有一个不配对的腹侧神经索(VNC),它沿着躯干以一个古怪的位置运行,就像现代的priapulids和线虫一样。综合这些化石数据的系统发育分析表明,鳞虫的祖先有一个不配对的VNC,配对神经系统可能在Kinorhyncha和Loricifera中独立进化,更重要的是,在全节肢动物中,可能与成对附属物和双边协调运动的兴起有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preservation and early evolution of scalidophoran ventral nerve cord
Ecdysozoan worms (Nematoida + Scalidophora) are typified by disparate grades of neural organization reflecting a complex evolutionary history. The fossil record offers a unique opportunity to reconstruct the early character evolution of the nervous system via the exceptional preservation of extinct representatives. We focus on their nervous system as it appears in early and mid-Cambrian fossils. We show that some of the oldest known representatives of the group either preserved in carbonaceous compression (early and mid-Cambrian Burgess-type preservation) or secondarily phosphatized in three dimensions (e.g., basal Cambrian Kuanchuanpu Formation, ca. 535 million years) had an unpaired ventral nerve cord (VNC) that ran along the trunk in an eccentric position as in modern priapulids and nematodes. A phylogenetic analysis integrating these fossil data suggests that ancestral scalidophorans had an unpaired VNC and that paired nervous systems probably evolved independently in Kinorhyncha and Loricifera, and, more importantly, in panarthropods in possible relation with the rise of paired appendages and bilaterally coordinated motricity.
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来源期刊
Science Advances
Science Advances 综合性期刊-综合性期刊
CiteScore
21.40
自引率
1.50%
发文量
1937
审稿时长
29 weeks
期刊介绍: Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.
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