Fuxianhuiid ventral nerve cord and early nervous system evolution in Panarthropoda
Fuxianhuiid ventral nerve cord and early nervous system evolution in Panarthropoda
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抚仙会腹神经索与泛节肢动物早期神经系统进化
DOI：
10.1073/pnas.1522434113
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
Xi-guang Zhang
中科院分区：
文献类型：
--
作者：
Jie Yang;Javier Ortega-Hernández;Nicholas J. Butterfield;Yu Liu;George S. Boyan;Jin-bo Hou;Tian Lan;Xi-guang Zhang
Panarthropods are typified by disparate grades of neurological organization reflecting a complex evolutionary history. The fossil record offers a unique opportunity to reconstruct early character evolution of the nervous system via exceptional preservation in extinct representatives. Here we describe the neurological architecture of the ventral nerve cord (VNC) in the upper-stem group euarthropod Chengjiangocaris kunmingensis from the early Cambrian.Xiaoshiba Lagerstätte (South China). The VNC of C. kunmingensis comprises a homonymous series of condensed ganglia that extend throughout the body, each associated with a pair of biramous limbs. Submillimetric preservation reveals numerous segmental and intersegmental nerve roots emerging from both sides of the VNC, which correspond topologically to the peripheral nerves of extant Priapulida and Onychophora. The fuxianhuiid VNC indicates that ancestral neurological features of Ecdysozoa persisted into derived members of stem-group Euarthropoda but were later lost in crown-group representatives. These findings illuminate the VNC ground pattern in Panarthropoda and suggest the independent secondary loss of cycloneuralian-like neurological characters in Tardigrada and Euarthropoda.
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B. Mittmann;G. Scholtz
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Pflüger HJ
DOI：
10.5860/choice.186752
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