Fossils from South China redefine the ancestral euarthropod body plan | |
Aria, Cedric2,3; Zhao, Fangchen (赵方臣)2,3; Zeng, Han (曾晗)2,3; Guo, Jin4; Zhu, Maoyan (朱茂炎)1,2,3 | |
刊名 | BMC EVOLUTIONARY BIOLOGY
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2020-01-08 | |
卷号 | 20期号:1页码:17 |
关键词 | Euarthropoda Body plan Cambrian Chengjiang Macroevolution Homology |
ISSN号 | 1471-2148 |
DOI | 10.1186/s12862-019-1560-7 |
英文摘要 | Background Early Cambrian Lagerstatten from China have greatly enriched our perspective on the early evolution of animals, particularly arthropods. However, recent studies have shown that many of these early fossil arthropods were more derived than previously thought, casting uncertainty on the ancestral euarthropod body plan. In addition, evidence from fossilized neural tissues conflicts with external morphology, in particular regarding the homology of the frontalmost appendage. Results Here we redescribe the multisegmented megacheirans Fortiforceps and Jianfengia and describe Sklerolibyon maomima gen. et sp. nov., which we place in Jianfengiidae, fam. nov. (in Megacheira, emended). We find that jianfengiids show high morphological diversity among megacheirans, both in trunk ornamentation and head anatomy, which encompasses from 2 to 4 post-frontal appendage pairs. These taxa are also characterized by elongate podomeres likely forming seven-segmented endopods, which were misinterpreted in their original descriptions. Plesiomorphic traits also clarify their connection with more ancestral taxa. The structure and position of the "great appendages" relative to likely sensory antero-medial protrusions, as well as the presence of optic peduncles and sclerites, point to an overall homology with the anterior head of radiodontans. This is confirmed by our Bayesian phylogeny, which places jianfengiids as the basalmost euarthropods, paraphyletic with other megacheirans, and in contiguity with isoxyids and radiodontans. Conclusions Sklerolibyon and other jianfengiids expand the disparity of megacheirans and suggest that the common euarthropod ancestor possessed a remarkable phenotypic variability associated with the externalized cephalon, as well as endopods that were already heptopodomerous, which differs from previous hypotheses and observations. These animals also demonstrate that the frontalmost pair of arthrodized appendage is homologous between radiodontans and megacheirans, refuting the claim that the radiodontan frontal appendages evolved into the euarthropod labrum, and questioning its protocerebral identity. This evidence based on external anatomy now constitutes a solid benchmark upon which we should address issues of homology, with the help of carefully examined palaeoneurological data. |
资助项目 | Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China[41921002] ; National Natural Science Foundation of China[41472012] ; President's International Fellowship Initiative grant[2018PC0043] ; China Postdoctoral Science Foundation[2018 M630616] |
WOS关键词 | BURGESS SHALE ; APPENDICULAR ORIGIN ; NERVOUS-SYSTEM ; ARTHROPOD ; EVOLUTION ; HEAD ; MORPHOLOGY ; HOMOLOGY ; CHELICERATA ; AFFINITIES |
WOS研究方向 | Evolutionary Biology ; Genetics & Heredity |
语种 | 英语 |
出版者 | BMC |
WOS记录号 | WOS:000511997200001 |
资助机构 | Chinese Academy of Sciences ; National Natural Science Foundation of China ; President's International Fellowship Initiative grant ; China Postdoctoral Science Foundation |
内容类型 | 期刊论文 |
源URL | [http://ir.nigpas.ac.cn/handle/332004/31397] ![]() |
专题 | 中国科学院南京地质古生物研究所 |
通讯作者 | Zhu, Maoyan (朱茂炎) |
作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Palaeoenvironm, Nanjing 210008, Peoples R China 4.Chengjiang Fossil Site World Heritage, Management Comm, Chengjiang 652599, Peoples R China |
推荐引用方式 GB/T 7714 | Aria, Cedric,Zhao, Fangchen ,Zeng, Han ,et al. Fossils from South China redefine the ancestral euarthropod body plan[J]. BMC EVOLUTIONARY BIOLOGY,2020,20(1):17. |
APA | Aria, Cedric,Zhao, Fangchen ,Zeng, Han ,Guo, Jin,&Zhu, Maoyan .(2020).Fossils from South China redefine the ancestral euarthropod body plan.BMC EVOLUTIONARY BIOLOGY,20(1),17. |
MLA | Aria, Cedric,et al."Fossils from South China redefine the ancestral euarthropod body plan".BMC EVOLUTIONARY BIOLOGY 20.1(2020):17. |
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