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Fossils from South China redefine the ancestral euarthropod body plan
Aria, Cedric1,2; Zhao, Fangchen (赵方臣)1,2; Zeng, Han (曾晗)1,2; Guo, Jin3; Zhu, Maoyan (朱茂炎)1,2,4
2020-01-08
Source PublicationBMC EVOLUTIONARY BIOLOGY
ISSN1471-2148
Volume20Issue:1Pages:17
Abstract

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.

KeywordEuarthropoda Body plan Cambrian Chengjiang Macroevolution Homology
DOI10.1186/s12862-019-1560-7
Indexed BySCI
Language英语
WOS KeywordBURGESS SHALE ; APPENDICULAR ORIGIN ; NERVOUS-SYSTEM ; ARTHROPOD ; EVOLUTION ; HEAD ; MORPHOLOGY ; HOMOLOGY ; CHELICERATA ; AFFINITIES
Funding ProjectChinese 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 Research AreaEvolutionary Biology ; Genetics & Heredity
WOS SubjectEvolutionary Biology ; Genetics & Heredity
WOS IDWOS:000511997200001
Funding OrganizationChinese Academy of Sciences ; National Natural Science Foundation of China ; President's International Fellowship Initiative grant ; China Postdoctoral Science Foundation
PublisherBMC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/31398
Collection中国科学院南京地质古生物研究所
Corresponding AuthorZhu, Maoyan (朱茂炎)
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Palaeoenvironm, Nanjing 210008, Peoples R China
3.Chengjiang Fossil Site World Heritage, Management Comm, Chengjiang 652599, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
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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