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An early Cambrian euarthropod with radiodont-like raptorial appendages
Zeng, Han (曾晗)1,2,3; Zhao, Fangchen (赵方臣)1,2,4; Niu, Kecheng5; Zhu, Maoyan (朱茂炎)1,2,4; Huang, Diying (黄迪颖)1,2
2020-11-04
Source PublicationNATURE
ISSN0028-0836
Pages20
Abstract

Kylinxia zhangi is a transitional fossil that is an evolutionary 'missing link' between radiodonts (also known as anomalocaridids) and true arthropods, providing insights into the origin and early evolution of Arthropoda. Resolving the early evolution of euarthropods is one of the most challenging problems in metazoan evolution(1,2). Exceptionally preserved fossils from the Cambrian period have contributed important palaeontological data to deciphering this evolutionary process(3,4). Phylogenetic studies have resolved Radiodonta (also known as anomalocaridids) as the closest group to all euarthropods that have frontalmost appendages on the second head segment (Deuteropoda)(5-9). However, the interrelationships among major Cambrian euarthropod groups remain disputed(1,2,4,7), which impedes our understanding of the evolutionary gap between Radiodonta and Deuteropoda. Here we describe Kylinxia zhangi gen. et. sp. nov., a euarthropod from the early Cambrian Chengjiang biota of China. Kylinxia possesses not only deuteropod characteristics such as a fused head shield, a fully arthrodized trunk and jointed endopodites, but also five eyes (as in Opabinia) as well as radiodont-like raptorial frontalmost appendages. Our phylogenetic reconstruction recovers Kylinxia as a transitional taxon that bridges Radiodonta and Deuteropoda. The most basal deuteropods are retrieved as a paraphyletic lineage that features plesiomorphic raptorial frontalmost appendages and includes Kylinxia, megacheirans, panchelicerates, 'great-appendage' bivalved euarthropods and isoxyids. This phylogenetic topology supports the idea that the radiodont and megacheiran frontalmost appendages are homologous, that the chelicerae of Chelicerata originated from megacheiran great appendages and that the sensorial antennae in Mandibulata derived from ancestral raptorial forms. Kylinxia thus provides important insights into the phylogenetic relationships among early euarthropods, the evolutionary transformations and disparity of frontalmost appendages, and the origin of crucial evolutionary innovations in this clade.

DOI10.1038/s41586-020-2883-7
Indexed BySCI
Language英语
WOS KeywordBURGESS SHALE ; CHENGJIANG BIOTA ; ARTHROPOD ; EVOLUTION ; ORIGIN ; MORPHOLOGY ; PHYLOGENY ; ONTOGENY ; HOMOLOGY ; ISOXYS
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB26000000] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41921002] ; National Natural Science Foundation of China[41902014] ; National Natural Science Foundation of China[41925008] ; Jiangsu Basic Research Project[BK20191102] ; State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS[20192111] ; State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS[20181105] ; IGCP Project[668] ; Smithsonian post-doctoral fellowship
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000585787700002
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Jiangsu Basic Research Project ; State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS ; IGCP Project ; Smithsonian post-doctoral fellowship
PublisherNATURE RESEARCH
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32716
Collection中国科学院南京地质古生物研究所
Corresponding AuthorZhao, Fangchen (赵方臣); Huang, Diying (黄迪颖)
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Palaeoenvironm, Nanjing, Peoples R China
3.Smithsonian Inst, Natl Museum Amer Hist, Dept Paleobiol, Washington, DC 20560 USA
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
5.Yingliang Stone Nat Hist Museum, Nanan, 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
Zeng, Han ,Zhao, Fangchen ,Niu, Kecheng,et al. An early Cambrian euarthropod with radiodont-like raptorial appendages[J]. NATURE,2020:20.
APA Zeng, Han ,Zhao, Fangchen ,Niu, Kecheng,Zhu, Maoyan ,&Huang, Diying .(2020).An early Cambrian euarthropod with radiodont-like raptorial appendages.NATURE,20.
MLA Zeng, Han ,et al."An early Cambrian euarthropod with radiodont-like raptorial appendages".NATURE (2020):20.
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