<i>Deanaspis</i>, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications

doi:10.1080/14772019.2025.2460479

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	Deanaspis, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications
	Lin, Xianghong 1,2; Zan, Chaoyao 3,4; Gai, Zhikun 1,4; Zhu, Min1,4
	2025-12-31
发表期刊	JOURNAL OF SYSTEMATIC PALAEONTOLOGY
ISSN	1477-2019
卷号	23 期号:1 页码:14
通讯作者	Gai, Zhikun(gaizhikun@ivpp.ac.cn)
摘要	A new genus and species of Galeaspida, Deanaspis longpingi gen. et sp. nov., is described from a new locality of the Silurian Xikeng Formation (from around 436 million years ago) in De'an County, Jiangxi Province. The new taxon possesses the mosaic characters of Eugaleaspiformes and Xiushuiaspidae, such as the longitudinal oval median dorsal opening in Eugealeaspiformes and the presence of the long postbranchial division of the headshied in Xiushuiaspidae. Accordingly, we erect a new family, Deanaspidae fam. nov., characterized by the longitudinal oval median dorsal opening and the long postbranchial division of the headshield covering the anterior part of the body. Our phylogenetic analysis indicates that Xiushuiaspis, Changxingaspis and Xiyuichthys form a monophyletic group, the family Xiushuiaspidae, and Deanaspidae is resolved to be the sister group of Xiushuiaspidae. Our results reveal that the long postbranchial division of Xiushuiaspidae and Deanaspidae is convergent with the inter-branchial region in polybranchiaspid galeaspids, but can be compared to the postbranchial region in some osteostracans, heterostracans and pituriaspids, and the thoracic armour of placoderms, which protects the viscera in the anterior part of the trunk.https://zoobank.org/urn:lsid:zoobank.org:pub:478B6681-44E7-4430-B91A-76E48C8FE54D
关键词	Galeaspida Agnatha stem gnathostomes Silurian anatomy phylogeny
DOI	10.1080/14772019.2025.2460479
关键词[WOS]	VERTEBRATES ; AGNATHA ; FAMILY
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China ; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences[42130209] ; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences[92255301] ; National Natural Science Foundation of China[202205AF150002] ; Mee-mann Chang Academician Workstation in Yunnan Province
项目资助者	National Natural Science Foundation of China ; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; National Natural Science Foundation of China ; Mee-mann Chang Academician Workstation in Yunnan Province
WOS研究方向	Evolutionary Biology ; Paleontology
WOS类目	Evolutionary Biology ; Paleontology
WOS记录号	WOS:001445489600001
出版者	TAYLOR & FRANCIS LTD
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/24299
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Gai, Zhikun
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China 2.Yunnan Univ, Inst Palaeontol, Yunnan Key Lab Palaeobiol, Kunming, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Lin, Xianghong,Zan, Chaoyao,Gai, Zhikun,et al. Deanaspis, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications[J]. JOURNAL OF SYSTEMATIC PALAEONTOLOGY,2025,23(1):14.
APA	Lin, Xianghong,Zan, Chaoyao,Gai, Zhikun,&Zhu, Min.(2025).Deanaspis, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications.JOURNAL OF SYSTEMATIC PALAEONTOLOGY,23(1),14.
MLA	Lin, Xianghong,et al."Deanaspis, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications".JOURNAL OF SYSTEMATIC PALAEONTOLOGY 23.1(2025):14.