New material of the Early Devonian sarcopterygian <i>Styloichthys changae</i> illuminates the origin of cosmine

doi:10.1080/14772019.2024.2432273

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	*New material of the Early Devonian sarcopterygian Styloichthys changae* illuminates the origin of cosmine**
	Cui, Xindong 1,2; Qiao, Tuo 2; Peng, Lijian 3; Zhu, Min2,4,5
	2025-12-31
发表期刊	JOURNAL OF SYSTEMATIC PALAEONTOLOGY
ISSN	1477-2019
卷号	23 期号:1 页码:22
摘要	The Early Devonian sarcopterygian Styloichthys changae provides substantial information to resolve the phylogenetic relationships of early sarcopterygians. Its dermal bones show a cosmine surface with relatively large pores and a unique histological condition, which is essential to understanding the early evolution of the dermoskeleton in sarcopterygians. However, more detailed histological information on this taxon is needed. Here, we present new data about the morphology and histology of dermal bones and scales of S. changae based on two semi-articulated specimens. The scales bear parallel ridges and relatively large pores on their external surface resembling those of the dermal bones, showing an intermediate condition between stem sarcopterygians and crown sarcopterygians. We recognize three stages in the growth series of S. changae scales. The growth pattern of the cosmine layer undergoes two significant changes: from a superpositional pattern to a continuous areal pattern and then to a discontinuous areal pattern. In addition, the new data indicate that the pore-canal system predates the enamel-dentine complex of cosmine. This work supports the hypothesis that the cosmine arose step by step in sarcopterygians and provides more details on the evolutionary development pattern of cosmine.
关键词	Early Devonian sarcopterygian scales cosmine evolution
DOI	10.1080/14772019.2024.2432273
关键词[WOS]	LOPHOSTEUS-SUPERBUS PANDER ; DERMAL SKELETON ; WESTERN-AUSTRALIA ; GANOID SCALES ; FISH ; HISTOLOGY ; MICROSTRUCTURE ; LEPISOSTEUS ; COELACANTH ; POLYPTERUS
收录类别	SCI
语种	英语
资助项目	State Key Laboratory of Palaeobiology and Stratigraphy###3123 ; Mee-mann Chang Academician Workstation in Yunnan Province[223106]###3122 ; Chinese Postdoctoral Science Foundation[202205AF150002]###3121 ; National Natural Science Foundation of China[2024T170012]###3120 ; National Natural Science Foundation of China[2022M720215]###3119 ; National Natural Science Foundation of China[42302005]###3118 ; National Natural Science Foundation of China[42130209]###1686
WOS研究方向	Evolutionary Biology ; Paleontology
WOS类目	Evolutionary Biology ; Paleontology
WOS记录号	WOS:001390710200001
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/311034/24179
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Zhu, Min
作者单位	1.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, CAS Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China 3.Qujing Normal Univ, Res Ctr Nat Hist & Culture, Qujing, Peoples R China 4.Qujing Normal Univ, Res Ctr Nat Hist & Culture, Qujing 655011, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cui, Xindong,Qiao, Tuo,Peng, Lijian,et al. New material of the Early Devonian sarcopterygian Styloichthys changae illuminates the origin of cosmine[J]. JOURNAL OF SYSTEMATIC PALAEONTOLOGY,2025,23(1):22.
APA	Cui, Xindong,Qiao, Tuo,Peng, Lijian,&Zhu, Min.(2025).New material of the Early Devonian sarcopterygian Styloichthys changae illuminates the origin of cosmine.JOURNAL OF SYSTEMATIC PALAEONTOLOGY,23(1),22.
MLA	Cui, Xindong,et al."New material of the Early Devonian sarcopterygian Styloichthys changae illuminates the origin of cosmine".JOURNAL OF SYSTEMATIC PALAEONTOLOGY 23.1(2025):22.

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