Stem sarcopterygians have primitive polybasal fin articulation

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	Stem sarcopterygians have primitive polybasal fin articulation
	Zhu, Min1 ; Yu, Xiaobo 2
	2009-06-23
发表期刊	BIOLOGY LETTERS
卷号	5 期号:3 页码:372-375
文章类型	Article
摘要	Among osteichthyans, basal actinopterygian fishes (e.g. paddlefish and bowfins) have paired fins with three endoskeletal components (pro-, meso- and metapterygia) articulating with polybasal shoulder girdles, while sarcopterygian fishes (lungfish, coelacanths and relatives) have paired fins with one endoskeletal component (metapterygium) articulating with monobasal shoulder girdles. In the fin-limb transition, the origin of the sarcopterygian paired fins triggered new possibilities of fin articulation and movement, and established the proximal segments (stylopod and zeugopod) of the presumptive tetrapod limb. Several authors have stated that the monobasal paired fins in sarcopterygians evolved from a primitive polybasal condition. However, the fossil record has been silent on whether and when the inferred transition took place. Here we describe three-dimensionally preserved shoulder girdles of two stem sarcopterygians (Psarolepis and Achoania) from the Lower Devonian of Yunnan, which demonstrate that stem sarcopterygians have polybasal pectoral fin articulation as in basal actinopterygians. This finding provides a phylogenetic and temporal constraint for studying the origin of the stylopod, which must have originated within the stem sarcopterygian lineage through the loss of the propterygium and mesopterygium.
关键词	Sarcopterygians Fin-limb Transition Stylopod Shoulder Girdle Polybasal Fin Articulation
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	PECTORAL FIN ; TETRAPOD LIMB ; PAIRED FINS ; FISH ; EVOLUTION ; COELACANTH ; ORIGIN
收录类别	SCI
语种	英语
WOS研究方向	Life Sciences & Biomedicine - Other Topics ; Environmental Sciences & Ecology ; Evolutionary Biology
WOS类目	Biology ; Ecology ; Evolutionary Biology
WOS记录号	WOS:000266144300023
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/1894
专题	古低等脊椎动物研究室
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Evolutionary Systemat Vertebrates, Beijing 100044, Peoples R China 2.Kean Univ, Dept Biol Sci, Union, NJ 07083 USA
推荐引用方式 GB/T 7714	Zhu, Min,Yu, Xiaobo. Stem sarcopterygians have primitive polybasal fin articulation[J]. BIOLOGY LETTERS,2009,5(3):372-375.
APA	Zhu, Min,&Yu, Xiaobo.(2009).Stem sarcopterygians have primitive polybasal fin articulation.BIOLOGY LETTERS,5(3),372-375.
MLA	Zhu, Min,et al."Stem sarcopterygians have primitive polybasal fin articulation".BIOLOGY LETTERS 5.3(2009):372-375.

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