Stem sarcopterygians have primitive polybasal fin articulation

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	Stem sarcopterygians have primitive polybasal fin articulation
	Zhu, Min; Yu, Xiaobo; zhumin@ivpp.ac.cn
	2009
发表期刊	BIOL LETTERS
ISSN	1744-9561
卷号	5 期号:3 页码:372—375
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	Pectoral Fin Tetrapod Limb Paired Fins Fish Evolution Coelacanth Origin
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收录类别	SCI收录
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4733
专题	中科院古脊椎所（2000年以后）
通讯作者	zhumin@ivpp.ac.cn
推荐引用方式 GB/T 7714	Zhu, Min,Yu, Xiaobo,zhumin@ivpp.ac.cn. Stem sarcopterygians have primitive polybasal fin articulation[J]. BIOL LETTERS,2009,5(3):372—375.
APA	Zhu, Min,Yu, Xiaobo,&zhumin@ivpp.ac.cn.(2009).Stem sarcopterygians have primitive polybasal fin articulation.BIOL LETTERS,5(3),372—375.
MLA	Zhu, Min,et al."Stem sarcopterygians have primitive polybasal fin articulation".BIOL LETTERS 5.3(2009):372—375.

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