The Evolution of the Spiracular Region From Jawless Fishes to Tetrapods

doi:10.3389/fevo.2022.887172

IVPP-IR > 中科院古脊椎所（2000年以后）

	The Evolution of the Spiracular Region From Jawless Fishes to Tetrapods
	Gai, Zhikun 1,2,3; Zhu, Min1,2,3 ; Ahlberg, Per E.4; Donoghue, Philip C. J.5
	2022-05-19
发表期刊	FRONTIERS IN ECOLOGY AND EVOLUTION
ISSN	2296-701X
卷号	10 期号:887172 页码:17
摘要	The spiracular region, comprising the hyomandibular pouch together with the mandibular and hyoid arches, has a complex evolutionary history. In living vertebrates, the embryonic hyomandibular pouch may disappear in the adult, develop into a small opening between the palatoquadrate and hyomandibula containing a single gill-like pseudobranch, or create a middle ear cavity, but it never develops into a fully formed gill with two hemibranchs. The belief that a complete spiracular gill must be the ancestral condition led some 20th century researchers to search for such a gill between the mandibular and hyoid arches in early jawed vertebrates. This hypothesized ancestral state was named the aphetohyoidean condition, but so far it has not been verified in any fossil; supposed examples, such as in the acanthodian Acanthodes and symmoriid chondrichthyans, have been reinterpreted and discounted. Here we present the first confirmed example of a complete spiracular gill in any vertebrate, in the galeaspid (jawless stem gnathostome) Shuyu. Comparisons with two other groups of jawless stem gnathostomes, osteostracans and heterostracans, indicate that they also probably possessed full-sized spiracular gills and that this condition may thus be primitive for the gnathostome stem group. This contrasts with the living jawless cyclostomes, in which the mandibular and hyoid arches are strongly modified and the hyomandibular pouch is lost in the adult. While no truly aphetohyoidean spiracular gill has been found in any jawed vertebrate, the recently reported presence in acanthodians of two pseudobranchs suggests a two-step evolutionary process whereby initial miniaturization of the spiracular gill was followed, independently in chondrichthyans and osteichthyans, by the loss of the anterior pseudobranch. On the basis of these findings we present an overview of spiracular evolution among vertebrates.
关键词	spiracle mandibular arch hyoid arch Galeaspida stem-gnathostome Shuyu
DOI	10.3389/fevo.2022.887172
关键词[WOS]	GILL VENTILATION ; MIDDLE-EAR ; PHYLOGENETIC POSITION ; ACANTHOSTEGA-GUNNARI ; SHEDS LIGHT ; ORIGIN ; PLACODERM ; FOSSIL ; VERTEBRATES ; AGNATHA
收录类别	SCI
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000805629100001
出版者	FRONTIERS MEDIA SA
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/21619
专题	中科院古脊椎所（2000年以后）
通讯作者	Ahlberg, Per E.; Donoghue, Philip C. J.
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China 2.Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 4.Uppsala Univ, Dept Organismal Biol, Uppsala, Sweden 5.Univ Bristol, Sch Earth Sci, Bristol Palaeobiol Grp, Bristol, England
推荐引用方式 GB/T 7714	Gai, Zhikun,Zhu, Min,Ahlberg, Per E.,et al. The Evolution of the Spiracular Region From Jawless Fishes to Tetrapods[J]. FRONTIERS IN ECOLOGY AND EVOLUTION,2022,10(887172):17.
APA	Gai, Zhikun,Zhu, Min,Ahlberg, Per E.,&Donoghue, Philip C. J..(2022).The Evolution of the Spiracular Region From Jawless Fishes to Tetrapods.FRONTIERS IN ECOLOGY AND EVOLUTION,10(887172),17.
MLA	Gai, Zhikun,et al."The Evolution of the Spiracular Region From Jawless Fishes to Tetrapods".FRONTIERS IN ECOLOGY AND EVOLUTION 10.887172(2022):17.

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