The origin of the internal nostril of tetrapods

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	The origin of the internal nostril of tetrapods
	Zhu, M ; Ahlberg, PE ; Zhu, M (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, POB 643, Beijing 100044, Peoples R China.
刊名	NATURE
	2004-11-04
卷号	432 期号:7013 页码:94-97
ISSN号	0028-0836
文献子类	Article
英文摘要	The choana, a unique 'internal nostril' opening from the nasal sac into the roof of the mouth, is a key part of the tetrapod ( land vertebrate) respiratory system. It was the first component of the tetrapod body plan to evolve, well before the origin of limbs, and is therefore crucial to our understanding of the beginning of the fish - tetrapod transition. However, there is no consensus on the origin of the choana despite decades of heated debate(1-9); some have claimed that it represents a palatally displaced external nostril(4,6), but others have argued that this is implausible because it implies breaking and rejoining the maxillary - premaxillary dental arcade and the maxillary branch of nerve V(2,6). The fossil record has not resolved the dispute, because the choana is fully developed in known tetrapod stem-group members(8,10,11). Here we present new material of Kenichthys, a 395-million-year-old fossil fish from China(12-14), that provides direct evidence for the origin of the choana and establishes its homology: it is indeed a displaced posterior external nostril that, during a brief transitional stage illustrated by Kenichthys, separated the maxilla from the premaxilla.; The choana, a unique 'internal nostril' opening from the nasal sac into the roof of the mouth, is a key part of the tetrapod ( land vertebrate) respiratory system. It was the first component of the tetrapod body plan to evolve, well before the origin of limbs, and is therefore crucial to our understanding of the beginning of the fish - tetrapod transition. However, there is no consensus on the origin of the choana despite decades of heated debate(1-9); some have claimed that it represents a palatally displaced external nostril(4,6), but others have argued that this is implausible because it implies breaking and rejoining the maxillary - premaxillary dental arcade and the maxillary branch of nerve V(2,6). The fossil record has not resolved the dispute, because the choana is fully developed in known tetrapod stem-group members(8,10,11). Here we present new material of Kenichthys, a 395-million-year-old fossil fish from China(12-14), that provides direct evidence for the origin of the choana and establishes its homology: it is indeed a displaced posterior external nostril that, during a brief transitional stage illustrated by Kenichthys, separated the maxilla from the premaxilla.
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WOS关键词	POROLEPIFORMES
WOS研究方向	Science & Technology - Other Topics
语种	英语
WOS记录号	WOS:000224854900046
公开日期	2013-11-27
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/3598]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Zhu, M (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, POB 643, Beijing 100044, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 2.Uppsala Univ, Evolutionary Biol Ctr, Dept Evolutionary Organismal Biol, SE-75236 Uppsala, Sweden
推荐引用方式 GB/T 7714	Zhu, M,Ahlberg, PE,Zhu, M . The origin of the internal nostril of tetrapods[J]. NATURE,2004,432(7013):94-97.
APA	Zhu, M,Ahlberg, PE,&Zhu, M .(2004).The origin of the internal nostril of tetrapods.NATURE,432(7013),94-97.
MLA	Zhu, M,et al."The origin of the internal nostril of tetrapods".NATURE 432.7013(2004):94-97.