THE ORIGIN OF THE VERTEBRATE JAW: INTERSECTION BETWEEN DEVELOPMENTAL BIOLOGY-BASED MODEL AND FOSSIL EVIDENCE

IVPP-IR > 中科院古脊椎所（2000年以后）

	THE ORIGIN OF THE VERTEBRATE JAW: INTERSECTION BETWEEN DEVELOPMENTAL BIOLOGY-BASED MODEL AND FOSSIL EVIDENCE
	Gai Zhikun; Zhu Min; [email protected]
	2012
发表期刊	JOURNAL OF VERTEBRATE PALEONTOLOGY
ISSN	1001-6538
卷号	32 期号:30 页码:98-98
文章类型	Meeting Abstract
摘要	The origin of the vertebrate jaw has been reviewed based on the molecular, developmental and paleontological evidences. Advances in developmental genetics have accumulated to propose the heterotopy theory of jaw evolution, i.e. the jaw evolved as a novelty through a heterotopic shift of mesenchyme-epithelial interaction. According to this theory, the disassociation of the nasohypophyseal complex is a fundamental prerequisite for the origin of the jaw, since the median position of the nasohypophyseal placode in cyclostome head development precludes the forward growth of the neural-crest-derived craniofacial ectomesenchyme. The potential impacts of this disassociation on the origin of the diplorhiny are also discussed from the molecular perspectives. Thus far, our study on the cranial anatomy of galeaspids, a 435-370-million-year-old 'ostracoderm' group from China and northern Vietnam, has provided the earliest fossil evidence for the disassociation of nasohypophyseal complex in vertebrate phylogeny. Using Synchrotron Radiation X-ray Tomography, we further show some derivative structures of the trabeculae (e.g. orbitonasal lamina, ethmoid plate) in jawless galeaspids, which provide new insights into the reorganization of the vertebrate head before the evolutionary origin of the jaw. These anatomical observations based on new techniques highlight the possibility that galeaspids are, in many respects, a better proxy than osteostracans for reconstructing the pre-gnathostome condition of the rostral part of the braincase. The cranial anatomy of galeaspids reveals a number of derived characters uniquely shared with gnathostomes. This raises the potential possibility that galeaspids might be the closest jawless relatives of jawed vertebrates. Our study provides an intriguing example of intersection between developmental biology-based model and fossil evidence.
关键词	Jaw Agnathans Gnathostomes Galeaspids Trabecula Evolutionary Developmental Biology
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
URL	查看原文
关键词[WOS]	NEURAL CREST ; COMPARATIVE EMBRYOLOGY ; CAMBRIAN VERTEBRATES ; EVOLUTION ; LAMPREY ; CHARACTERS ; HEDGEHOG ; CHINA ; HEAD ; GNATHOSTOMES
收录类别	SCI ; ISTP
语种	英语
WOS研究方向	Paleontology
WOS类目	Paleontology
WOS记录号	WOS:000313496400200
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4259
专题	中科院古脊椎所（2000年以后）
通讯作者	[email protected]
作者单位	Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Gai Zhikun,Zhu Min,[email protected]. THE ORIGIN OF THE VERTEBRATE JAW: INTERSECTION BETWEEN DEVELOPMENTAL BIOLOGY-BASED MODEL AND FOSSIL EVIDENCE[J]. JOURNAL OF VERTEBRATE PALEONTOLOGY,2012,32(30):98-98.
APA	Gai Zhikun,Zhu Min,[email protected].(2012).THE ORIGIN OF THE VERTEBRATE JAW: INTERSECTION BETWEEN DEVELOPMENTAL BIOLOGY-BASED MODEL AND FOSSIL EVIDENCE.JOURNAL OF VERTEBRATE PALEONTOLOGY,32(30),98-98.
MLA	Gai Zhikun,et al."THE ORIGIN OF THE VERTEBRATE JAW: INTERSECTION BETWEEN DEVELOPMENTAL BIOLOGY-BASED MODEL AND FOSSIL EVIDENCE".JOURNAL OF VERTEBRATE PALEONTOLOGY 32.30(2012):98-98.

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