A Silurian placoderm with osteichthyan-like marginal jaw bones

CORC > 古脊椎动物与古人类研究所 > 中国科学院古脊椎动物与古人类研究所 > 古低等脊椎动物研究室

	A Silurian placoderm with osteichthyan-like marginal jaw bones
	Zhu, Min
刊名	NATURE
	2013
卷号	502 期号:7470 页码:188—+
关键词	FISHES PTYCTODONTIDA INFORMATION INFERENCE MRBAYES ORIGIN
ISSN号	0028-0836
通讯作者	zhumin@ivpp.ac.cn
英文摘要	The gnathostome (jawed vertebrate) crown group comprises two extant clades with contrasting character complements. Notably, Chondrichthyes (cartilaginous fish) lack the large dermal bones that characterize Osteichthyes (bony fish and tetrapods). The polarities of these differences, and the morphology of the last common ancestor of crown gnathostomes, are the subject of continuing debate. Here we describe a three-dimensionally preserved 419-million-year-old placoderm fish from the Silurian of China that represents the first stem gnathostome with dermal marginal jaw bones (premaxilla, maxilla and dentary), features previously restricted to Osteichthyes. A phylogenetic analysis places the new form near the top of the gnathostome stem group but does not fully resolve its relationships to other placoderms. The analysis also assigns all acanthodians to the chondrichthyan stem group. These results suggest that the last common ancestor of Chondrichthyes and Osteichthyes had a macromeric dermal skeleton, and provide a new framework for studying crown gnathostome divergence.
收录类别	SCI收录
原文出处	10.1038/nature12617
公开日期	2013-11-27
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/4104]
专题	古脊椎动物与古人类研究所_古低等脊椎动物研究室
推荐引用方式 GB/T 7714	Zhu, Min. A Silurian placoderm with osteichthyan-like marginal jaw bones[J]. NATURE,2013,502(7470):188—+.
APA	Zhu, Min.(2013).A Silurian placoderm with osteichthyan-like marginal jaw bones.NATURE,502(7470),188—+.
MLA	Zhu, Min."A Silurian placoderm with osteichthyan-like marginal jaw bones".NATURE 502.7470(2013):188—+.