A basal ceratopsian with transitional features from the Late Jurassic of northwestern China

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	A basal ceratopsian with transitional features from the Late Jurassic of northwestern China
	Xu, Xing; Forster, Catherine A.; Clark, James M.; Mo, Jinyou; xu@amnh.org
	2006
发表期刊	P R SOC B
ISSN	0962-8452
卷号	273 期号:1598
摘要	Although the Ceratopsia and Pachycephalosauria, two major ornithischian groups, are united as the Marginocephalia, few synapomorphies have been identified due to their highly specialized body-plans. Several studies have linked the Heterodontosauridae with either the Ceratopsia or Marginocephalia, but evidence for these relationships is weak, leading most recent studies to consider the Heterodontosauridae as the basal member of another major ornithischian radiation, the Ornithopoda. Here, we report on a new basal ceratopsian dinosaur, Yinlong downsi gen. et. sp. nov., from the Late Jurassic upper part of the Shishugou Formation of Xinjiang, China. This new ceratopsian displays a series of features transitional between more derived ceratopsians and other ornithischians, shares numerous derived similarities with both the heterodontosaurids and pachycephalosaurians and provides strong evidence supporting a monophyletic Marginocephalia and its close relationship to the Heterodontosauridae. Character distributions along the marginocephalian lineage reveal that, compared to the bipedal Pachycephalosauria, which retained a primitive post-cranial body-plan, the dominantly quadrupedal ceratopsians lost many features and evolved their own characters early in their evolution.
关键词	Early Evolution Ornithischian Dinosaurs
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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/311034/4967
专题	中科院古脊椎所（2000年以后）
通讯作者	xu@amnh.org
推荐引用方式 GB/T 7714	Xu, Xing,Forster, Catherine A.,Clark, James M.,et al. A basal ceratopsian with transitional features from the Late Jurassic of northwestern China[J]. P R SOC B,2006,273(1598).
APA	Xu, Xing,Forster, Catherine A.,Clark, James M.,Mo, Jinyou,&xu@amnh.org.(2006).A basal ceratopsian with transitional features from the Late Jurassic of northwestern China.P R SOC B,273(1598).
MLA	Xu, Xing,et al."A basal ceratopsian with transitional features from the Late Jurassic of northwestern China".P R SOC B 273.1598(2006).

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