New psittacosaurid highlights skull enlargement in homed dinosaurs

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	New psittacosaurid highlights skull enlargement in homed dinosaurs
	Sereno, Paul C.; Zhao Xijin ; Brown, Lorin ; Lin, Tan ; Sereno, PC (reprint author), Univ Chicago, Dept Organismal Biol & Anat, 1027 E 57th St, Chicago, IL 60637 USA.
	2007-06-01
发表期刊	ACTA PALAEONTOLOGICA POLONICA
ISSN	0567-7920
卷号	52 期号:2 页码:275-284
文章类型	Article
摘要	A new psittacosaurid is based on a nearly complete articulated skeleton from northeastern China that differs principally in skull size as compared to the most common and widespread species, Psittacosaurus mongolielisis. The skull of Psittacosauris major sp. nov., is 25% larger despite very similar postcranial skeletal dimensions. Such selective skull enlargement is very unusual. Skull size in ceratopsians. in general, scales with positive allometry relative to body mass: species of greater mass have proportionately larger skulls. This pattern stands in marked contrast to that for other vertebrate herbivores. in which larger-bodied species either have proportionately similar or smaller skulls relative to body mass. Larger-bodied ceratopsians evolved skulls that are 50% or more of trunk length-as measured without their expansive cranial frill. Although contemporaneous duck-billed dinosaurs also exhibit some positive allometry in the skull, skull length remains approximately 35% of trunk length. The evolution of extraordinary absolute and relative skull size among ceratopsians appears to have been driven by sexual selection and involved the tandem evolution of reduced head mobility and ail obligate quadrupedal posture.; A new psittacosaurid is based on a nearly complete articulated skeleton from northeastern China that differs principally in skull size as compared to the most common and widespread species, Psittacosaurus mongolielisis. The skull of Psittacosauris major sp. nov., is 25% larger despite very similar postcranial skeletal dimensions. Such selective skull enlargement is very unusual. Skull size in ceratopsians. in general, scales with positive allometry relative to body mass: species of greater mass have proportionately larger skulls. This pattern stands in marked contrast to that for other vertebrate herbivores. in which larger-bodied species either have proportionately similar or smaller skulls relative to body mass. Larger-bodied ceratopsians evolved skulls that are 50% or more of trunk length-as measured without their expansive cranial frill. Although contemporaneous duck-billed dinosaurs also exhibit some positive allometry in the skull, skull length remains approximately 35% of trunk length. The evolution of extraordinary absolute and relative skull size among ceratopsians appears to have been driven by sexual selection and involved the tandem evolution of reduced head mobility and ail obligate quadrupedal posture.
关键词	Dinosauria Ornithischia Marginocephalia Psittacosaurus Cretaceous Yixian Formation China
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	NEW-MEXICO ; RECONSTRUCTION ; ORNITHISCHIA ; EVOLUTION ; SKELETAL ; ALBERTA ; CHINA ; SIZE
收录类别	SCI
语种	英语
WOS研究方向	Paleontology
WOS类目	Paleontology
WOS记录号	WOS:000247807800004
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3347
专题	中科院古脊椎所（2000年以后）
通讯作者	Sereno, PC (reprint author), Univ Chicago, Dept Organismal Biol & Anat, 1027 E 57th St, Chicago, IL 60637 USA.
作者单位	1.Univ Chicago, Dept Organismal Biol & Anat, Chicago, IL 60637 USA 2.Acad Sinica, Inst Vertebrate Paleontol & Paleonanthropol, Beijing 100044, Peoples R China 3.Long Hao Geol & Paleontol Res Ctr, Bur Land & Resources, Hohhot 010010, Nei Mongol, Peoples R China
推荐引用方式 GB/T 7714	Sereno, Paul C.,Zhao Xijin,Brown, Lorin,et al. New psittacosaurid highlights skull enlargement in homed dinosaurs[J]. ACTA PALAEONTOLOGICA POLONICA,2007,52(2):275-284.
APA	Sereno, Paul C.,Zhao Xijin,Brown, Lorin,Lin, Tan,&Sereno, PC .(2007).New psittacosaurid highlights skull enlargement in homed dinosaurs.ACTA PALAEONTOLOGICA POLONICA,52(2),275-284.
MLA	Sereno, Paul C.,et al."New psittacosaurid highlights skull enlargement in homed dinosaurs".ACTA PALAEONTOLOGICA POLONICA 52.2(2007):275-284.

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