New psittacosaurid highlights skull enlargement in homed dinosaurs

IVPP-IR > 中科院古脊椎所（2000年以后）

	New psittacosaurid highlights skull enlargement in homed dinosaurs
	Sereno, Paul C.; Zhao Xijin; Brown, Lorin; Lin, Tan; dinosaur@uchicago.edu
	2007
发表期刊	ACTA PALAEONTOL POL
ISSN	0567-7920
卷号	52 期号:2 页码:275-284
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.
关键词	New-mexico Reconstruction Ornithischia Evolution Skeletal Alberta China Size
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4915
专题	中科院古脊椎所（2000年以后）
通讯作者	dinosaur@uchicago.edu
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 PALAEONTOL POL,2007,52(2):275-284.
APA	Sereno, Paul C.,Zhao Xijin,Brown, Lorin,Lin, Tan,&dinosaur@uchicago.edu.(2007).New psittacosaurid highlights skull enlargement in homed dinosaurs.ACTA PALAEONTOL POL,52(2),275-284.
MLA	Sereno, Paul C.,et al."New psittacosaurid highlights skull enlargement in homed dinosaurs".ACTA PALAEONTOL POL 52.2(2007):275-284.

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