Ontogenetic braincase development in Psittacosaurus lujiatunensis (Dinosauria: Ceratopsia) using micro-computed tomography

doi:10.7717/peerj.7217

	Ontogenetic braincase development in Psittacosaurus lujiatunensis (Dinosauria: Ceratopsia) using micro-computed tomography
	Bullar, Claire M.1; Zhao, Qi 1,2; Benton, Michael J.1; Ryan, Michael J.3
刊名	PEERJ
	2019-08-14
卷号	7 页码:51
关键词	Dinosaurs Braincase Ceratopsian Ontogeny Morphology Tomography Psittacosaurus
ISSN号	2167-8359
DOI	10.7717/peerj.7217
通讯作者	Bullar, Claire M.(cb14233@bristol.ac.uk)
英文摘要	Ontogenetic sequences are relatively rare among dinosaurs, with Ceratopsia being one of the better represented clades, and especially among geologically earlier forms, such as Psittacosaurus. Psittacosaurus is a small, bipedal basal ceratopsian abundant in the Lower Cretaceous deposits of Asia, whose cranial and endocranial morphology has been well studied, but only cursory details have been published on the bones surrounding the brain. Using reconstructions created from micro-computed tomography scans of well-preserved skulls from the Barremian-Aptian Yixian Formation, China, we document morphological changes in the braincase of Psittacosaurus lujiatunensis through three growth stages, hatchling, juvenile, and adult, thus providing the first detailed study of ceratopsian braincase morphology through ontogeny. Notable ontogenetic changes in the braincase of P. lujiatunensis include a dramatic relative reduction in size of the supraoccipital, an increase in the lateral expansion of the paroccipital processes and a decrease in the angle between the lateral semicircular canal and the palatal plane. These ontogenetic morphological changes in the braincase relate to expansion of the cranium and brain through growth, as well as reflecting the switch from quadrupedal juveniles to bipedal adults as documented in the changing orientation of the horizontal semicircular canal through ontogeny. Recognition of these patterns in a basal ceratopsian has implications for understanding key events in later ceratopsian evolution, such as the development of the parieto-squamosal frill in derived neoceratopsians.
资助项目	Geological Society of London (William George Fearnsides Fund) ; NERC Standard Grant[NE/I027630/1] ; Newton Advanced Fellowships of the Royal Society[NA160290] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB183030504]
WOS关键词	CRANIAL ANATOMY ; HEAD POSTURE ; TRICERATOPS ; SKULL ; ORIENTATION ; EVOLUTION ; CHINA
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	PEERJ INC
WOS记录号	WOS:000480819100007
资助机构	Geological Society of London (William George Fearnsides Fund) ; NERC Standard Grant ; Newton Advanced Fellowships of the Royal Society ; Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/10160]
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Bullar, Claire M.
作者单位	1.Univ Bristol, Sch Earth Sci, Bristol, Avon, England 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 3.Carleton Univ, Dept Earth Sci, Ottawa, ON, Canada
推荐引用方式 GB/T 7714	Bullar, Claire M.,Zhao, Qi,Benton, Michael J.,et al. Ontogenetic braincase development in Psittacosaurus lujiatunensis (Dinosauria: Ceratopsia) using micro-computed tomography[J]. PEERJ,2019,7:51.
APA	Bullar, Claire M.,Zhao, Qi,Benton, Michael J.,&Ryan, Michael J..(2019).Ontogenetic braincase development in Psittacosaurus lujiatunensis (Dinosauria: Ceratopsia) using micro-computed tomography.PEERJ,7,51.
MLA	Bullar, Claire M.,et al."Ontogenetic braincase development in Psittacosaurus lujiatunensis (Dinosauria: Ceratopsia) using micro-computed tomography".PEERJ 7(2019):51.