New digital anatomical data of <i>Keichousaurus hui</i> (Reptilia: Sauropterygia) and its phylogenetic implication

doi:10.7717/peerj.19012

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	*New digital anatomical data of Keichousaurus hui* (Reptilia: Sauropterygia) and its phylogenetic implication**
	Xu, Jiayu 1; Guo, Yu 2; Ma, Yucong 1; Wang, Wei 3; Cheng, Long 4; Han, Fenglu1
	2025-03-31
发表期刊	PEERJ
ISSN	2167-8359
卷号	13 页码:23
通讯作者	Han, Fenglu(hanfl@cug.edu.cn)
摘要	Three complete skulls of Keichousaurus hui from the Middle Triassic Xingyi Fauna of southwestern China were examined using high-resolution computed tomography (CT) scanning. The CT images allow a few refinements and supplements in cranial anatomy. Some previously ambiguous anatomical characters were identified, including the presence of an L-shaped ectopterygoid that extends from the lateral side of the pterygoid and bends ventrally, the wedge-shaped posterolateral process of the frontal, the trapezoidal pterygoid for articulating with the palatine, and a rodlike basioccipital tuber that extends posterolaterally. These new features provide new detailed anatomical information for taxonomy. The new phylogenetic analysis of Sauropterygiformes places Keichousaurus as an eosauropterygian that is more basal than the monophyly which includes Nothosauridae and Pistosauroidea. Moreover, the result also suggests that Keichousaurus is more closely related to Chinese pachypleurosaurs-like eosauropterygians than to European pachypleurosaurs and more derived than other Chinese pachypleurosaurs-like forms.
关键词	Keichousaurus hui Marine reptile Middle Triassic Skull morphology Pachypleurosauria China
DOI	10.7717/peerj.19012
关键词[WOS]	EOSAUROPTERYGIAN DIAPSIDA SAUROPTERYGIA ; SEXUAL-DIMORPHISM ; CRANIAL ANATOMY ; MIDDLE ; PACHYPLEUROSAUR ; YUNNAN ; INFORMATION ; PLACODONTIA ; SIMOSAURUS ; MORPHOLOGY
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China ; Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences and Yinghua NDT (Shanghai) Co., Ltd.
项目资助者	National Natural Science Foundation of China ; Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences and Yinghua NDT (Shanghai) Co., Ltd.
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001468781800001
出版者	PEERJ INC
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/24733
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Han, Fenglu
作者单位	1.China Univ Geosci, Sch Earth Sci, Wuhan, Hubei, Peoples R China 2.Geol Museum China, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 4.China Geol Survey, Hubei Key Lab Paleontol & Geol Environm Evolut, Wuhan Ctr, Wuhan, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Xu, Jiayu,Guo, Yu,Ma, Yucong,et al. New digital anatomical data of Keichousaurus hui (Reptilia: Sauropterygia) and its phylogenetic implication[J]. PEERJ,2025,13:23.
APA	Xu, Jiayu,Guo, Yu,Ma, Yucong,Wang, Wei,Cheng, Long,&Han, Fenglu.(2025).New digital anatomical data of Keichousaurus hui (Reptilia: Sauropterygia) and its phylogenetic implication.PEERJ,13,23.
MLA	Xu, Jiayu,et al."New digital anatomical data of Keichousaurus hui (Reptilia: Sauropterygia) and its phylogenetic implication".PEERJ 13(2025):23.