A new cyamodontoid placodont from Triassic of Guizhou, China

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	A new cyamodontoid placodont from Triassic of Guizhou, China
	Li, C; Rieppel, O ; Li, C (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleonanthropol, Beijing 100044, Peoples R China.
	2002-03-01
发表期刊	CHINESE SCIENCE BULLETIN
ISSN	1001-6538
卷号	47 期号:5 页码:403-+
文章类型	Article
摘要	A new cyamodontoid placodont is named (Psephochelys polyosteoderma gen. et. sp. nov.) and described based on a three-dimensionally preserved specimen. The material comes from the Wayao Member of the Falang Formation (Carnian, Late Triassic) in Guizhou Province, southwestern China. The skull of Psephochelys shows a unique combination of characteristics observed in Psephoderma and Placochelys, and the carapace is diagnostic of a new taxon as well. The ventral dermal armor of Psephochelys differs from all other known cyamodontoids in that it comprises irregular marginal osteoderms in loose contact with each other, and gastralia between them. The cranial suture pattern is in part difficult to analyze due to apparent co-ossification of elements, or poor delimitation of sutures. This affects primarily the demarcation of the nasal from the prefrontal, and the relation between the anterior part of the parietal, posterior ends of the frontals, and postfrontals. However, the postfrontal appears to enter the anteromedial margin of the upper temporal fenestra, a characteristic otherwise known from Placodus, but not from other cyamodontoids. However, given the difficulties of interpretation of this skull, additional material is required to unequivocally assess some details of the pattern of cranial sutures.; A new cyamodontoid placodont is named (Psephochelys polyosteoderma gen. et. sp. nov.) and described based on a three-dimensionally preserved specimen. The material comes from the Wayao Member of the Falang Formation (Carnian, Late Triassic) in Guizhou Province, southwestern China. The skull of Psephochelys shows a unique combination of characteristics observed in Psephoderma and Placochelys, and the carapace is diagnostic of a new taxon as well. The ventral dermal armor of Psephochelys differs from all other known cyamodontoids in that it comprises irregular marginal osteoderms in loose contact with each other, and gastralia between them. The cranial suture pattern is in part difficult to analyze due to apparent co-ossification of elements, or poor delimitation of sutures. This affects primarily the demarcation of the nasal from the prefrontal, and the relation between the anterior part of the parietal, posterior ends of the frontals, and postfrontals. However, the postfrontal appears to enter the anteromedial margin of the upper temporal fenestra, a characteristic otherwise known from Placodus, but not from other cyamodontoids. However, given the difficulties of interpretation of this skull, additional material is required to unequivocally assess some details of the pattern of cranial sutures.
关键词	Placodont Triassic Guizhou
WOS标题词	Science & Technology
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000175218600011
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3807
专题	中科院古脊椎所（2000年以后）古低等脊椎动物研究室
通讯作者	Li, C (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleonanthropol, Beijing 100044, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleonanthropol, Beijing 100044, Peoples R China 2.Field Museum, Chicago, IL 60605 USA
推荐引用方式 GB/T 7714	Li, C,Rieppel, O,Li, C . A new cyamodontoid placodont from Triassic of Guizhou, China[J]. CHINESE SCIENCE BULLETIN,2002,47(5):403-+.
APA	Li, C,Rieppel, O,&Li, C .(2002).A new cyamodontoid placodont from Triassic of Guizhou, China.CHINESE SCIENCE BULLETIN,47(5),403-+.
MLA	Li, C,et al."A new cyamodontoid placodont from Triassic of Guizhou, China".CHINESE SCIENCE BULLETIN 47.5(2002):403-+.

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