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FIRST SUBADULT SPECIMEN OF PSEPHOCHELYS POLYOSTEODERMA (SAUROPTERYGIA, PLACODONTIA) IMPLIES TURTLE-LIKE FUSION PATTERN OF THE CARAPACE

文献类型：期刊论文

作者Wang, Wei1,2; Ma, Feimin3; Li, Chun2
刊名PAPERS IN PALAEONTOLOGY
出版日期2019-12-23
页码14
关键词Placodontia Triassic Placochelyidae Psephochelys polyosteoderma carapace
ISSN号2056-2799
DOI10.1002/spp2.1293
通讯作者Wang, Wei(wangwei2014@ivpp.ac.cn)
英文摘要Placodonts are a group of turtle-like animals, including placochelyids that are restricted entirely to the Triassic Tethyan realm. Their fossil remains are rare compared with other contemporaneous marine reptiles. Here, we report the first subadult specimen of the placochelyid Psephochelys polyosteoderma from south-western China. It is the most complete specimen of this taxon known. The new fossil is referred confidently to Psephochelys polyosteoderma on the basis of the narrow and spatulate rostrum, toothless premaxiliac, and carapace composed of small and numerous armour plates with relatively smooth surfaces. The new specimen provides additional anatomical information for Psephochelys polyosteoderma including the presence of transverse processes on the dorsal vertebrae lacking anteroposterior expansion, and a phalangeal formula in the pes of 1-2-3-4-2. The phylogeny of placodonts, especially the family Placochelyidae, is revised based on a character matrix incorporating additional postcranial characters. This resulted in a betterresolved tree when compared with previous studies, with Psephochelys as a derived genus within Placochelyidae. On comparison with the adult holotype specimen, the incompletely developed armour in the new specimen reveals a fusion pattern of the carapace beginning with the axial and marginal regions. This surface fusion pattern resembles the ontogenetic process in the embryonic turtle shell, hinting at a possible deep homology with their common diapsid ancestor.
WOS关键词TRIASSIC STEM-TURTLE ; PHYLOGENY ; GUIZHOU ; EVOLUTION ; REPTILIA ; CHINA
资助项目Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China (NSFC)[41772006] ; University of Chinese Academy of Sciences Joint PhD Training Program[UCAS [2015]37]
WOS研究方向Paleontology
语种英语
WOS记录号WOS:000504205500001
出版者WILEY
资助机构Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; University of Chinese Academy of Sciences Joint PhD Training Program
源URL[http://119.78.100.205/handle/311034/16845]  
专题古脊椎动物与古人类研究所_图书馆1
通讯作者Wang, Wei
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, CAS Ctr Excellence Life & Paleoenvironm, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China
3.Erenhot Museum, Nei Mongol 011199, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Wei,Ma, Feimin,Li, Chun. FIRST SUBADULT SPECIMEN OF PSEPHOCHELYS POLYOSTEODERMA (SAUROPTERYGIA, PLACODONTIA) IMPLIES TURTLE-LIKE FUSION PATTERN OF THE CARAPACE[J]. PAPERS IN PALAEONTOLOGY,2019:14.
APA Wang, Wei,Ma, Feimin,&Li, Chun.(2019).FIRST SUBADULT SPECIMEN OF PSEPHOCHELYS POLYOSTEODERMA (SAUROPTERYGIA, PLACODONTIA) IMPLIES TURTLE-LIKE FUSION PATTERN OF THE CARAPACE.PAPERS IN PALAEONTOLOGY,14.
MLA Wang, Wei,et al."FIRST SUBADULT SPECIMEN OF PSEPHOCHELYS POLYOSTEODERMA (SAUROPTERYGIA, PLACODONTIA) IMPLIES TURTLE-LIKE FUSION PATTERN OF THE CARAPACE".PAPERS IN PALAEONTOLOGY (2019):14.

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来源：古脊椎动物与古人类研究所

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