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A juvenile specimen of Sinoconodon rigneyi with new information on pattern of tooth replacement

文献类型：期刊论文

作者Hai, Lun1,2; Wang, Yi3; Wang, Haibing1; Gao, Yuan2; Zhu, Zifan1,4; You, Hailu1,4; Wang, Yuanqing1,4
刊名JOURNAL OF VERTEBRATE PALEONTOLOGY
出版日期2024-07-03
页码7
ISSN号0272-4634
DOI10.1080/02724634.2024.2442473
通讯作者Wang, Haibing(wanghaibing@ivpp.ac.cn)
英文摘要Sinoconodon, an early branching mammaliaform from the Early Jurassic, showcases a unique combination of both plesiomorphic (e.g., sustained and indeterminate growth, over two replacements of teeth) and derived features of mammaliaforms (e.g., jaw joint formed by the squamosal glenoid and dentary condyle, a shallow postdentary trough). Ontogenetic features of its dentition captured by different stages in a growth series are unique among early branching mammaliaforms but detailed knowledge remains scarce. Here we report a newly discovered mandible of Sinoconodon rigneyi from the Lower Jurassic Lufeng Formation, Lufeng, Yunnan, China. It has distinct mandibular and dental features of Sinoconodon, e.g., a prominent mandibular condyle leveled to the postcanine alveolar line, a reduced postdentary trough and its medial ridge, and a Meckelian groove parallel to the ventral border of the mandible. This very small mandible also shows two juvenile features of Sinoconodon: two molariform loci medial to the coronoid process and four lower premolariform loci as indicated by alveoli, without a postcanine diastema. The presence of more complete lower premolariform loci is undocumented and new to the known Sinoconodon specimens, augmenting the understanding of tooth development of early ontogenetic stages in Sinoconodon. It reinforces that the development and enlargement of the postcanine diastema is a growth feature indicating maturity of individuals. The aging-indicative pattern of premolariform loss without replacement and with their alveoli plugged is similar to that in other early mammaliaforms, and enhances our understanding of ontogenetic changes of dentition in early branching mammaliaforms.
WOS关键词TRANSFORMATION ; EVOLUTION
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000] ; Youth Innovation Promotion Association, CAS[2021068] ; National Natural Science Foundation of China[42288201] ; National Natural Science Foundation of China[42272017] ; National Natural Science Foundation of China[41802005] ; National Natural Science Foundation of China[41888101]
WOS研究方向Paleontology
语种英语
WOS记录号WOS:001421133200001
出版者TAYLOR & FRANCIS INC
资助机构Strategic Priority Research Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association, CAS ; National Natural Science Foundation of China
源URL[http://119.78.100.205/handle/311034/24353]  
专题中国科学院古脊椎动物与古人类研究所
通讯作者Wang, Haibing
作者单位1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.Yuxi Museum, Yuxi 653100, Yunnan, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Hai, Lun,Wang, Yi,Wang, Haibing,et al. A juvenile specimen of Sinoconodon rigneyi with new information on pattern of tooth replacement[J]. JOURNAL OF VERTEBRATE PALEONTOLOGY,2024:7.
APA Hai, Lun.,Wang, Yi.,Wang, Haibing.,Gao, Yuan.,Zhu, Zifan.,...&Wang, Yuanqing.(2024).A juvenile specimen of Sinoconodon rigneyi with new information on pattern of tooth replacement.JOURNAL OF VERTEBRATE PALEONTOLOGY,7.
MLA Hai, Lun,et al."A juvenile specimen of Sinoconodon rigneyi with new information on pattern of tooth replacement".JOURNAL OF VERTEBRATE PALEONTOLOGY (2024):7.

入库方式： OAI收割

来源：古脊椎动物与古人类研究所

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