A juvenile specimen of <i>Sinoconodon rigneyi</i> with new information on pattern of tooth replacement

doi:10.1080/02724634.2024.2442473

IVPP-IR

	*A juvenile specimen of Sinoconodon rigneyi* with new information on pattern of tooth replacement**
	Hai, Lun 1,2; Wang, Yi 3; Wang, Haibing 1; Gao, Yuan 2; Zhu, Zifan 1,4; You, Hailu1,4 ; Wang, Yuanqing1,4
	2024-07-03
发表期刊	JOURNAL OF VERTEBRATE PALEONTOLOGY
ISSN	0272-4634
页码	7
通讯作者	Wang, Haibing(wanghaibing@ivpp.ac.cn)
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.
DOI	10.1080/02724634.2024.2442473
关键词[WOS]	TRANSFORMATION ; EVOLUTION
收录类别	SCI
语种	英语
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]
项目资助者	Strategic Priority Research Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association, CAS ; National Natural Science Foundation of China
WOS研究方向	Paleontology
WOS类目	Paleontology
WOS记录号	WOS:001421133200001
出版者	TAYLOR & FRANCIS INC
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/24354
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.