Unique method of tooth replacement in durophagous placodont marine reptiles, with new data on the dentition of Chinese taxa

IVPP-IR > 中科院古脊椎所（2000年以后）

	Unique method of tooth replacement in durophagous placodont marine reptiles, with new data on the dentition of Chinese taxa
	Neenan, James M.1; Li, Chun2 ; Rieppel, Olivier 3; Bernardini, Federico 4; Tuniz, Claudio 4; Muscio, Giuseppe 5; Scheyer, Torsten M.1
	2014-05-01
发表期刊	JOURNAL OF ANATOMY
卷号	224 期号:5 页码:603-613
文章类型	Article
摘要	The placodonts of the Triassic period (~252-201mya) represent one of the earliest and most extreme specialisations to a durophagous diet of any known reptile group. Exceptionally enlarged crushing tooth plates on the maxilla, dentary and palatine cooperated to form functional crushing areas in the buccal cavity. However, the extreme size of these teeth, combined with the unusual way they occluded, constrained how replacement occurred. Using an extensive micro-computed tomographic dataset of 11 specimens that span all geographic regions and placodont morphotypes, tooth replacement patterns were investigated. In addition, the previously undescribed dental morphologies and formulae of Chinese taxa are described for the first time and incorporated into the analysis. Placodonts have a unique tooth replacement pattern and results follow a phylogenetic trend. The plesiomorphic Placodus species show many replacement teeth at various stages of growth, with little or no discernible pattern. On the other hand, the more derived cyamodontoids tend to have fewer replacement teeth growing at any one time, replacing teeth unilaterally and/or in functional units, thus maintaining at least one functional crushing area at all times. The highly derived placochelyids have fewer teeth and, as a result, only have one or two replacement teeth in the upper jaw. This supports previous suggestions that these taxa had an alternative diet to other placodonts. Importantly, all specimens show at least one replacement tooth growing at the most posterior palatine tooth plates, indicating increased wear at this point and thus the most efficient functional crushing area.
关键词	Triassic Marine Reptiles Placodontia Tooth Replacement Durophagy
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	ORNITHISCHIAN DINOSAURS ; CYAMODUS ; ARTICLE ; LIZARDS ; BIOLOGY
收录类别	SCI
语种	英语
WOS研究方向	Anatomy & Morphology
WOS类目	Anatomy & Morphology
WOS记录号	WOS:000333578700009
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/7359
专题	中科院古脊椎所（2000年以后）
作者单位	1.Univ Zurich, Palaeontol Inst & Museum, CH-8006 Zurich, Switzerland 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 3.Field Museum, Chicago, IL USA 4.Abdus Salam Int Ctr Theoret Phys, Trieste, Italy 5.Museo Friulano Storia Nat, Udine, Italy
推荐引用方式 GB/T 7714	Neenan, James M.,Li, Chun,Rieppel, Olivier,et al. Unique method of tooth replacement in durophagous placodont marine reptiles, with new data on the dentition of Chinese taxa[J]. JOURNAL OF ANATOMY,2014,224(5):603-613.
APA	Neenan, James M..,Li, Chun.,Rieppel, Olivier.,Bernardini, Federico.,Tuniz, Claudio.,...&Scheyer, Torsten M..(2014).Unique method of tooth replacement in durophagous placodont marine reptiles, with new data on the dentition of Chinese taxa.JOURNAL OF ANATOMY,224(5),603-613.
MLA	Neenan, James M.,et al."Unique method of tooth replacement in durophagous placodont marine reptiles, with new data on the dentition of Chinese taxa".JOURNAL OF ANATOMY 224.5(2014):603-613.

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