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美国北卡罗来纳州上三叠统北方阔齿兽(犬齿兽类:横齿兽科)的齿系和牙齿替换

2010年第48卷 第3期: 169-184

发表日期:2010-09-25来源:放大 缩小

作者:刘俊,Hans-Dieter SUES

摘要:描述了产自美国北卡罗来纳州上三叠统横齿兽类北方阔齿兽新材料的牙齿。基于牙齿的特征,尤其是犬后齿的形态,这些标本被暂归入杰斐逊北方阔齿兽Boreogomphodon jeffersoni; 不过它们的下阔齿型犬后齿前横脊一般有两个而不是3个齿尖。根据牙齿大小、直接替换情况,推测阔齿型齿从后部萌发,从前部脱落。这个类群仅有一代阔齿型犬后齿;至少有一代,可能是两代裂齿型犬后齿。

关键词:美国北卡罗来纳州,上三叠统,横齿兽科, 北方阔齿兽, 齿系

卷期:48卷 03期

 

DENTITION AND TOOTH REPLACEMENT OF BOREOGOMPHODON (CYNODONTIA: TRAVERSODONTIDAE) FROM THE UPPER TRIASSIC OF NORTH CAROLINA, USA

 

LIU Jun,  Hans-Dieter SUES

 

Abstract  The teeth of new specimens of the traversodontid cynodont Boreogomphodon from the Upper Triassic of North Carolina are described. Based on dental features, especially the postcanine morphology, the North Carolina specimens are tentatively referred to Boreogomphodon jeffersoni, although their lower gomphodont postcanines typically have two rather than three cusps on the anterior transverse ridge. Based on the tooth size, direct replacement on all available specimens, the gomphodont teeth were shed anteriorly and added posteriorly. Only one generation of gomphodont teeth, at least one and possibly two generations of sectorial postcanines were present.
Key words  North Carolina, USA; upper Triassic; Traversodontidae, Boreogomphodon; dentition

 

 

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