安徽巢湖早三叠世短腿巢湖龙的牙齿替换研究

对产自安徽省巢湖市马家山剖面下三叠统奥伦尼克阶斯帕斯亚阶南陵湖组上段的短腿巢湖龙标本(GMPKU-P-3086)进行研究,根据CT扫描数据重建牙齿及前颌骨、上颌骨和齿骨的三维模型.通过对模型进行观察和度量,并与实际标本进行对比,发现以下短腿巢湖龙牙齿新的特征:1)颌骨上存在连续的牙槽沟,且内具浅的牙槽窝,牙齿为亚槽生齿;2)牙齿的大小和形状呈周期性变化,显示奇偶相间的交替模式;3)口腔前部发育单牙列,替换齿位于功能齿的远中位置;4)口腔后部发育双牙列,替换齿列位于功能齿的舌侧-远中位置.短腿巢湖龙的牙齿特征与早三叠世基干鱼龙类短尾鱼龙和歌津鱼龙具有一致性,可能代表鱼龙类牙齿的原始特征,并反映捕...

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Published in北京大学学报（自然科学版） Vol. 60; no. 2; pp. 239 - 248
Main Authors 顾书纶, 江大勇, 周敏
Format Journal Article
LanguageChinese
Published 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871 01.03.2024
Subjects
Chaohusaurus brevifemoralis
tooth replacement
早三叠世
Early Triassic
短腿巢湖龙
牙齿替换
CT scanning
CT扫描
Online AccessGet full text
ISSN0479-8023
DOI10.13209/j.0479-8023.2024.002

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Abstract 对产自安徽省巢湖市马家山剖面下三叠统奥伦尼克阶斯帕斯亚阶南陵湖组上段的短腿巢湖龙标本(GMPKU-P-3086)进行研究,根据CT扫描数据重建牙齿及前颌骨、上颌骨和齿骨的三维模型.通过对模型进行观察和度量,并与实际标本进行对比,发现以下短腿巢湖龙牙齿新的特征:1)颌骨上存在连续的牙槽沟,且内具浅的牙槽窝,牙齿为亚槽生齿;2)牙齿的大小和形状呈周期性变化,显示奇偶相间的交替模式;3)口腔前部发育单牙列,替换齿位于功能齿的远中位置;4)口腔后部发育双牙列,替换齿列位于功能齿的舌侧-远中位置.短腿巢湖龙的牙齿特征与早三叠世基干鱼龙类短尾鱼龙和歌津鱼龙具有一致性,可能代表鱼龙类牙齿的原始特征,并反映捕压式食性群团地理分布的广泛性.
AbstractList 对产自安徽省巢湖市马家山剖面下三叠统奥伦尼克阶斯帕斯亚阶南陵湖组上段的短腿巢湖龙标本(GMPKU-P-3086)进行研究,根据CT扫描数据重建牙齿及前颌骨、上颌骨和齿骨的三维模型.通过对模型进行观察和度量,并与实际标本进行对比,发现以下短腿巢湖龙牙齿新的特征:1)颌骨上存在连续的牙槽沟,且内具浅的牙槽窝,牙齿为亚槽生齿;2)牙齿的大小和形状呈周期性变化,显示奇偶相间的交替模式;3)口腔前部发育单牙列,替换齿位于功能齿的远中位置;4)口腔后部发育双牙列,替换齿列位于功能齿的舌侧-远中位置.短腿巢湖龙的牙齿特征与早三叠世基干鱼龙类短尾鱼龙和歌津鱼龙具有一致性,可能代表鱼龙类牙齿的原始特征,并反映捕压式食性群团地理分布的广泛性.
Abstract_FL A specimen of Chaohusaurus brevifemoralis (GMPKU-P-3086) from the Lower Triassic in Chaohu City, Anhui Province is examined by using high-resolution CT scan data to create a 3D reconstruction. The reconstructed models include models of teeth, premaxilla, maxilla, and dentary. Through observation and measurement of the model, and comparison with the specimen, the following new features of this basal ichthyosauriformes were found. 1) the implantation is subthecodont based on the presence of a dental groove with shallow sockets at the bottom. 2) the sizes and shapes of the teeth vary periodically and appear as an odd-even alternate pattern. 3) the anterior teeth form a single row, with the replacement tooth setting on the distal position of the functional tooth. 4) Two rows of teeth at the distal parts of the dentary and maxilla are firstly found in Chaohusaurus. The lingual row comprises replacement teeth for the labial row, and each replacement tooth lies disto-lingual of its predecessor. These dental features found in Chaohusaurus brevifemoralis are consistent to that of the Early Triassic ichthyosauriformes, such as Grippia and Utatsusaurus, which might represent a primitive condition of the dental character of ichthyosauri-formes and reflect a broad geographical distribution of crunch feeding guild.
Author 顾书纶
周敏
江大勇
AuthorAffiliation 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871
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Author_FL ZHOU Min
JIANG Dayong
GU Shulun
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DocumentTitle_FL Study of the Tooth Replacement of Chaohusaurus brevifemoralis from the Lower Triassic of Chaohu, Anhui Province
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Keywords Chaohusaurus brevifemoralis
tooth replacement
早三叠世
Early Triassic
短腿巢湖龙
牙齿替换
CT scanning
CT扫描
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PublicationTitle 北京大学学报（自然科学版）
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Title 安徽巢湖早三叠世短腿巢湖龙的牙齿替换研究
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