北京大学学报（自然科学版）2024，Vol.60Issue(2)：239-248,10.DOI:10.13209/j.0479-8023.2024.002
安徽巢湖早三叠世短腿巢湖龙的牙齿替换研究
Study of the Tooth Replacement of Chaohusaurus brevifemoralis from the Lower Triassic of Chaohu, Anhui Province
摘要
Abstract
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.关键词
短腿巢湖龙/早三叠世/牙齿替换/CT扫描Key words
Chaohusaurus brevifemoralis/Early Triassic/tooth replacement/CT scanning引用本文复制引用
顾书纶,江大勇,周敏..安徽巢湖早三叠世短腿巢湖龙的牙齿替换研究[J].北京大学学报（自然科学版）,2024,60(2):239-248,10.基金项目
国家自然科学基金(40920124002,41920104001)、高等学校博士学科点专项科研基金(20120001110072)、安徽省自然资源厅科技项目(2021-k-13)和安徽省公益性地质工作项目(2021-g-2-16)资助 （40920124002,41920104001）
