古脊椎动物学报（中英文）2024，Vol.62Issue(3)：225-244,20.DOI:10.19615/j.cnki.2096-9899.240715
高分辨率CT扫描数据揭示晚侏罗世暴龙类五彩冠龙牙齿替换模式
High-resolution CT-scan data reveals the tooth replacement pattern of the Late Jurassic tyrannosauroid Guanlong wucaii(Dinosauria,Theropoda)
摘要
Abstract
The Tyrannosauridae,which is characterized by specialized pachydont dentition and putative bone-cracking predatory strategies,is one of the most extensively studied theropod lineages.Although tooth replacement patterns,crucial for understanding feeding behaviors,have been thoroughly studied in this group,studies on non-tyrannosaurid tyrannosauroids are relatively scarce.This study utilizes high-resolution CT data to investigate the tooth replacement pattern in two specimens of Guanlong wucaii,a Late Jurassic tyrannosauroid,and provides insights into the evolution of tooth replacement across Tyrannosauroidea.Second-generation replacement teeth,a rarity observed mainly in giant predatory theropods(e.g.some tyrannosaurids),were detected in the dentary dentition of the juvenile Guanlong.Zahnreihen reconstructions display a consistent cephalad alternating tooth replacement pattern in the maxilla and the dentary of both of the examined individuals,with Z-spacing values exceeding 2.0.As Guanlong grows,the Z-spacing value in the maxillary dentition increases,resembling the ontogenetic changes documented in the Tyrannosauridae.Additionally,like Tarbosaurus,Guanlong also displays a discontinuity between the tooth replacement waves at the premaxilla-maxilla boundary.This study thus demonstrates that some tyrannosaurid-like tooth replacement patterns were acquired before the origin of the Tyrannosauridae.关键词
晚侏罗世/暴龙超科/牙齿替换/三维重建Key words
Late Jurassic/Tyrannosauroidea/tooth replacement/3D reconstruction分类
生物科学引用本文复制引用
柯易晖,裴睿,徐星..高分辨率CT扫描数据揭示晚侏罗世暴龙类五彩冠龙牙齿替换模式[J].古脊椎动物学报（中英文）,2024,62(3):225-244,20.基金项目
国家自然科学基金(批准号:42288201,42372031,41972025)和中国科学院国际伙伴计划项目(编号:132311KYSB20190010)资助. This study was supported by the National Natural Science Foundation of China(42288201,42372031,41972025)and the International Partnership Program of Chinese Academy of Sciences(Grant No.132311KYSB20190010).The funders had no role in study design,data collection and analysis,the decision to publish,or the preparation of the manuscript.We declare that AI-assisted technologies were utilized in creating this article. （批准号:42288201,42372031,41972025）
