小袁氏兽的再研究及三列齿兽齿尖同源性和上颌-腭部演化的探讨
Reinvestigation of Yuanotherium minor and its implications for the cuspal homology and maxillary-palatal evolution of tritylodontids
摘要
Abstract
Several tritylodontid taxa have been reported from the Upper Jurassic of the Wucaiwan area in the Junggar Basin of Xinjiang,northwestern China,including Yuanotherium minor.The original study described the partially preserved postcanine teeth in the middle of the left upper maxilla.After detailed re-examination of the specimen and by CT scanning,3D reconstruction,and scanning electron microscopy observations,we provided a more detailed description of the osteology,neurosensory,and tooth wear pattern for all the bones preserved in this specimen and clarified some characters.Based on new information about the cusp wear pattern,the chewing movement pattern of the dentition and detailed cusp morphology,we discussed the cuspal homology of upper cheek teeth of tritylodontids and postulate a standardized method for cusp identification.We hypothesize that the unique maxilla characteristics furnish the evidence for transitional stages about the evolution of the upper jaw-palate structure in tritylodontids.关键词
上侏罗统/三列齿兽类/袁氏兽/齿尖同源性/上颌-腭部演化Key words
Upper Jurassic/Tritylodontidae/Yuanotherium/cuspal homology/maxillary-palatal evolution分类
生物学引用本文复制引用
刘璐,任纪澄,毛方园..小袁氏兽的再研究及三列齿兽齿尖同源性和上颌-腭部演化的探讨[J].古脊椎动物学报（中英文）,2025,63(2):81-101,21.基金项目
国家自然科学基金(批准号:42122010,42288201)、云南省振兴人才支撑计划(编号:202305AB350006)、中国科学院青年创新促进会(编号:Y2023017)和北京市财政特别资助资助. The authors thank Drs.Hu Yaoming(IVPP),James M.Clark(George Washington University)and Meng Jin(American Museum of Natural History)for the preliminary works （批准号:42122010,42288201）
Dr.Xu Xing and his team(IVPP)for collecting the specimen （IVPP）
Ding Xiaoqing(IVPP)for preparing the specimen （IVPP）
Hou Yemao,Yin Pengfei,and Wang Jia for their assistance with CT scanning of this fossil （）
Wang Xiaomin(Key Laboratory of Deep Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences)for SEM imaging of the specimens.We sincerely thank Drs.Liu Jun and Meng Jin for their contribution to the peer review of this work,and Drs.Zhou Shuang and Zhu Min for the editorial efforts.This study was supported by the National Natural Science Foundation of China(Nos.42122010,42288201),the Yunnan Revitalization Talent Support Program(No.202305AB350006),the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.Y2023017),and the special financial support of the Beijing Government. （Key Laboratory of Deep Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences）
