Early-diverging Titanosauriform(Dinosauria,Sauropoda)Teeth from the Lower Cretaceous Yixian Formation of Southeastern Inner Mongolia,Northeast ChinaOACSTPCD
Early-diverging Titanosauriform(Dinosauria,Sauropoda)Teeth from the Lower Cretaceous Yixian Formation of Southeastern Inner Mongolia,Northeast China
Three eusauropod teeth(SDUST-V1064,PMOL-AD00176,PMOL-ADt0005)are reported from the Lower Cretaceous Yixian Formation of Ningcheng,southeastern Inner Mongolia,China.Two of them(SDUST-V1064,PMOL-AD00176)are assigned to early-diverging titanosauriforms in having slightly mesiodistal expansion at the base of the tooth crown,a slenderness index value>2.0 and<4.0,and D-shaped cross section.Furthermore,SDUST-V1064 and PMOL-AD00176 are referred as an Euhelopus-like titanosauriform on the basis of having a sub-circular boss on the lingual surface and an asymmetrical crown-root margin which slants apically,respectively.CT scan data of SDUST-V1064 reveals new dental information of early-diverging titanosauriforms,for example,the enamel on the labial side thicker than that on the lingual side,an enamel/dentine ratio of 0.26 and a boss present on the lingual side of the dentine of the crown.
ZHANG Honggang;YIN Yalei;PEI Rui;ZHOU Changfu
College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266570,China||College of Paleontology,Shenyang Normal University,Shenyang 110034,ChinaCollege of Paleontology,Shenyang Normal University,Shenyang 110034,China||Key Laboratory of Evolution of Past Life in NE Asia,Ministry of Natural Resources,Shenyang 110034,ChinaKey Laboratory of Evolutionary Systematics of Vertebrates,Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China||CAS Center for Excellence in Life and Paleoenvironment,Beijing 100044,ChinaCollege of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266570,China
teethTitanosauriformesLower CretaceousYixian FormationNingcheng
《地质学报（英文版）》 2024 (002)
303-310 / 8
We thank Yang Qiang,Shao Shuai,Feng Yuhui,Li Yang,Yang Shurui,Yu Peng,and Yang Yuguo(staff of the Paleontological Museum of Liaoning,Shenyang,China)and Yu Dongxiang(student of Shandong University of Science and Technology,Qingdao,China)for their help in field work and fossil preparation.We thank Peng Yu(Zhejiang University,Hangzhou,China)for his help with CT scanning of the tooth.We thank Dr.Ren Xinxin(Institute of Geology,Chinese Academy of Geological Sciences,Beijing,China)for his help in finding literature.We also thank four anonymous reviewers,and editor Xu Xing for their constructive criticisms that greatly improved the quality of this paper.This work was supported by the Scientific Research Foundation of Shenyang Normal University(Grant No.BS202207),Program for Innovative Research Team of Excellent Talents in University of Shandong Province(Grant No.2019KJH004),Taishan Scholar Program of Shandong Province(Grant No.tsqn201812070),Educational Department of Liaoning Province(Grant No.JYTQN2023422),Shandong Provincial Natural Science Foundation(Grant No.ZR2017MD031)and the National Natural Science Foundation of China(Grant Nos.41972025,41688103,42161134003).
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