Early-diverging Titanosauriform (Dinosauria, Sauropoda) Teeth from the Lower Cretaceous Yixian Formation of Southeastern Inner Mongolia, Northeast China |
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| Authors: | ZHANG Honggang YIN Yalei PEI Rui ZHOU Changfu |
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| Institution: | 1 College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266570, China
2 College of Paleontology, Shenyang Normal University, Shenyang 110034, China;2 College of Paleontology, Shenyang Normal University, Shenyang 110034, China
3 Key Laboratory of Evolution of Past Life in NE Asia, Ministry of Natural Resources, Shenyang 110034, China;4 Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
5 CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, China |
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| Abstract: | 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. |
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| Keywords: | teeth Titanosauriformes Lower Cretaceous Yixian Formation Ningcheng |
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