Friday, June 14, 2024

[Paleontology • 2024] The First Occurrence of a Basal Tyrannosauroid in Southeast Asia: Dental Evidence from the Upper Jurassic of Northeastern Thailand


Tyrannosauroidea indet.

in Chowchuvech, Manitkoon, Chanthasit et Ketwetsuriya, 2024.
Illustration: Chatcharin Somboon.

Abstract
Isolated theropod teeth are one of the most common vertebrate fossils that have been found in the Khorat Group of Thailand. Furthermore, several isolated teeth have been discovered from the Upper Jurassic Phu Kradung Formation, located in Phu Noi locality of Kalasin Province, Northeastern Thailand. Three of those theropod teeth from the Phu Noi locality show unique dental features that can be distinguished from previous discovered metriacanthosaurid theropod, including the lateral teeth with mesiolingual twisted mesial carinae extending above the cervix line and braided enamel surface texture. Morphological examination with cladistics and morphometric analyses show that these isolated teeth exhibit the synapomorphies of basal tyrannosauroids, closely related to Guanlong wucaii and Proceratosaurus bradleyi from the Jurassic Period. This paper notes the first report of a basal tyrannosauroid in Southeast Asia as well as significantly contributes to our understanding of paleoecology of the Upper Jurassic Phu Kradung Formation and paleobiogeography of Tyrannosauroidea during the Jurassic Period.

Keywords: Dinosauria, Theropod, isolated teeth, Phu Kradung Formation, Mesozoic Era


Paleoenvironmental reconstruction of the Late Jurassic Phu Kradung Formation of Northeastern Thailand.
Illustrated by Chatcharin Somboon.



Wongwech Chowchuvech, Sita Manitkoon, Phornphen Chanthasit and Chatchalerm Ketwetsuriya. 2024. The First Occurrence of a Basal Tyrannosauroid in Southeast Asia: Dental Evidence from the Upper Jurassic of Northeastern Thailand. Tropical Natural History. 24(1); 84–95.   li01.tci-thaijo.org/index.php/tnh/article/view/261261
Researchgate.net/publication/376029479_The_First_Occurrence_of_Tyrannosauroid_Dinosaur_in_Southeast_Asia


ค้นพบ ฟันไดโนเสาร์ไทแรนโนซอรอยด์ ญาติเก่าแก่ของ T. rex ยุคจูแรสซิกในประเทศไทย 🦖

...  ซากดึกดำบรรพ์ฟันไดโนเสาร์ไทแรนโนซอรอยด์แรกเริ่ม จากหมวดหินภูกระดึงตอนล่าง ยุคจูแรสซิกตอนปลาย ในแหล่งซากดึกดำบรรพ์ภูน้อย อำเภอคำม่วง จังหวัดกาฬสินธ์ุ ซึ่งเป็นหนึ่งในญาติเก่าแก่ของไดโนเสาร์กินเนื้อขนาดใหญ่ชื่อดังอย่างไทแรนโนซอรัส เร็กซ์ หรือ ที. เร็กซ์ ในยุคครีเทเชียสตอนปลาย ทวีปอเมริกาเหนือ ...