T. rex’s Distant Relative Lived in Thailand 145 Million Years Ago

Three fossilized enamel from a beforehand unknown species of non-tyrannosaurid tyrannosauroid dinosaur had been unearthed in northeastern Thailand by a crew of paleontologists from Kasetsart College, Mahasarakham College and Sirindhorn Museum.

Paleoenvironmental  reconstruction  of  the  Leisurely  Jurassic  Phu  Kradung  Formation  of  northeastern  Thailand. List credit score: Chatcharin Somboon.

Paleoenvironmental reconstruction of the Leisurely Jurassic Phu Kradung Formation of northeastern Thailand. List credit score: Chatcharin Somboon.

Tyrannosauroidea is a clade of theropods, including effectively-identified carnivorous dinosaurs equivalent to Tyrannosaurus rex from the Leisurely Cretaceous of North America,” mentioned Dr. Chatchalerm Ketwetsuriya of Kasetsart College and colleagues.

“They primarily inhabited in the supercontinent Laurasia in the route of the Middle Jurassic to Leisurely Cretaceous.”

“The earliest-identified contributors of Tyrannosauroidea had been deliver in the Middle Jurassic of Europe and Asia, suggesting the muse of this theropod neighborhood inside of Eurasia.”

“Tyrannosauroids had been dispensed from the Leisurely Jurassic to the Leisurely Cretaceous of Asia, with most Asian tyrannosaurs deliver in China and Mongolia.”

The three isolated enamel of a tyrannosauroid dinosaur examined by the crew had been recovered from the Phu Noi locality, Kham Muang district, Kalasin province, northeastern Thailand.

The specimens date relief to the Tithonian age of the Jurassic length, about 145 million years previously.

Isolated enamel of basal tyrannosauroid dinosaur from the Phu Noi locality, Thailand. List credit score: Chowchuvech et al.

Isolated enamel of basal tyrannosauroid dinosaur from the Phu Noi locality, Thailand. List credit score: Chowchuvech et al.

“The Phu Noi locality is effectively-known as one in every of primarily the most prolific Mesozoic vertebrate deposits in Southeast Asia,” the paleontologists mentioned.

“A form of species had been unearthed from this wretchedness, including freshwater sharks, ray-finned fishes, lungfishes, amphibians, turtles, crocodyliforms, pterosaurs, and dinosaurs.”

“Within the Phu Noi locality, three dinosaur species had been identified, comprising a metriacanthosaurid theropod, a mamenchisaurid sauropod, and the basal neornithischians Minimocursor phunoiensis.”

“Three of those theropod enamel from the Phu Noi locality display hide uncommon dental aspects that can even be renowned from outdated learned metriacanthosaurid theropod, including the lateral enamel with mesiolingual curved mesial carinae extending above the cervix line and braided enamel surface texture,” they added.

“Morphological examination alongside with cladistics and morphometric analyses display hide that these isolated enamel point to the synapomorphies of basal tyrannosauroids, carefully related to Guanlong wucaii and Proceratosaurus bradleyi from the Jurassic length.”

“This discovery notes the principle report of Tyrannosauroidea in the Jurassic of Southeast Asia and contributes to the facts paleoecology of the lower Phu Kradung Formation, as effectively as paleobiogeo-graphical distribution of tyrannosauroids in the route of the Leisurely Jurassic,” they concluded.

“Moreover, this look sheds mild on the probability to discovering new Thai dinosaur species in future excavations and stories.”

The look used to be published in the journal Tropical Pure Historical past.

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W. Chowchuvech et al. 2024. The First Incidence of a Basal Tyrannosauroid in Southeast Asia: Dental Evidence from the Higher Jurassic of Northeastern Thailand. Tropical Pure Historical past 24 (1): 84-95