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Phuwiangosaurus (meaning "Phu Wiang lizard") is a genus of titanosauriform dinosaur from the Early Cretaceous (Valanginian-Hauterivian) Sao Khua Formation of Thailand. The type species, P. sirindhornae, was described by Martin, Buffetaut, and Suteethorn in 1994; it was named to honour Princess Maha Chakri Sirindhorn of Thailand, who was interested in the geology and palaeontology of Thailand.

Temporal range: Early Cretaceous, 140–130 Ma
Phuwiangosaurus sirindhornae femur.JPG
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Clade: Sauropoda
Family: Euhelopodidae
Genus: Phuwiangosaurus
Martin, Buffetaut and Suteethorn, 1994
Type species
Phuwiangosaurus sirindhornae
Martin, Buffetaut and Suteethorn, 1994
Phuwiangosaurus and Siamosaurus in their habitat

It was a mid-sized sauropod, measuring 15–20 m in length.

Phuwiangosaurus was originally assigned to Titanosauria, but more recent studies have placed it in a more basal position within the Titanosauriformes. Phylogenetic analyses presented by D'Emic (2012), Mannion et al. (2013), and Mocho et al. (2014) resolve Phuwiangosaurus within the Euhelopodidae, alongside genera such as Euhelopus and Tangvayosaurus.[1][2][3] Other analyses have failed to find support for such a grouping,[4] including some finding it to be paraphyletic at the base of Somphospondyli.[2][5]


  1. ^ M. D. D'Emic. 2012. The early evolution of titanosauriform sauropod dinosaurs. Zoological Journal of the Linnean Society 166:624-671.
  2. ^ a b P. D. Mannion, P. Upchurch, R. N. Barnes and O. Mateus. 2013. Osteology of the Late Jurassic Portuguese sauropod dinosaur Lusotitan atalaiensis (Macronaria) and the evolutionary history of basal titanosauriforms. Zoological Journal of the Linnean Society 168:98-206.
  3. ^ P. Mocho, R. Royo-Torres, and F. Ortega. 2014. Phylogenetic reassessment of Lourinhasaurus alenquerensis, a basal Macronaria (Sauropoda) from the Upper Jurassic of Portugal. Zoological Journal of the Linnean Society 170:875-916.
  4. ^ M. D. D'Emic. 2013. Revision of the sauropod dinosaurs of the Lower Cretaceous Trinity Group, southern USA, with the description of a new genus. Journal of Systematic Palaeontology 11(6):707-726.
  5. ^ Zaher, H.; Pol, D.; Carvalho, A.B.; Nascimento, P.M.; Riccomini, C.; Larson, P.; Juarez-Valieri, R.; Pires-Domingues, R.; da Silva Jr, N.J.; de Almeida Campos, D. (2011). "A complete skull of Early Cretaceous sauropod and the evolution of advanced titanosaurians". PLOS One. 6 (2): e16663. doi:10.1371/journal.pone.0016663.