| Trigonosaurus Temporal range: Maastrichtian,
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| Vertebrae of the holotype (MCT 1488-R) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Clade: | †Macronaria |
| Clade: | †Titanosauria |
| Family: | †Saltasauridae |
| Subfamily: | †Saltasaurinae |
| Genus: | †Trigonosaurus Campos et al. 2005[1] |
| Species: | †T. pricei
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| Binomial name | |
| †Trigonosaurus pricei Campos et al. 2005[1]
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Trigonosaurus (meaning "triangle lizard" after Triangulo Mineiro, where it was found[1]), is a genus of saltasaurid dinosaurs from the Maastrichtian Serra da Galga Formation of Brazil. The type species, Trigonosaurus pricei, was first described by Campos, Kellner, Bertini, and Santucci in 2005. It was based on two specimens, both consisting mainly of vertebrae. The two specimens were originally believed to have come from the same individual. However, one specimen was described as the holotype of Caieiria in 2022, while the holotype may have instead come from Baurutitan.[2] Before its description, it was known as the "Peirópolis titanosaur", after the place it was found.[1]
- ^ a b c d Campos, D.A.; Kellner, A.W.A.; Bertini, R.J.; Santucci, R.M. (2005). "On a titanosaurid (Dinosauria, Sauropoda) vertebral column from the Bauru Group, Late Cretaceous of Brazil". Arquivos do Museu Nacional. 63 (3): 565–593.
- ^ Cite error: The named reference
Caieiriawas invoked but never defined (see the help page).