[1] From the 1940s to 1960s, the paleontologist Llewellyn Ivor Price excavated several series of titanosaur fossils in the "Caieira" locality of the Serra da Galga Formation in Minas Gerais, Brazil and he discovered the holotype of Caieiria around 1957.

[2] Further titanosaurs from the BR-262 site of the same locality were reported by Silva Junior and colleagues in 2022, and in light of this new evidence, reconsidered MCT 1488-R to be a specimen of Baurutitan and thus synonymized Trigonosaurus with it.

Silva Junior et al. performed a phylogenetic analysis of titanosaurs including both Caieiria and Baurutitan with the latter incorporating information from Trigonosaurus.

Their cladogram is shown below:[1] Rinconsaurus Uberabatitan Baurutitan Gondwanatitan Bravasaurus Caieiria Muyelensaurus Overosaurus Arrudatitan Aeolosaurus spp.

[3] Other than Baurutitan and Caieiria, other animals from this formation include the unenlagiine Ypupiara and the crocodylomorphs Itasuchus, Peirosaurus, and Uberabasuchus.