Maxakalisaurus is a genus of aeolosaurid dinosaur, found in the Adamantina Formation of Brazil, 45 kilometers (28 miles) from the city of Prata, in the state of Minas Gerais in 1998. It was related to Saltasaurus, a sauropod considered unusual because it had evolved apparently defensive traits, including bony plates on its skin and vertical plates along its spine; such osteoderms have also been found for Maxakalisaurus. The genus name is derived from the tribe of the Maxakali; Topa is one of their divinities.
Temporal range: Late Cretaceous
Kellner et al., 2006
Kellner et al., 2006
The type specimen of Maxakalisaurus belonged to an animal about 13 meters (43 feet) long, with an estimated weight of 9 tons, although, according to paleontologist Alexander Kellner, it could have reached a length of approximately 20 meters (66 feet). It had a long neck and tail, ridged teeth (unusual among sauropods) and lived about 80 million years ago. Because sauropods seem to have lacked significant competition in South America, they evolved there with greater diversity and more unusual traits than elsewhere in the world.
"This is the biggest dinosaur yet described in Brazil," said Alexander Kellner, lead author of the scientific description. "We have found the bones of what appear to be larger dinosaurs, but we still haven't been able to put them together for scientific descriptions."
In 2016, a new specimen comprising a dentary and teeth was described as belonging to Maxakalisaurus. The phylogenetic analysis recovered Maxakalisaurus as an aeolosaurine along with Aeolosaurus and Gondwanatitan.
- Kellner, A.W.A., Campos, D.A., Azevedo, S.A.K., Trotta, M.N.F., Henriques, D.D.R., Craik, M.M.T., and Silva, H.P. (2006). "On a new titanosaur sauropod from the Bauru Group, Late Cretaceous of Brazil. Archived 2015-09-24 at the Wayback Machine" Boletim do Museu Nacional (Geologia), 74: 1-31.
- Astor, Michael (2006-08-29). "Brazil's Biggest Dinosaur Unveiled". LiveScience. Retrieved 2007-09-22.
- França et al. (2016), New lower jaw and teeth referred to Maxakalisaurus topai (Titanosauria: Aeolosaurini) and their implications for the phylogeny of titanosaurid sauropods. PeerJ 4:e2054; doi:10.7717/peerj.2054
- BBC. "Brazil National Museum fire: Key treasures at risk". BBC. Retrieved 4 September 2018.
- Santucci, R. M. & Bertini, R.J. (2006). "A large sauropod titanosaur from Peirópolis, Bauru Group, Brazil." N. Jb. Geol. Paläont. Mh., 2006: 344-360; Stuttgart.
- Brazil's Biggest Dinosaur Unveiled - LiveScience.com