Maxakalisaurus

Maxakalisaurus is a genus of titanosaur dinosaur, found in the Adamantina Formation of Brazil, in the state of Minas Gerais in 1998. The genus name is derived from the tribe of the Maxakali; Topa is one of their divinities.[1]

Maxakalisaurus
Temporal range: Late Cretaceous
Reconstructed skeleton
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: †Sauropodomorpha
Clade: †Sauropoda
Clade: †Macronaria
Clade: †Titanosauria
Clade: †Lithostrotia
Genus: †Maxakalisaurus
Kellner et al., 2006
Species:
†M. topai
Binomial name
†Maxakalisaurus topai
Kellner et al., 2006
Jaw in multiple views

Description

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.[1] Like the fellow titanosaur Saltasaurus, Maxakalisaurus had defensive osteoderms; one has been found on the holotype.

In 2016, a new specimen comprising a dentary and teeth was described as belonging to Maxakalisaurus. [2]

A reconstructed Maxakalisaurus skeleton was on display in the National Museum of Brazil. It is currently unknown if it was damaged by the National Museum of Brazil fire on 2 September 2018.[3]

Classification

França et al.'s 2016 description of the second specimen also included a phylogenetic analysis, which placed Maxakalisaurus as a basal member of the Aeolosaurini. Their cladogram is shown below:[2]

Lithostrotia
 

Malawisaurus

 
 
 

Muyelensaurus

 
 
Nemegtosauridae
 

Nemegtosaurus

 
 
 

Tapuiasaurus

 
 

Rapetosaurus

 
 
 
Saltasauroidea
 

Diamantinasaurus

 
 

Baurutitan

 
 

Isisaurus

 
Saltasauridae
 
 

Alamosaurus

 
 

Opisthocoelicaudia

 
 
 
 

Neuquensaurus

 
 

Saltasaurus

 
 
 
Aeolosaurini
 

Maxakalisaurus

 
 

Panamericansaurus

 
 

Rinconsaurus

 
 
 

Gondwanatitan

 
 
 

Aeolosaurus maximus

 
 
 

Aeolosaurus colhuehuapensis

 
 

Aeolosaurus rionegrinus

 
 
 
 
 
 
 
 
 

References
  1. 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.
  2. França, M.A.G.; Marsola, J.C.d A.; Riff, D.; Hsiou, A.S.; Langer, M.C. (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. PMC 4906671. PMID 27330853.
  3. 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.
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