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Lithostrotia is a derived group of titanosaurs, excluding primitive forms such as Andesaurus and Phuwiangosaurus. [10] The possibly equivalent clade Titanosauridae was positioned in a phylogenetic analysis by Calvo et al. (2007), where it included all titanosaurs apart from Andesaurus , though multiple primitive forms were not analyzed. [ 11 ]
Bustingorrytitan was entered into a phylogenetic analysis and recovered as a member of the Lithostrotia, which itself is recovered as a subclade of the Saltasauroidea, in contrast to most analyses. The results of the analysis are shown in the cladogram below: [1]
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The cervical and dorsal vertebrae are opisthocoelous; the caudal vertebrae were procoelous (a characteristic common in Lithostrotia). The seventh and eighth tail vertebrae are fused together; this probably represents a pathology. As in other titanosauriforms, the dorsal ribs are compressed and blade-like. The ulna was robust, and the bottom ...
They found Lithostrotia to be divided into two main lineages, one containing Saltasauridae, the other containing Lognkosauria, with Tengrisaurus belonging to the former. The following cladogram follows their analysis.
Arackar was placed in the Titanosauria within the Lithostrotia in 2021, as a sister taxon of Isisaurus. Together, they form a sister clade to Rapetosaurus , within the Lithostrotia. The cladogram from Rubilar-Rogers et al. (2021) is shown below: [ 2 ]
Eutitanosauria was often broadly similar to Lithostrotia, and has often been unused or unlabelled on phylogenies. Sometimes Epachthosaurus would be more primitive than Malawisaurus, making Eutitanosauria more encompassing than Lithostrotia, or Epachthosaurus could nest close to Colossosauria and limit Eutitanosauria to a smaller group of ...
Baurutitan is a genus of sauropod dinosaur that lived during the Late Cretaceous in what is now Brazil.The type species, Baurutitan britoi, was described in 2005 by Kellner and colleagues, although the fossil remains had already been discovered in 1957.