Futalognkosaurus [SEP] parent taxon
most complete giant dinosaur known so far".
Classification.
In their phylogenetic analysis, Calvo and colleagues found "Futalognkosaurus" to be a member of the Titanosauridae (or Lithostrotia, depending on the definitions being used), and most closely related to "Mendozasaurus". They defined a new clade for the group containing both "Futalognkosaurus" and "Mendozasaurus", their common ancestor, and all descendants, which they named the Lognkosauria. The authors found "Malawisaurus" to be the sister group of this new clade
spines. A preliminary phylogenetic analysis supported this assignment, placing "Quetecsaurus" as a sister taxon of the clade formed by "Mendozasaurus" and "Futalognkosaurus".