sentences:  The name Lithostrotia is not currently recognized by all researchers.Upchurch and colleagues (2004) define the Lithostrotia as a node-based taxon that includes the last common ancestor of "Malawisaurus" and "Saltasaurus" and all descendants of that ancestor.According to this definition the Lithostrotia includes all forms that are more derived than "Malawisaurus" in phylogenies.