sentences:  It may be this trait has developed multiple times independently within the titanosaurs and Lithostrotia, as osteoderms are known in many saltasaurids, "Mendozasaurus", "Aeolosaurus", "Ampelosaurus" and various other genera both within and outside Lithostrotia with different morphologies.Lithostrotia is a derived group of titanosaurs, excluding primitive forms such as "Andesaurus" and "Phuwiangosaurus".The possibly equivalent clade Titanosauridae was positioned in a phylogenetic analysis by Calvo "et al."