sentences:  include caudal vertebrae with strongly concave front faces (procoely), although the farthest vertebrae are not procoelous.In 1895, Richard Lydekker named the family Titanosauridae to summarize sauropods with procoelous (concave on the front) caudal vertebrae.The name Titanosauridae has since been widely used, and was defined by Salgado and colleagues (1997), Gonzalaz-Riga (2003) and Salgado (2003) as node-based taxon.