Dinosaur size
There were larger dinosaurs, but knowledge of them is based entirely on a small number of fragmentary fossils. Most of the largest herbivorous specimens on record were discovered in the 1970s or later, and include the massive titanosaur "Argentinosaurus huinculensis", which is the largest dinosaur known from uncontroversial evidence, estimated to have been and long. Some of the longest sauropods were those with exceptionally long, whip-like tails, such as the "Diplodocus hallorum" (formerly "Seismosaurus") and the 33- to 35-metre-long (108–115 ft) "Supersaurus". The tallest was the "Brachiosaurus".
Evolution of dinosaurs
The earliest confirmed dinosaur fossils include saurischian ('lizard-hipped') dinosaurs "Nyasasaurus" 243 Ma, "Saturnalia" 225-232 Ma, "Herrerasaurus" 220-230 Ma, "Staurikosaurus" possibly 225-230 Ma, "Eoraptor" 220-230 Ma and "Alwalkeria" 220-230 Ma. "Saturnalia" may be a basal saurischian or a prosauropod. The others are basal saurischians.