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".
Diplodocus
"Diplodocus hallorum", known from partial remains, was even larger, and is estimated to have been the size of four elephants. When first described in 1991, discoverer David Gillette calculated it may have been up to 52 m (171 ft) long, making it the longest known dinosaur (excluding those known from exceedingly poor remains, such as "Amphicoelias"). Some weight estimates of this time ranged as high as . The estimated length was later revised downward to and later on to based on findings that show that Gillette had originally misplaced vertebrae 12–19 as vertebrae 20–27. The nearly complete "Diplodocus carnegii" skeleton at the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania, on which size estimates of "D. hallorum" are mainly based, also was found to have had its 13th tail vertebra come from another dinosaur, throwing off size estimates for "D. hallorum" even further. While dinosaurs such as "Supersaurus" were probably longer, fossil remains of these animals are only fragmentary.