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".
Sauropoda
Their body structure did not vary as much as other dinosaurs, perhaps due to size constraints, but they displayed ample variety. Some, like the diplodocids, possessed tremendously long tails, which they may have been able to crack like a whip as a signal or to deter or injure predators, or to make sonic booms. "Supersaurus", at long, was the longest sauropod known from reasonably complete remains, but others, like the old record holder, "Diplodocus", were also extremely long. The holotype (and now lost) vertebra of "Amphicoelias fragillimus" may have come from an animal long; its vertebral column would have been substantially longer than that of the blue whale. However, a research published in 2015 speculated that the size estimates of "A. fragillimus" may have been highly exaggerated. The longest dinosaur known from reasonable fossils material is probably "Argentinosaurus huinculensis" with length estimates of to .