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 "Argentinosaurus", which may have weighed to  kilograms (90 to 110 short tons) and reached lengths of ; some of the longest were the long "Diplodocus hallorum" (formerly "Seismosaurus"), the long "Supersaurus", and long "Patagotitan"; and the tallest, the tall "Sauroposeidon", which could have reached a sixth-floor window. The heaviest and longest dinosaur may have been "Maraapunisaurus", known only from a now lost partial vertebral neural arch described in 1878. Extrapolating from the illustration of this bone, the animal may have been long and weighed kg ( lb). However, as no further evidence of sauropods of this size has been found, and the discoverer, Cope, had made typographic errors before, it is likely to have been an extreme overestimation.