Several length estimates have been proposed for different taxa, with varying degrees of accuracy. This diagram uses more rigorous estimates to avoid inaccuracy.

Sizes based on:

Supersaurus     : Lovelace, David M.; Hartman, Scott A.; Wahl, William R. (2007). "Morphology of a specimen of Supersaurus (Dinosauria, Sauropoda) from the Morrison Formation of Wyoming, and a re-evaluation of diplodocid phylogeny" Arquivos do Museu Nacional. 65 (4): 527–544. Curtice, Brian (2021). "New Dry Mesa Dinosaur Quarry Supersaurus vivianae (Jensen 1985) axial elements provide additional insight into its phylogenetic relationships and size, suggesting an animal that exceeded 39 meters in length" (PDF).

Argentinosaurus     : Paul, Gregory S. (Autumn 1994)"Big Sauropods - Really, Really Big Sauropods" (PDF). The Dinosaur Report: 12–13. Retrieved November 14, 2011. Argentinosaurus huinculensis schematic. Retrieved April 29, 2019.

Diplodocus     : Carpenter, K. (2006). "Biggest of the big: a critical re-evaluation of the mega-sauropod Amphicoelias fragillimus." In Foster, J.R. and Lucas, S.G., eds., 2006, Paleontology and Geology of the Upper Jurassic Morrison Formation. New Mexico Museum of Natural History and Science Bulletin 36: 131–138. "The biggest of the big". Skeletaldrawing.com. June 14, 2013. Retrieved April 29, 2019

Mamenchisaurus     : Moore, Andrew J.; Barrett, Paul M.; Upchurch, Paul; Liao, Chun-Chi; Ye, Yong; Hao, Baoqiao; Xu (2023). "Re-assessment of the Late Jurassic eusauropod Mamenchisaurus sinocanadorum Russell and Zheng, 1993, and the evolution of exceptionally long necks in mamenchisaurids". Journal of Systematic Palaeontology. 21 (1). doi:10.1080/14772019.2023.2171818.

Sauroposeidon     : Wedel, Mathew J.; Cifelli, Richard L. (Summer 2005). "Sauroposeidon: Oklahoma's Native Giant" (PDF).

Credits to:

Scott A. Hartman - (http://www.skeletaldrawing.com/)

randomdinos - (https://www.deviantart.com/randomdinos)

Steveoc 86 User:Steveoc_86