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Given that you recently suggested that the traditionally referred Supersaurus specimen BYU 9024 might belong to Barosaurus based on comparisons with the cervical BYU 20815, you might want to compare the neck of the Supersaurus specimen "Jimbo" with Barosaurus because McIntosh (2005) said at he at one point considered Supersaurus a possible giant species of Barosaurus.
The section of diplodocoid diversity in the Morrison should reflect that Carpenter (2018) has placed "Amphicoelias" fragillimus in its own genus, Maraapunisaurus, and reassigned the species to Rebbachisauridae based on comparisons with dorsal vertebrae of rebbachisaurids. I have wholeheartedly agreed with Carpenter's revised size estimate for Maraapunisaurus because Diplodocus hallorum was initially thought to have been 130-150 feet long before later work revised its size to 110 feet. It's not implausible to think that rebbachisaurids existed in the Morrison because of the discovery of the oldest dicraeosaurid Lingwulong (Xu et al. 2018) from the Middle Jurassic of north-central China.
Carpenter, K., 2018, Maraapunisaurus fragillimus, n.g. (formerly Amphicoelias fragillimus), a basal rebbachisaurid from the Morrison Formation (Upper Jurassic) of Colorado: Geology of the Intermountain West, v. 5, p. 227–244.
Xing Xu; Paul Upchurch; Philip D. Mannion; Paul M. Barrett; Omar R. Regalado-Fernandez; Jinyou Mo; Jinfu Ma; Hongan Liu (2018). A new Middle Jurassic diplodocoid suggests an earlier dispersal and diversification of sauropod dinosaurs. Nature Communications. 9: Article number 2700. doi:10.1038/s41467-018-05128-1.