Jack Bailey, in 1997, argued that the spines resembled those of sail-bearing pelycosaurs like "Dimetrodon". According to this author, "Amargasaurus" might also have possessed such a sail, which might have been used for display. Unlike those of pelycosaurs, the neural spines of "Amargasaurus" were bifurcated, forming a double row along the neck and back. As the space between both rows was merely , the existence of two parallel sails seems unlikely. Instead, Bailey suggested the spines represented a scaffold which was completely enveloped by a single skin. Neural spines from the dorsal vertebra to the foremost tail vertebrae also were strongly elongated, but different in structure, forming a single row of paddle-shaped projections. According to Bailey, these projections resembled those of modern humped ungulates such as the bison, indicating the presence of a fleshy hump above the hips. Bailey suggested similar humps for other dinosaurs with strongly elongated neural spines, such as "Spinosaurus" and "Ouranosaurus".