When discovered, the forelimb was apparently a part of a complete skeleton, however, during excavation the rest of the remains were completely destroyed. In the same publication, Lydekker assigned a partial left femur from Chubut Province, MLP 21, to "Argyrosaurus" but he did not explain his reasoning why he thought the femur was referable to the genus. He also assigned two caudal vertebra centra, MLP 22, from the Santa Cruz Province. After these specimens, other remains were found, including other limb bones, a clavicle, a pubic bone and some tail vertebrae that were referred to the same genus.