leg bone) has been recovered that is about long. When compared to the same bone in related dinosaurs, this indicates that Agustinia may have been about long. The lower half of the tibia was thin when viewed from the front (anteroposterior), indicating that the tibia was thinner than that of titanosaurs such as Antarctosaurus or Saltasaurus. The pedal elements are comparable to those of the titanosaurs. The remains are fragmentary and do not have many distinctive characteristics which can be used to separate it from other sauropods. Because of this, some authors have considered Agustinia a nomen dubium for being based on inadequate remains to compare with related dinosaurs. However, Bellardini et al. (2022) considered it to be valid on the basis of unique morphological characteristics observed in the vertebrae. Classification Because of its supposedly unusual armor, Agustinia was originally assigned to its own family, Agustiniidae. This family name has not come into wide acceptance. Agustinia is difficult to classify because of its fragmentary nature, and because it exhibits features of both diplodocoid and titanosaurian sauropods. What few distinctive features do exist in the holotype specimen prompted Kristina Curry Rogers to classify Agustinia as a lithostrotian titanosauria in 2005, but Mannion et al. (2013) classified it as a member of the clade Somphospondyli.<ref name="kristinacurryrogers"/ In contrast, D'emic et al concluded that no diagnostic features are present that would allow a classification within the Diplodocoidea or Titanosauria, and therefore classified Agustinia as an incertae sedis. A 2022 publication by Flavio Bellardini et al. found sufficient evidence to classify Agustinia as a rebbachisaurid within the Diplodocoidea, more derived than Amazonsaurus. The cladogram below displays the results of their phylogenetic analyses: Palaeoenvironment Agustinia is known from the Early Cretaceous Lohan Cura Formation of Neuquén Province, Argentina. Other dinosaurs, including fellow rebbachisaurid Comahuesaurus and somphospondylan Ligabuesaurus have also been named from the formation. Remains of turtles, including two species of Prochelidella, are also known. References Rebbachisaurids Early Cretaceous dinosaurs of South America Cretaceous Argentina Fossils of Argentina Fossil taxa described in 1999 Taxa named by José Bonaparte