Menucocelsior arriagadai Aranciaga Rolando et al., 2021 (new genus and species)
(Tail vertebra of Menucocelsior arriagadai, from Aranciaga Rolando et al., 2021)
Meaning of name: Menucocelsior = major waterhole [referring to the Salitral Ojo de Agua fossil site where it was found]; arriagadai = for "Beto" Arriagada and his family [owners of the farmland containing the fossil site]
Age: Late Cretaceous (Maastrichtian)
Where found: Allen Formation, Río Negro, Argentina
How much is known: A number of tail vertebrae and a few limb bones.
Notes: Menucocelsior was a titanosaurian sauropod. Although it is not very completely known, it exhibits a combination of features that do not clearly indicate a close relationship with any previously described titanosaur. At least three other species of titanosaurs have been discovered at the same fossil site, suggesting that Menucocelsior lived in an environment productive enough to support several species of large herbivorous dinosaurs.
Reference: Aranciaga Rolando, M., J.A. Garcia Marsà, F.L. Agnolín, M.J. Motta, S. Rozadilla, and F.E. Novas. 2021. The sauropod record of Salitral Ojo del Agua: a [sic] Upper Cretaceous (Allen Formation) fossiliferous locality from northern Patagonia, Argentina. Cretaceous Research advance online publication. doi: 10.1016/j.cretres.2021.105029