Bonatitan reigi is an extinct genus of titanosaur known from the Allen Formation of Rio Negro Province, Argentina. It lived from the Campanian to Maastrichtian ages of the Late Cretaceous, sometime around 70 million years ago. It is known from a brain case and partial other skeletal remains from two individuals, and it lived alongside many other dinosaurs such as Saltasaurus, Laplatasaurus, Aeolosaurus, Kelumapusaura, Bonapartesaurus,Lapampasaurus, Willinakaqe, Austroraptor, Niebla, Bonapartenykus, Lamarqueavis, Limenavis, Menucocelsior, Panamericansaurus, Patagopelta , Pellegrinisaurus, Quilmesaurus, Rocasaurus and the pterosaur Aerotitan.
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