Ferugliotherium is a genus of fossil mammals from the Campanian and/or Maastrichtian (Late Cretaceous, around 70 million years ago) of Argentina in the family Ferugliotheriidae. It contains a single species, Ferugliotherium windhauseni, which was first described in 1986. Originally interpreted as a member of Multituberculata, an extinct group of small, rodent-like mammals, on the basis of a single brachydont (low-crowned) molar, it was recognized as related to the hypsodont (high-crowned) Sudamericidae after the discovery of additional material in the early 1990s. After a jaw of the sudamericid Sudamerica was described in 1999, these animals (collectively known as Gondwanatheria) were no longer considered to be multituberculates and a few fossils that were previously considered to be Ferug