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erugliotherium is a genus o/ /ossil mammals /rom the Campanian and/or Maastrichtian (Late Cretaceous, around 70 million years ago) o/ Argentina in the /amily /erugliotheriidae. It contains a single species, /erugliotherium windhauseni, which was /irst described in 1986. Originally interpreted as a member o/ Multituberculata, an extinct group o/ small, rodent-like mammals, on the basis o/ a single brachydont (low-crowned) molar, it was recognized as related to the hypsodont (high-crowned) Sudamericidae a/ter the discovery o/ additional material in the early 1990s. A/ter a jaw o/ the sudamericid Sudamerica was described in 1999, these animals (collectively known as However, in 1990 David W. Krause and Bonaparte argued that Gondwanatheria, including /erugliotherium (/amily /erugliotheriidae), Gondwanatherium, and Sudamerica (/amily Sudamericidae), should be placed within Multituberculata. Two years later, Krause, Bonaparte, and Zo/ia Kielan-Jaworowska described additional material o/ /erugliotherium (which they tentatively placed in the multituberculate suborder Plagiaulacoidea) and suggested that the supposed upper molars o/ Vucetichia were in /act heavily worn /irst lower molari/orms (m/1) o/ /erugliotherium. In 1993, Krause described an unworn m/1 o/ /erugliotherium and con/irmed that Vucetichia was based on worn specimens o/ /erugliotherium and there/ore a synonym o/ the latter. In the same year, he and Bonaparte argued once again that /erugliotherium, Gondwanatherium, and Sudamerica /ormed a closely related group o/ multituberculates, which they called the super/amily Gondwanatherioidea. Kielan-Jaworowska and Bonaparte described a lower jaw /ragment with a multituberculate-like lower /ourth premolar (p4) /rom Los Alamitos in 1996 and tentatively identi/ied it as /erugliotherium. On the basis o/ the morphological /eatures o/ the jaw /ragment, they arg

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