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Among extinct sloths, Nothrotheriidae nothrotheriines are characterised by caniniforms (when present) separated by a diastema from the molariform tooth row and quadrangular, rectangular or trapezoidal molariforms with longitudinal grooves on the lingual and labial surfaces. The subfamily Nothrotheriinae is recorded from the Middle Miocene of Bolivia and Argentina to the Pleistocene of different regions of South America, Central America and North America. Neogene well-known representatives include  Pronothrotherium, Huilabradys, Mionothropus, Aymaratherium, Lakukullus  and the recently defined genus  Mcdonaldocnus , whose remains were found from Argentina, Colombia, Uruguay, Peru, Brazil and Bolivia.  Mcdonaldocnus  includes materials from Argentina and Bolivia previously assigned as ‘ Xyophorus ’. New records from Late Miocene levels of the Cerro Azul Formation cropping out in the Chasicó creek locality, Buenos Aires Province, and in the localities of Telén and Loventué, La Pampa Province, allow us to describe cranio-dental remains of Nothrotheriinae  Mcdonaldocnus bondesioi  and  Mcdonaldocnus  sp., respectively. The identification of  Mcdonaldocnus  sp. in the Cerro Azul Formation at La Pampa Province constitutes the first record of Nothrotheriinae for this province.

New cranio-dental remains of Nothrotheriinae (Mammalia, Xenarthra, Folivora) from the Late Miocene of Central Argentina