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

MIÑO BOILINI, A. R.; BRANDONI, D.; MONTALVO. C.I.; TOMASSINI, R.L.; BARASOAIN, D.; ZURITA, A.E.

Historical Biology

Taylor and Francis

Año: 2023 vol. 35 p. 1435 - 1443

0891-2963

Among extinct sloths Nothrotheriidae nothrotheriines are characterized 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.