INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
FIRST RECORD OF MESOTHERIIDAE IN THE LATE OLIGOCENE OF MENDOZA PROVINCE, ARGENTINA
ASOCIACION PALEONTOLOGICA ARGENTINA
Lugar: Buenos Aires; Año: 2014 vol. 51 p. 366 - 366
This paper deals with the description of the first remains of Mesotheriidae (Notoungulata) in the faunal association of Quebrada Fiera, Mendoza, Argentina. The speciemen, MCNAM-PV 4963, is identified as Trachytherus cf. T. spegazzinianus. It shows closer affinities with this Patagonian species than with the Bolivian T. alloxus or T. subandinus. However, the only recovered specimen presents some differences on the forst incisors and the inclination of transverse lophs of M1 with respect to T. spegazzinianus, which prevents a complete identification with this taxon. This determination adds to other elements from the Quebrada Fiera fauna shared with Deseadan taxa from Patagonia, but also with those from lower latitudes, because T. spegazzinianus has been also recognized in Bolivia at the Lacayani locality. In this sense, its presence in Mendoza fills a gap in the expected geographical distribution of this mesotheriid. The scanty record of mesotheriids in Quebrada Fiera contrasts with the representation of other notoungulates within the recovered sample, such as archaeohyracids or hegetotheriids, as well as with other Deseadan faunas. This can be a peculiarity of this assemblage, but could also be due to taphonomic factors.