ADICIONES AL CONOCIMIENTO DE PROSCELIDODON BORDAS, 1935 (MAMMALIA, XENARTHRA, SCELIDOTHERIINAE)

MIÑO BOILINI, A. R.; TOMASSINI, R.L.; OLIVA, C; MANERA DE BIANCO, T.

REVISTA BRASILEIRA DE PALEONTOLOGIA

SOC BRASILEIRA PALEONTOLOGIA

Año: 2011 vol. 14 p. 269 - 278

1519-7530

Abstract - Additions to the knowledge of Proscelidodon Bordas (Mammalia, Xenarthra, Scelidotheriinae). The Scelidotheriinae Ameghino subfamily constitutes a little diversified monofiletic group within the Mylodontidae Gill, with a biochron that spans from the middle Miocene to the early Holocene. During the Huayquerian-Chapadmalalan period (Late Miocene-Middle Pliocene) the Scelidotheriinae are only represented by the genus Proscelidodon Bordas, being P. patrius (Ameghino) the only species recognized for the Montehermosean Stage/Age (Late Miocene-Early Pliocene). Due to the scarcity of findings, the knowledge of the Neogene taxa incuded in this subfamily is limited, especially regarding the anatomical study of the postcranial skeleton. In this opportunity, we present the finding of a left hind limb partially complete in good condition of conservation, of an adult individual, assigned to Proscelidodon cf. P. patrius (MD-FM-08-23). The materials were unearthed from the fluvial deposits of Monte Hermoso Formation (Buenos Aires, Argentina), in silty levels that represent flooding plain facies and that, biostratigraphically, correspond to Montehermosean Stage/Age. The detailed anatomical study of the different skeletal elements recovered, added to the comparison with other representative elements of this subfamily, provides novel data about the poscranial characteristics of Proscelidodon Bordas and allows us to evaluate its taxonomic and paleoceologic implications.