Abstract

OLIVA, Cristian  and  BRANDONI, Diego. First record of Mylodontinae (Tardigrada, Mylodontidae) from the Huayquerian (Late Miocene) of Buenos Aires province, Argentina. Rev. Mus. Argent. Cienc. Nat. [online]. 2012, vol.14, n.2, pp.325-332. ISSN 1853-0400.

: The Mylodontinae (Xenarthra, Mylodontidae) are well represented in the late Miocene (Chasicoan-Huayquerian) and Pliocene (Montehermosan-Chapadmalalan) of South America (with more of a dozen of genera recognized). For the Huayquerian Stage/Age of Argentina the diversity is high (about ten species documented). However, there are not certain records of the subfamily in the Buenos Aires province during the Huayquerian. In this work are described new remains of a Mylodontinae assignable to cf. Simomylodon Saint-André, Pujos, Cartelle, De Iuliis, Gaudin, McDonald & Mamani Quispe, which come from the early Huayquerian of the locality of Arenas Blancas (lower course of Chasicó creek, Buenos Aires province) and constitute the first certain record of a Mylodontidae Mylodontinae for the Huayquerian in this province. Simomylodon was recorded in the Neogene of Bolivia, so the probable presence of this genus in the Buenos Aires province increases notably their geographic distribution.

Keywords : Ground sloths; Mylodontinae; Huayquerian; Buenos Aires province.