CRICÉTIDOS (MAMMALIA: RODENTIA) DELPLEISTOCENO TARDÍO DEL NORDESTE DE LA PROVINCIA DE BUENOS AIRES (ARGENTINA). ASPECTOS SISTEMÁTICOS y PALEOAMBIENTALES

Abstract

Several remains of cricetids exhumed from sediments referred to the Late Pleistocene of "de La Reconquista" river (Merlo, Moreno and General Rodríguez counties) have been studied. In fluvial-lacustrine sediments referred to "Bonarian" (sensu Ameghino, 1889), Reithrodon auritus (Fischer, 1814), Oxymycterus sp., Akodon azarae (Fischer, 1829), Calomys cf. C. laucha-C. musculinus and a morphotype of Lundomys similar to L. molitor (Winge, 1887) are registered. In aeolian sediments referred to "Bonarian" (sensu Ameghino, 1889), R. auritus and Reithrodon cf. R. auritus are registered. Finally, in sediments referred to the Guerrero Member of the Luján Formation isensu Fidalgo et al., 1973), a few remains of R. auritus are registered. The paleoenvironmental and paleoecological conditions and the chronology of the sediments are discussed on the basis of the cricetid assemblages and associated fauna. Additionally, some considerations about taphonomy and its impact on the sample are discussed.