Nuevos registros de <i>Hippidion</i> (Mammalia, Perissodactyla) en el Pleistoceno tardío de la provincia de Buenos Aires, Argentina

Abstract

RESUMENEn este estudio se describen dos nuevos cráneos referidos a Hippidion principale (Lund) y varios elementos del esqueleto apendicular referidos a H. devillei procedentes de dos localidades clásicas de la provincia de Buenos Aires, las márgenes de los ríos Salado y Quequén Grande. Para la identificación taxonómica de los restos apendiculares, se realizó un análisis multivariante en el que se incluyeron los metacarpianos y falanges descritos y los registrados en varias localidades de Argentina y Brasil. Para la determinación de los cráneos se realizó un estudio comparativo con otros cráneos de diversas localidades. Estos hallazgos incrementan el registro de Hippidion en América del Sur y aportan nuevas evidencias sobre la cronología de sus especies en Argentina. Se realizó una datación por AMS para el ejemplar de Río Salado (MHM-P54) que ha suministrado una edad 14 C 14120 ± 50 BP. En general, los sedimentos portadores en ambas localidades son referibles a la Edad Lujanense, Biozona de Equus (Amerhippus) neogeus. ABSTRACTThis study describes two new skulls referred to Hippidion(Lund) and various elements of the appendicular skeleton referred to H. devillei from two classic localities from Buenos Aires province: the Salado and Quequén Grande Rivers. For taxonomic identification of the appendicular remains was performed a multivariate analysis that included the metacarpals and phalanges described and several remains recorded in various locations in Argentina and Brazil. For the determination of the skulls was made a comparative study with other skulls from different localities. These data increasing the record of Hippidion in South America and provide new evidence about the chronological distribution of two species of Hippidion. One radiometric data was obtained by the method of AMS dating to the skull from Salado River (MHM-P54) about a 14 C age 14120 ± 50 BP. In general, bearing sediments at both localities are referable to the Lujanian Age and the Biozone of Equus (Amerhippus) neogeus.

Quaternary mollusc assemblages from the lower basin of Salado River, Buenos Aires Province: Their use as paleoenvironmental indicators

“…This is surprising, as the basin has historically been the focus of many geological, geochronological and paleontological studies (e.g. Fidalgo et al, 1973Fidalgo et al, , 1981Figini et al, 1995;Fucks et al, 2007Fucks et al, , 2012Fucks et al, , 2015Pomi, 2009;Mari et al, 2013;Prado et al, 2013;Scanferla et al, 2013). Therefore, the aim of this study is to analyze the mollusk assemblages preserved in the Salado River basin in order to (1) evaluate the spatial and temporal variations and (2) reconstruct past environments.…”

Fossil horses from the Late Pleistocene of Tapalqué Creek (Buenos Aires Province, Argentina)

“…Since this publication, notes and articles proliferated, which in most cases do not reflect the global diversity of this group. The several papers of Equidae in South America (Alberdi 1987;Prado et al 1987;Alberdi et al 1989;Alberdi & Prado 1993;Prado & Alberdi 1994;Prado & Alberdi 1996;Prado et al 1998;Prado et al 2000;Alberdi et al 2001a;Alberdi et al 2001b;Alberdi et al 2003;Alberdi & Prado 2004;Prado et al 2005;Prado et al 2013a;Prado et al 2013b;García et al 2018;Prado et al 2018; among others) distinguish two genera: Equus and Hippidion. Each genus has a specific dental morphology, with a clear intraspecific variability.…”

Primer registro de <em>Equus neogeus</em> en río Abaucán (Catamarca, Argentina)

“…Since this publication, notes and articles proliferated, which in most cases do not reflect the global diversity of this group. The recent papers of Equidae in South America (Alberdi, 1987;Alberdi & Prado, 1992, 1993Prado & Alberdi, 1994, 2012Alberdi et al, 1989Alberdi et al, , 2001aAlberdi et al, , b, 2003Prado et al, 1987Prado et al, , 1998Prado et al, , 2000Prado et al, , 2005Prado et al, , 2013a; among others) distinguish two genera: Equus and Hippidion. Each genus has specific dental morphology, with a clear intraspecific variability.…”