ASTRAPOTHERIUM FROM THE MIDDLE MIOCENE COLLÓN CURA FORMATION AND THE DECLINE OF ASTRAPOTHERES IN SOUTHERN SOUTH AMERICA
Keywords:Astrapotherium, Rio Negro, Collón Cura Formation, middle Miocene, Systematics
AbstractAstrapotherium is the better-known member of the placental Order Astrapotheria. This large herbivorous inhabited the Patagonian ecosystems during Early and middle Miocene times. The genus is widely represented in the Early Miocene Santa Cruz Formation, with a dozen of nominal species, of which A. magnum and A. burmeisteri are the only ones herein considered as valid. The middle Miocene record was limited to few fragmentary remains from the Rio Frias Formation and presumably from the Collón Cura Formation, described as A. hesperinum Cabrera 1940, here interpreted as nomen vanum. Here we describe an almost complete skull with associated mandible derived from the Collón Cura Formation in the vicinities of Comallo, in Rio Negro Province (Argentina). It is largely the most complete astrapothere material from middle Miocene rocks of high latitudes, and it is referred to a new species, Astrapotherium guillei. It differs from the remaining species essentially in lacking P3, achieved convergently with the latest diverging uruguaytheriines. The astrapotheriines diversified in high latitudes during the Early Miocene, but they retained an stereotyped morphotype and became progressively less diverse, unlike their Northern counterparts (the Uruguaytheriinae). Astrapotherium guillei is the latest known Patagonian astrapothere and represents the final expression of the Astrapotheriinae´s decline. doi: 10.5710/AMGH.15.07.2019.3258
How to Cite
Authors publishing in Ameghiniana have the option of making their article freely available online. Authors opting for the Open Access must pay a fee of $300 (US dollars) to cover article-processing costs and to ensure the article is made open access. Please contact the Production Team after the acceptance of your manuscript if you are interested in making your article Open Access. This option implies by default a license Creative Commons Attribution Non-Commercial-NoDerivs License (CC BY NC ND). If your funding institution requires a different licensing option please communicate this to the Production Team after the acceptance of your manusctipt.