New insights on the paleogeographic distribution of the Late Pleistocene ground sloth genus Xibalbaonyx along the Mesoamerican Corridor

摘要

Here we describe the skull of a new species of Megaloychidae (Xenarthra)Xibalbaonyx microcaninusfrom the federal state of Jalisco in west-central Mexico based on a complete skull exhibited in the Museo Regional de Guadalajara (MRG). The specimen was originally collected in the Upper Pleistocene sediment of the Zacoalco paleolake (Jalisco) and is here assigned to the recently established genusXibalbaonyxfrom the Late Pleistocene of Quintana Roo in south-eastern Mexico. The genusXibalbaonyxthus had a wider geographic distribution than previously considered and ranges from central to southern Mexico.