Fósiles de pequeños mamíferos del Plioceno de Chihuahua, México
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Resumen
Los depósitos pliocénicos en el valle del Río Papigochic de Chihuahua proporcionaron 16 taxa de pequeños mamíferos, incluyendo dos nuevos géneros y ocho nuevas especies. Estos fósiles provienen de la fauna Yepómera anteriormente conocida y de edad henfiliana tardía y de un conjunto faunístico superpuesto, nombrado como la fauna Concha, de edad blancana temprana. La presencia de siete especies (cinco nuevas) de roedores cricétidos, incluyendo cinco especies de roedores sigmodontinos en estas faunas, refleja la radiación cenozoica tardía de cricétidos en la parte suroccidental de Norte América. La ausencia de mamíferos sudamericanos en esos conjuntos faunísticos indica que ésta ocurrió antes de que se cerrara el puente terrestre panameño y el gran intercambio americano.
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