LOS CARDIATHERIlNAE (RODENTIA, CAVIOMORPHA) 
DE LA FORMACION ARROYO CHASICO (PLIOCENO INFERIOR) DE LA PROVINCIA DE BUENOS AIRES

Rosendo Pascual, Pedro Bondesio

Abstract


The most ancient Cardiatheriinae (Rodentia, Hydrochoeridae) from the Arroyo Chasicó Formation (Lower Pliocene) are described. Besides an almost complete mandible most of the material so far known are isolated cheek-teeth, which represent at least two species: Procardiatberiurn chasicoense n. sp. and ¿Cardiatherium dubium. Its relationships and its.bearing on the problem of the Hydrochoerinae differentiation are analyzed.

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