NUEVO TIPO DE MORFOLOGIA DENTARIA EN UN CARDIATHERIINAE (RODENTIA, HYDROCHOERIDAE) DEL PLIOCENO INFERIOR DE HUACHIPAMPA (SAN JUAN)

Rosendo Pascual, Pedro Bondesio

Abstract


In the present paper a new genus of Cardiatheriinae, Xenocardia dir;ersidens, found in the Huachipampa Formation, San Juan Province, Argentina, is described. The age of the formation (Lower Pliocene) allows to make correlations with the Chasico Formation (Buenos Aires Province) and the "Estratos de Los Llanos" (San Luis Province). The study of the upper cheek-teeth reveals a new tooth structure which differs from all known Cardiatheriinae and therefore the diagnosis previously established by us is enlarged. This new Cardiatheriinae, in view of its morphology, represents a divergent evolutive line from all other members of the group known so far, probably in relation to a new adaptative type.

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