UN NUEVO ECHIMYIDAE (RODENTIA, HYSTRICOGNATHI) DE LA EDAD COLHUEHUAPENSE DE PATAGONIA Y CONSIDERACIONES SOBRE LA SISTEMATICA DE LA FAMILIA

María Guiomar Vucetich, Diego H. Verzi

Abstract


Willidewu esteparius gen. et sp. nov., from the Colhuehuapian Age (late Oligocene-early Miocene?) of Patagonia, is described. Some of its characlers such as high and wide rostrum with large incisive foramen, unilateral hypsodonty, p4 smaller than molars and oblique lophs in M1-3 are only shared with Gaimanomys, Sallamys and Carterodon suggesting that these genera could be grouped in a new subfamily. Nevertheless, the systematics of the Echimyidae is so unstable that a new name for this group is not proposed until a revision of the whole family is completed. Cranial morphology of Willidewu and Gaimanomys suggests that they could have been semifossorial rodents inhabiting open environments.

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