CONICET | Buscador de Institutos y Recursos Humanos

Until the discovery of the genus Punahyrax (Geste Formation) in different localities of Catamarca and Salta provinces, ?archaeohyracids?were unknown in northwestern Argentina. Here we analyze the record of these notoungulates in the region through specimensknown for the Geste Formation and new remains recovered from the lower levels of the Quebrada de Los Colorados Formation, assessing theirdiversity and significance in the context of the pre-Deseadan radiation of Typotheria. We identify three ?archaeohyracid? morphotypes forBarrancan levels and four for Mustersan levels in northwestern Argentina, implying the possible presence of as much as seven ?archaeohyracid?taxa in the region for the last third of the Eocene, and illustrating a striking diversity, especially considering the scarce pre-Tinguiriricanrecord known until now. These new records underline the faunal differences of the Geste and Quebrada de los Colorados formations regardingthe highly fossiliferous Lower and Upper Lumbrera formations. In this sense, although the existence of a sample bias should not becompletely dismissed, the possibility of important biogeographic barriers acting in the area by the late middle Eocene needs to be analyzedwith independent evidence. The record of Pseudhyrax eutrachytheroides in northwestern Argentina represents the first notoungulate taxoncommon between this region and typical Patagonian localities and represents a useful and presumably reliable new basis for the assignmentof a Mustersan age for the middle section of the Geste Formation.

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