Nuevas consideraciones sobre una asociación ictiofaunística del Pleistoceno Tardío del Río Quequén Salado, provincia de Buenos Aires, Argentina

Abstract

In this contribution, novel materials belonging to an icthyofaunistic association from the Superior Pleistocene of the Quequén Salado River, province of Buenos Aires, Argentina, are described. Eight different taxons are registered, including: Corydoradinae “morfotype Quequén Salado”, Synbranchus sp., Rhamdia sp., Odonthestes sp., Pogonias cromis, cf. Micropogonias furnieri, cf. Mugil sp., and aff. Clupeidae indet. Moreover, most of the skeleton of the conspicuous species P. cromis, possibly one of the most abundant bony fish in the record of the Pleistocene from Buenos Aires, is also described in a very detailed way. We consider Corydoradinae “morfotype Quequén Salado” as a probable new species, possibly extinct by the end of the Pleistocene. Finally, surveys of actual icthyofauna in mixohaline streams allow to corroborate the existence in the province of Buenos Aires, of an ictiologic association comparable to the one registered in the fossil site. This permits the disallowance of previous studies which proposed the Pleistocenic ictiofaunistic assembly of the Quequén Salado River as a non-analogous association compared to the ones currently registered in neighboring geographic areas.