This large tuco-tuco occurs in scattered areas of northeastern Argentina. It uses sandy patches away from wooded islands, and the cited account reports that population size is strongly affected by annual rainfall cycles.
Head-and-body length averages 20.6 cm (range 19.0-22.4 cm), tail length 9.1 cm (8.6-9.9 cm), and mass 331 g (269-376 g). The back is fairly uniform brown and the underside pale, with white areas behind the ears, at the armpits, and in the groin.
It inhabits isolated sandy patches in the Esteros del Iberá and Pampa ecoregions, away from the wooded islands common in the area. The account reports that population size is strongly affected by annual rainfall cycles.
An extinction-risk assessment has not been added yet.