Reig's tuco-tuco is a species of rodent

Rodent

Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing....

 in the family Ctenomyidae. It is endemic to central Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

, where it is known only from a grassland location in Cordoba Province

Córdoba Province (Argentina)

Córdoba is a province of Argentina, located in the center of the country. Neighboring provinces are : Santiago del Estero, Santa Fe, Buenos Aires, La Pampa, San Luis, La Rioja and Catamarca...

 at an elevation above 2000 m in the Sierras Grandes. The species is threatened by disruption of its habitat by fire and sheep grazing. It is named after Argentine biologist Osvaldo Reig

Osvaldo Reig

Osvaldo Alfredo Reig, , was an Argentine biologist and paleontologist. He was born in Buenos Aires, Argentina....

(1929–1992).