Ctenomys viperinus is a rodent recorded from Tucumán, northwestern Argentina. Nine specimens cited in its description had shorter tails than head-and-body lengths.
The nine specimens cited in Thomas’s original description had head-and-body lengths of 173–202 mm and tail lengths of 69–79 mm.
Specimens were collected at Ñorco and Cerro de Tafí Viejo. The collector reported that specimens were easier to catch at Tafí Viejo than at Ñorco.
An extinction-risk assessment has not been added yet.