A rice rat recorded in eastern Panama. The Mammal Diversity Database uses Nephelomys pirrensis; the 1913 original description used Oryzomys pirrensis.
The original description reports a dark-brown mid-back, gray throat, buff underparts, dark nose and ears, and a dark upper tail.
The original account records it in heavy forest near the upper Río Limón and describes holes under rocks or logs along stream banks and animal runways.
An extinction-risk assessment has not been added yet.