This rock mouse is recorded from southern Angola and northern Namibia. Compared with P. collinus, it is described as larger, darker and less silky-furred.
Compared with Petromyscus collinus, it is described as larger, darker in fur and less silky in texture.
Reported settings include rocky shrubland, inland cliffs and mountain peaks. Records are scattered across the southern escarpment and adjacent uplands.
An extinction-risk assessment has not been added yet.