Common names: Pygmy Rock Mouse, Minute Rock Mouse (English), Dwergklipmuis, Kleinklipmuis, Damaralandse Klipmuis (Afrikaans). Distribution: The Pygmy Rock Mouse has the most extensive range of all Petromyscus species, and is distributed from South Africa’s Succulent- and Nama-Karoo biomes (Figure 1), northwards through western Namibia, including parts of the Namib Desert, and into the southwestern regions of Angola (Skinner & Chimimba 2005; Monadjem et al. 2015). Their altitudinal range limits are from 100 m to 2,000 m asl. Within the assessment region, they occur in rocky outcrops across the western Northern and Western Cape provinces. However, informal surveys have not recently recorded this species in koppies south of Springbok (C.S. Bragg unpubl. data) and so further vetting of museum records and field surveys should be undertaken to determine its current extent of occurrence.