Order Rodentia - Family Nesomyidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 930 955 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Petromyscus shortridgei Thomas 1926 Petromyscus shortridgei Thomas 1926 , Proc. Zool. Soc. Lond., 1926: 302 . Type Locality: Extreme S Angola , Ruacana Falls, 3350 ft ( 1021 m ). Vernacular Names: Shortridge's Pygmy Rock Mouse . Distribution: W and S Angola and N Namibia (S to Erongo Mtns and Okahandja region); limits unknown. Conservation: IUCN – Lower Risk (lc). Discussion: Reviewed by Skinner and Smithers (1990) and de Graaff (1997 ll ). Roberts (1951) treated shortridgei as a subspecies of P. bruchus , and Meester et al. (1986) listed it as a subspecies of P. collinus . However, Thomas’ species description correctly expressed the distinctness of the animal; also see Schlitter ( in Meester et al., 1986 ) and Skinner and Smithers (1990) . The larger size of P. shortridgei , darker fur with a less silky texture, and lack of postaxillary teats clearly separate it from P. collinus , a judgement based upon AMNH and FMNH specimens, which also inform our estimate of its geographic range. Crawford-Cabral (1998) recorded P. shortridgei only from the vicinity of Ruacana Falls, S Angola near the Namibia border, and speculated that the specimen ( AMNH 81915) from farther north at Coporolo represented P. collinus . External and cranial morphology of the Coporolo specimen falls within the range of variation in P. shortridgei (as identified by Hill and Carter, 1941:104 ), not P. collinus . The two species overlap in distribution in SW Angola and N Namibia but have not been collected at the same place.