Order Rodentia - Family Muridae 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 1189 1531 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Dasymys montanus Thomas 1906 Dasymys montanus Thomas 1906 , Ann. Mag. Nat. Hist., ser. 7, 18: 143 . Type Locality: Uganda , Ruwenzori East, Mubuku Valley, 12,500 ft ( 3810 m ); 00°22’N , 30°00’E (W. Verheyen et al., 2003 ). Vernacular Names: Ruwenzori Dasymys . Distribution: Known only from Ruwenzori Mtns, Uganda , between 2600 and 3810 m ( Kerbis Peterhans et al., 1998 ); a montane Western Rift endemic. Conservation: IUCN – Vulnerable. Discussion: Usually included in D. incomtus ( Delany, 1975 ) , but distinguished from that species by its long, fine fur that is very dark over upperparts and dark gray washed with buff on underparts; very short tail; short rostrum; low, squat cranium; wide zygomatic breadth ( Thomas, 1906 a ; specimens in BMNH examined by Musser). Dasymys montanus is replaced by D. incomtus at lower altitudes on the E slopes of the Ruwenzoris, and both are recorded from 2600 m , the lowest point for D. montanus and highest for D. incomtus ( Kerbis Peterhans et al., 1998 ) . Based on multivariate analyses of craniometric traits derived from holotypes , W. Verheyen et al. (2003) suggested that montanus and medius ( holotype from Ruwenzori Mtns at 1800 m ) represented the same population and that both taxa were synonyms of D. incomtus . Our study of holotypes and other series, including the material reported by Kerbis Peterhans et al. (1998) , indicates D. montanus to be a separate species from the lower-altitude D. incomtus ( medius ).