Order Rodentia - Family Cricetidae 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 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Megadontomys cryophilus Musser 1964 Megadontomys cryophilus Musser 1964 , Occas. Pap. Mus . Zool., Univ. Michigan , 636: 13 . Type Locality: México , Oaxaca , Distrito de Ixtlán, 13 mi ( 21 km ) NE Llano de las Flores , south slope Cerro Pelón, 9200 ft ( 2804 m ). Vernacular Names: Oaxacan Big-toothed Deermouse . Distribution: Cloud and pine-oak forests in highlands of N Oaxaca , México . Conservation: IUCN – Lower Risk (nt). Discussion: Named as a subspecies of Peromyscus thomasi . Citing morphological traits and genetic differentiation reported by Werbitsky and Kilpatrick (1987) , Carleton (1989) arranged cryophilus as a species. Recent elevational surveys by Briones-Salas et al. (2001) in the Sierra Mazteza and Sánchez-Cordero (2001) in the Sierra Mixteca amplify the geographic occurrence of this species in Oaxaca .