Sigmodon (Sigmodon) ochrognathus Bailey 1902

Wilson, Don E. & Reeder, DeeAnn, 2005, Order Rodentia - Family Cricetidae, Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2, Baltimore: The Johns Hopkins University Press, pp. 955-1189 : 1176

Sigmodon (Sigmodon) ochrognathus Bailey 1902

Sigmodon (Sigmodon) ochrognathus Bailey 1902 , Proc. Biol. Soc. Wash., 15: 115.

Type Locality: USA, Texas, Brewster Co., Chisos Mountains, 8000 ft (2438 m).

Vernacular Names: Yellow-nosed Cotton Rat.

Synonyms: Sigmodon (Sigmodon) baileyi J. A. Allen 1903 ; Sigmodon (Sigmodon) madrensis Goldman and M. C. Gardner 1947 ; Sigmodon (Sigmodon) montanus Benson 1940 .

Distribution: SE Arizona, extreme SW New Mexico, and Transpecos, Texas, USA, south to C Durango, México; northern outlier population may persist in Guadalupe Mtns, Transpecos, Texas (see Stangl and Dalquest, 1991).

Conservation: IUCN – Lower Risk (lc).

Discussion: Subgenus Sigmodon , S. hispidus species group. Basal clade within the S. hispidus assemblage according to phylogenetic interpretations of cytochrome b data ( Peppers et al., 2002), not with S. fulviventer and kin ( Baker, 1969). Findley and Jones (1960) detected no consistent pattern of size and pelage color variation to justify recognition of subspecies, a conclusion sustained by the low genetic distances recorded among populations ( Carroll et al., 2002). See Baker and Shump (1978, Mammalian Species, 97).