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SPECIES Peromyscus difficilis

Author:J. A. Allen, 1891.
Citation:Bull. Am. Mus. Nat. Hist., 3: 298.
Common Name:Southern Rock Deermouse
Type Locality:México, Zacatecas, Sierra de Valparaíso.
Distribution:W Chihuahua and SE Coahuila, south to C Oaxaca, México.
Status:IUCN – Lower Risk (lc).
Comments:P. truei species group. Revised by Hoffmeister and de la Torre (1961) to include nasutus (see species account below) and comanche (transferred to P. truei—Schmidly, 1973). Karyologic and biochemical evidence has suggested that P. difficilis and P. nasutus are sibling species (Avise et al., 1979; Zimmerman et al., 1975, 1978); classified as such by Carleton (1989), but see Janecek (1990), who continued to view nasutus populations as part of P. difficilis. DeWalt et al. (1993b) also noted the somewhat low levels of genetic divergence among attwateri, difficilis, and nasutus (e.g., less than P. gratus versus P. truei) but retained them as species, as did Tiemann-Boege et al. (2000). The matter of their synonymy merits reconsideration and decisive resolution. Gaona (1997) evaluated sex and age variation of populations in Veracruz and Puebla.



    amplus Osgood, 1904
    felipensis Merriam, 1898
    petricola Hoffmeister and de la Torre, 1959
    saxicola Hoffmeister and de la Torre, 1959

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