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 Sigmodon (Sigmodon) planifrons Nelson and Goldman 1933 Sigmodon (Sigmodon) planifrons Nelson and Goldman 1933 , Proc. Biol. Soc. Wash., 46: 197 . Type Locality: México , Oaxaca State , Juquila, 5000 ft ( 1524 m ). Vernacular Names: Miahuatlan Cotton Rat . Synonyms: Sigmodon (Sigmodon) minor Goodwin 1955 ; Sigmodon (Sigmodon) setzeri Goodwin 1959 . Distribution: As so far known, limited to Sierra de Miahuatlán, S Oaxaca , México . Discussion: Subgenus Sigmodon ( S. hispidus species group?). Described as a species but relegated to a subspecies of S. alleni by Baker (1969) . As noted by Nelson and Goldman (1933 b ) , the diminutive size exhibited by the type series, as well as the material and sympatry later reported by Goodwin (1955 b , 1969 ), suggests that the form is distinct from S. alleni ; renewed study of the Oaxacan taxa named by Goodwin (1955 b ) will prove critical to much-needed revision of the S. alleni complex (see discussion in Carleton et al., 1999).