The Chromosomes of the Hispid Cotton Rat, Sigmodon hispidus, from Two Localities in Venezuela

Patterns of Chromosomal Evolution in <i>Sigmodon</i>, Evidence from Whole Chromosome Paints

“…They also recognized S. zanjonensis which they concluded may or may not be specifically distinct [Carleton et al, 1999;Musser and Carleton, 2005]. Of these 13 species, karyotypes for 9 (S. alleni , S. arizonae , S. fulviventer , S. hirsutus , S. hispidus , S. leucotis , S. mascotensis , S. ochragnathus , and S. toltecus) [Hsu and Benirschke, 1968;Kiblisky, 1969;Lee and Zimmerman, 1969;Zimmerman, 1970;Carroll et al, 2005] have been described with non differentially stained chromosomes, G-bands, and C-bands [Zimmerman, 1970;Elder, 1980;Elder and Lee, 1985]. Diploid numbers ranged from 22 to 82 and fundamental number (total number of autosomal arms) ranged from 34 to 82; G-band data indicate that S. hispidus , S. leucotis , S. alleni , S. ochragnathus , S. arizonae , and S. mascotensis form a species group to the exclusion of S. fulviventer which Elder and Lee [1985] placed in its own species group.…”