Sigmodon alstoni ()
Mass: 67.1 g based on Voss 1992
Habitats: tropical/subtropical savanna (1)
only
Found in one sample
Venezuela: Fundo Pecuario Masaguaral
Size measurements:
| body mass | 67.1 g | N = 33 | Voss 1992 |
| ♀ condyloincisive length | 26.5 mm | N = 1 | Thomas 1914 |
| ♀ ear length | 18 mm | N = 1 | Thomas 1914 |
| ♀ head and body length | 115 mm | N = 1 | Thomas 1914 |
| ♀ hind foot length | 25 mm | N = 1 | Thomas 1914 |
| ♀ skull length | 29 mm | N = 1 | Thomas 1914 |
| ♀ skull width | 17 mm | N = 1 | Thomas 1914 |
| ♀ tail length | 80 mm | N = 1 | Thomas 1914 |
| ♀ upper tooth row length | 5 mm | N = 1 | Thomas 1914 |
See also Sigmodon, Sigmodon alleni, Sigmodon curtisi, Sigmodon fulviventer, Sigmodon hispidus, Sigmodon hudspethensis, Sigmodon inopinatus, Sigmodon mascotensis, Sigmodon medius, Sigmodon minor, Sigmodon sp., Sigmodon toltecus, Sigmodon zanjonensis