Bensonomys—Benson Vesper Mouse // Bensonomys arizonae—Arizona Vesper Mouse // Sigmodon—Cotton Rats
This is primarily a South American subfamily. Two genera (Sigmodon and Oryzomys) reach into the U.S., but only the cotton rats inhabit our region.
Synonyms. Calomys (Bensonomys).
Bensonomys has variously been included as a subgenus of Calomys or as a separate genus. A number of species of Calomys currently occur in South America, but the genus doesn't reach our region. Bensonomys appears to share a common ancestor with Peromyscus. With about a dozen species, Bensonomys is widespread in Hemphillian and Blancan deposits.
Late Blancan: Caballo (Morgan et al. 2011).
Literature. Morgan et al. 2011.
Synonyms. Calomys (Bensonomys) arizonae.
Late Blancan: 111 Ranch (Morgan and White 2005); California Wash (Johnson et al. 1975); Curtis Ranch (Morgan and White 2005); Virden (Morgan et al. 2008: cf.).
Literature. Johnson et al. 1975; Morgan and White 2005; Morgan et al. 2008.
Last Update: 21 Oct 2013