The Brazilian shrew mouse, also known as the blarinine akodont, is a rodent in the tribe Akodontini from the Atlantic Forest of eastern and southeastern Brazil. It is the only species in the genus Blarinomys. Phylogenetic analysis suggest that there are two clear geographical clades, a northeastern and southeastern.
Necromys is a genus of South American sigmodontine rodents allied to Akodon. This genus has also been known as Cabreramys or more recently Bolomys, and the northern grass mouse has recently been transferred from Akodon.
The large vesper mouse is a South American rodent species of the family Cricetidae.
The gray leaf-eared mouse is a rodent species from South America. It is found in Argentina, Bolivia, Brazil and Paraguay; its habitat includes the Gran Chaco.
The lesser Wilfred's mouse is a species of South American rodents of the family Cricetidae. It was first described by Wilfred H. Osgood under the name Thomasomys pictipes, then into the genus Wilfredomys, and now known as Juliomys pictipes. The lesser Wilfred's mouse is endemic to northeastern Argentina and southeastern Brazil. Its physical appearance ranges from dark brown to light orange coloration and the typical size is small to medium. This species is arboreal, spending most of its time trees and living in the local forests at altitudes from sea level to 2000 m. Currently, this species is listed as Least Concern by the IUCN, but, threats include livestock farming, ranching, and wood harvesting.
The hairy-tailed bolo mouse or hairy-tailed akodont is a South American rodent species of the family Cricetidae. It is found in Argentina, Bolivia, Brazil, and Paraguay.
Akodon budini, also known as Budin's akodont or Budin's grass mouse, is a species of rodent in the family Cricetidae. It is found in the Andes of northwestern Argentina and adjacent Bolivia. The species is named after Emilio Budin, an Argentine specimen collector who worked with Oldfield Thomas.
Olrog's chaco mouse is a species of South American rodent in the family Cricetidae, endemic to Argentina. The natural habitat of the species is hot deserts. Its karyotype has 2n = 60. The species is named after Swedish-Argentine biologist Claes C. Olrog.
Andalgalomys is a genus of rodent in the family Cricetidae. It contains the following species:
Peterson's chinchilla mouse is a species of rodent in the family Cricetidae. It is found in west central and southern Argentina and nearby areas of Chile. The species is named after American paleontologist Olaf A. Peterson (1865–1933).
Oligoryzomys magellanicus, also known as the Patagonian colilargo and the Magellanic pygmy rice rat, is a species of rodent in the genus Oligoryzomys of the family Cricetidae. It is found in the southernmost parts of Argentina and Chile, including Tierra del Fuego and other outlying islands. Its karyotype has 2n = 54 and FNa = 66.
Stirton's deer mouse is a species of rodent in the family Cricetidae. It is found in El Salvador, Guatemala, Honduras, and Nicaragua. P. stirtoni is widely distributed and is presumed to have a large population and a tolerance of habitat destruction, though its biology is poorly understood. The species is named after Ruben A. Stirton (1901-1966), an American zoologist associated with the University of California at Berkeley.
Phyllotis is a genus of rodent in the family Cricetidae. These mice are commonly confused with Auliscomys, Graomys and Loxodontomys.. In order to tell these genera apart, one must look at the tail. Species in the genus Phyllotis have a penicillate tip on their tail which is not present in the other two genera. Tails in the genus Phyllotis are also less than the length of its head and body combined whereas in Graomys, tails are longer than the head and body combined. Phyllotis xanthopygus was found at the summit of Volcán Llullaillaco, which is the highest altitude a mammal has yet been found in nature.
Pearson's tuco-tuco is a species of rodent in the family Ctenomyidae. It is endemic to Uruguay, where it is found at elevations below 200 m. This tuco-tuco constructs burrows with multiple openings containing one to two nests of dried grass; it prefers areas of sandy soil but is somewhat adaptable. It is threatened by loss of habitat to development, agriculture and ranching. Multiple karyotypes have been reported, including 2n = 68–70, FN = 80–88, as well as 2n = 56, FN = 77–79, suggesting the taxon may represent several species. C. dorbignyi appears to be cytogenetically indistinguishable from the 2n = 70 form. The species is named after American zoologist Oliver Payne Pearson.
Roig's pericote or Roig's chaco mouse is a species of rodent in the family Cricetidae. Its karyotype has 2n = 60 and FN = 120. It may be a subspecies of Olrog's chaco mouse.
D'Orbigny's tuco-tuco is a species of rodent in the family Ctenomyidae, named after French naturalist Alcide d'Orbigny. It is found in northeast Argentina. Its karyotype has 2n = 70, FN = 84–88, which is cytogenetically indistinguishable from some populations of C. pearsoni; the latter taxon may actually represent several species.
Geoxus annectens, also known as Pearson's long-clawed akodont or Pearson's long-clawed mouse, is a species of rodent in the tribe Abrotrichini of family Cricetidae. Molecular data suggests that its closest relative is Geoxus valdivianus. Formerly classified in its own genus, Pearsonomys, named after American zoologist Oliver Payne Pearson, it was moved to Geoxus in 2016 after a morphological and genetic reevaluation of the tribe Abrotrichini. This rodent is endemic to Chile, where it is found in Nothofagus forest of the Valdivian temperate rainforest ecoregion.
The Paraguayan bolo mouse or Paraguayan akodont is a species of rodent in the family Cricetidae. According to the IUCN, it is present in Bolivia, Paraguay, and Peru, and possibly also in Argentina and Brazil. It is found at elevations from 300 to 2,030 m in a variety of habitats, including cerrado, chaco, and heath pampas.
The delicate salt flat mouse is a sigmodontine rodent species in the family Cricetidae from South America. It is the only species in the genus Salinomys. Its habitat is scrublands bordering salt flats in the Monte Desert area of central western Argentina at elevations around 400 m. The closest relatives of the species are the chaco mice (Andalgalomys).
Oliver Payne Pearson, or "Paynie" to many that knew him, was an American zoologist and ecologist. Over a very active 50-year career, he served as professor of zoology at UC Berkeley and curator of mammals at the Museum of Vertebrate Zoology. Pearson is best known for his work on the role of predation on vole demography and population cycles, and for his piercing contributions to the biology of South American mammals, but his earlier studies on reproductive and physiological ecology are highly regarded as well.
