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.
Notiomys edwardsii, also known as Edward's long-clawed akodont, Milne-Edwards' long-clawed mouse, or Edwards's long-clawed mouse, is a rodent in the tribe Abrotrichini from southern Argentina. It is the only species in the genus Notiomys, although species of Chelemys and Geoxus were formerly included in that genus.
Akodon azarae, also known as Azara's akodont or Azara's grass mouse, is a rodent species from South America. It is found from southernmost Brazil through Paraguay and Uruguay into eastern Argentina. It is named after Spanish naturalist Félix de Azara.
The Paraná grass mouse is a South American rodent species of the family Cricetidae. It is found in northeastern Argentina and southeastern Brazil.
Oligoryzomys nigripes, also known as the black-footed colilargo or the black-footed pygmy rice rat, is a rodent in the genus Oligoryzomys of family Cricetidae. It is found from Pernambuco in northeastern Brazil through the Atlantic Forest and Cerrado into Paraguay, Uruguay, and Argentina, where it occurs in the provinces of Chaco, Misiones, and Buenos Aires.
Waterhouse's swamp rat is a semiaquatic rodent species from South America. It is found in southern Brazil, Uruguay and northern Argentina, where it lives in freshwater and salt marshes, as well as open grassland of the pampas. Its karyotype has 2n = 24, substantially lower than its closest relative S. aquaticus with 2n = 32.
Akodon boliviensis, also known as the Bolivian grass mouse or Bolivian akodont, is a species of rodent in the family Cricetidae. It is found in the Andes from southeastern Peru through Bolivia into northwestern Argentina.
Abrothrix lanosus, also known as the woolly grass mouse or woolly akodont, is a species of rodent in the family Cricetidae. It is found in southern Argentina and Chile. It was previously classified in the genus Akodon rather than Abrothrix.
Akodon spegazzinii, also known as Spegazzini's akodont or Spegazzini's grass mouse, is a rodent in the genus Akodon found in northwestern Argentina. It occurs in grassland and forest at 400 to 3,500 m above sea level. After the species was first named in 1897, several other names were given to various populations now included in A. spegazzinii. They are now all recognized as part of a single, widespread and variable species. Akodon spegazzinii is related to Akodon boliviensis and other members of the A. boliviensis species group. It reproduces year-round. Because it is widely distributed and common, Akodon spegazzinii is listed as "least concern" on the IUCN Red List.
Chelemys macronyx, also known as the Andean long-clawed mouse or Andean long-clawed akodont, is a species of rodent in the genus Chelemys of family Cricetidae. It is native to Argentina and Chile, where it is found in Patagonian Nothofagus forest and adjacent grasslands.
Chelemys megalonyx, also known as the large long-clawed mouse or large long-clawed akodont is a species of rodent in the genus Chelemys of family Cricetidae. It is endemic to central Chile.
Abrothrix andinus, also known as the Andean Altiplano mouse or Andean akodont, is a species of rodent in the genus Abrothrix of family Cricetidae. It is found in the Altiplano habitat of the Andes from central Peru through Bolivia south to Argentina and Chile.
Geoxus valdivianus, also known as the long-clawed mole mouse or Valdivian long-clawed akodont, is a species of rodent in the tribe Abrotrichini of family Cricetidae found in the Valdivian temperate rain forests and Magellanic subpolar forests of Argentina and Chile. It is one of two species in the genus Geoxus.
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.
Oligoryzomys brendae, also known as Brenda's colilargo, is a South American species of rodent in the genus Oligoryzomys. It is found only in Tucumán Province in northwestern Argentina, but its taxonomic status requires revision.
Oligoryzomys fornesi, also known as Fornes' colilargo, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found from northeastern Brazil via Paraguay into northeastern Argentina. Its karyotype has 2n = 62 and FNa = 64.
Brucepattersonius guarani, also known as the Guaraní akodont or Guaraní brucie, is a South American rodent in the genus Brucepattersonius. It is known from a single specimen from Misiones Province in northeastern Argentina, at the southern end of the Atlantic Forest. The species is protected by Moconá Provincial Park but is threatened by deforestation in nearby areas.
Brucepattersonius misionensis, also known as the Misiones akodont or Misiones brucie, is a rodent species from South America in the genus Brucepattersonius. It is known from a single individual collected in Misiones Province in northeastern Argentina. Its taxonomic status remains to be determined conclusively. It is threatened by habitat loss and is not known from any protected areas.
Abrotrichini, also known as the Andean clade or southern Andean clade, is a tribe of rodents in the subfamily Sigmodontinae. It includes about fifteen species in four genera, distributed in South America from southern Peru to southernmost South America, including the Patagonian steppes. The earliest known fossils are from the Pliocene of Argentina.
