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Large vesper mouse
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Cricetidae
Subfamily:	Sigmodontinae
Genus:	Calomys
Species:	C. callosus
Binomial name
Calomys callosus Rengger, 1830

The large vesper mouse (Calomys callosus) is a South American rodent species of the family Cricetidae.

It is found in Argentina, Bolivia, Brazil and Paraguay.

Its karyotype has 2n = 50 and FN = 66. It was formerly synonymized with C. expulsus, but the latter has 2n = 66 and FN = 68.

It is particularly notable as the vector of Bolivian hemorrhagic fever.

References

1. Dunnum, J.; Vargas, J.; Bernal, N.; D'Elia, G.; Pardinas, U. & Teta., P. (2008). "Calomys callosus". IUCN Red List of Threatened Species. 2008. Retrieved 31 March 2009.{{cite iucn}}: old-form url (help)
2. ^ Musser, G. G.; Carleton, M. D. (2005). "Superfamily Muroidea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 1106–1107. ISBN 978-0-8018-8221-0. OCLC 62265494.

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• IUCN Red List least concern species
• Calomys
• Mammals of Argentina
• Mammals of Bolivia
• Rodents of Brazil
• Mammals of Paraguay
• Mammals described in 1830
• Taxa named by Johann Rudolph Rengger
• Sigmodontinae stubs