Large vesper mouse

The large vesper mouse (Calomys callosus) is a South American rodent species of the family Cricetidae.^[2]

Large vesper mouse
Conservation status
Least Concern  (IUCN 3.1)[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

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.^[2]

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