{{Short description|Species of rodent}} {{Speciesbox | name = Large vesper mouse | status = LC | status_system = IUCN3.1 | status_ref = <ref name=iucn>{{cite iucn|author=Dunnum, J.|author2=Vargas, J.|author3=Bernal, N.|author4=D'Elia, G.|author5=Pardinas, U.|author6=Teta, P.|name-list-style=amp|year=2016|title=''Calomys callosus''|errata=2017|article-number=e.T3611A115065498|doi=10.2305/IUCN.UK.2016-3.RLTS.T3611A22334720.en|access-date=8 March 2025}}</ref> | genus = Calomys | species = callosus | authority = Rengger, 1830 }}
The '''large vesper mouse''' ('''''Calomys callosus''''') is a South American rodent species of the family Cricetidae.<ref name = MSW3>{{MSW3 Muroidea | id = 13000616 | pages = 1106–1107}}</ref>
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.<ref name = MSW3/>
It is particularly notable as the vector of Bolivian hemorrhagic fever.
==References== {{Reflist}}
{{Taxonbar|from=Q309323}}
Category:Calomys Category:Mammals of Argentina Category:Mammals of Bolivia Category:Rodents of Brazil Category:Mammals of Paraguay Category:Mammals described in 1830 Category:Taxa named by Johann Rudolph Rengger
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