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Calomys callosus

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA RODENTIA CRICETIDAE

Scientific Name: Calomys callosus
Species Authority: (Rengger, 1830)
Common Name/s:
English Large Vesper Mouse
Taxonomic Notes: The taxonomy of this species is in need of revision (J. Dunnum pers. comm.). C. callosus is the species inhabiting the Chaco and associated habitats in southeastern Bolivia (Salazar-Bravo et al. 2003). The populations of Bolivia (Beni) could be a different and unknown species (G. D'Elia pers. comm.)

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor/s: Dunnum, J., Vargas, J., Bernal, N., D'Elia, G., Pardinas, U. & Teta., P.
Reviewer/s: Amori, G. (Small Nonvolant Mammal Red List Authority) & Schipper, J. (Global Mammal Assessment Team)
Justification:
This species is listed as Least Concern in view of its wide distribution, presumed large population, it occurs in a number of protected areas, has a tolerance of a degree of habitat modification, and because it is unlikely to be declining fast enough to qualify for listing in a more threatened category.

Geographic Range [top]

Range Description: This species occurs in east Bolivia, north Argentina (Chaco, Formosa, Jujuy, Salta y Santiago provinces), Paraguay, and contiguous west central Brazil; isolated records in southeast and east Brazil (Mato Grosso and Mato Grosso do Sul States) (see Salazar-Bravo et al., 2002). It is present from lowland to 2,050 m.
Countries:
Native:
Argentina; Bolivia, Plurinational States of; Brazil; Paraguay
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It is a common and very abundant species (Bonvicino pers. comm.). The species experiences large population fluctuations (G. D'Elia pers. comm.).
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: This species occurs in dry and subhumid areas. Calomys callosus is a species of open vegetation formations (Cerrado and Pantanal), especially common in areas disturbed by humans. In Paraguay it was trapped in palm savannas in bunchgrass meadows, and in dry marshes. In the Brazilian caatinga it is found in the later seral stages of old field succession and in low thorn scrub, whereas in central Brazil it is most common where forest has been cleared and grass planted. Animals from central Brazilian population have a gestation period averaging 21.8 days (range 20-23, n = 43), a litter size averaging 4.5 (range 2 to 9, n = 13), and an average neonatal weight of 2.3 g (n = 42). Young open their eyes on the sixth or seventh day, and lactation lasts fifteen to seventeen gays.
Systems: Terrestrial

Threats [top]

Major Threat(s): There are no major threats to this species. There are threats in Brazil from habitat destruction and fragmentation, mainly in the Cerrado region (Bonvicino pers. comm.).

Conservation Actions [top]

Conservation Actions: It is present in many protected areas. The species occurs in Cerro Cora National Park, Paraguay (Salazar-Bravo et al. 2002) and in several protected areas in Brazil (Bonvicino pers. comm.).
Citation: Dunnum, J., Vargas, J., Bernal, N., D'Elia, G., Pardinas, U. & Teta., P. 2008. Calomys callosus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 25 April 2014.
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