Microryzomys altissimus


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Microryzomys altissimus
Species Authority: (Osgood, 1933)
Common Name(s):
English Highland Small Rice Rat, Páramo Colilargo
Taxonomic Notes: The Colombian distribution may be a separate species.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Gómez-Laverde, M., Rivas, B. & Delgado, C.
Reviewer(s): Amori, G. (Small Nonvolant Mammal Red List Authority) & Schipper, J. (Global Mammal Assessment Team)
This species is listed as Least Concern in view of its wide distribution, presumed large population, and because it is unlikely to be declining at nearly the rate required to qualify for listing in a threatened category. The Colombian distribution is likely to be a distinct species which may qualify for inclusion in a threat category, however, taxonomic review is required.

Geographic Range [top]

Range Description: This species occurs in the Andes of Colombia, Ecuador, and Peru, mostly 2,500 to 4,000 m (Musser and Carleton, 2005).
Colombia; Ecuador; Peru
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It can be locally common.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This species occurs in the subalpine and páramo formations (Musser and Carleton, 2005). Little is known of the behavior of this species, but it is probably similar to other member of the genus (M. minutus).
Systems: Terrestrial

Threats [top]

Major Threat(s): Major threats are deforestation and agriculture in páramo areas in some parts of its range (R. Anderson pers. comm.).

Conservation Actions [top]

Conservation Actions: It occurs in a number of protected areas in the southern distribution but only one in the northern distribution.

Bibliography [top]

IUCN. 2008. 2008 IUCN Red List of Threatened Species. Available at: (Accessed: 5 October 2008).

Musser, G. G. and Carleton, M. D. 2005. Superfamily Muroidea. In: D. E. Wilson and D. A. Reeder (eds), Mammal Species of the World: a geographic and taxonomic reference, pp. 894-1531. The John Hopkins University Press, Baltimore, USA.

Citation: Gómez-Laverde, M., Rivas, B. & Delgado, C. 2008. Microryzomys altissimus. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 30 August 2015.
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