Oligoryzomys microtis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Oligoryzomys microtis
Species Authority: (Allen, 1916)
Common Name(s):
English Small-eared Pygmy Rice Rat

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Patton, J., Weksler, M., Bonvicino, C. & Percequillo, A.
Reviewer(s): Amori, G. (Small Nonvolant Mammal Red List Authority) & Schipper, J. (Global Mammal Assessment Team)
This species is listed as Least Concern in because of its wide distribution, presumed large population, occurrence in a number of protected areas, tolerance to some degree of habitat modification, and because it is unlikely to be declining at nearly the rate required to qualify for listing in a threatened category.

Geographic Range [top]

Range Description: The species occurs throughout northwestern Brazil, south of the Solimoes-Amazon Rivers, and in the contiguous lowlands of Peru and Bolivia (Musser and Carleton 2005).
Bolivia, Plurinational States of; Brazil; Paraguay; Peru
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species is extremely common in the appropriate habitat.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: This species occurs in tropical rainforest; it is found on primary, forest edges and secondary growth habitats. Although this species is distributed widely within the Rio Juruá basin (Brazil), it has a very restricted and unique habitat range. It is thought that animals grow rapidly and reach maturity quickly, breeding in successive bouts, in the dry season. Litter sizes based on embryo counts ranged from 2 to 8, with a mode of 4.
Systems: Terrestrial

Threats [top]

Major Threat(s): There are no major threats.

Conservation Actions [top]

Conservation Actions: This species occurs in several protected areas.

Bibliography [top]

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: Patton, J., Weksler, M., Bonvicino, C. & Percequillo, A. 2008. Oligoryzomys microtis. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 03 September 2015.
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