Neha Patil


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Kingdom  Animalia
Scientific name  Oligoryzomys
Higher classification  Sigmodontinae
Order  Rodent
Family  Cricetidae
Phylum  Chordata
Rank  Genus
Oligoryzomys httpss3postimgorg5nvka1mzn9140746928c0261f
Lower classifications  Oligoryzomys longicaudatus, Oligoryzomys fulvescens, Oligoryzomys nigripes, Oligoryzomys flavescens, Oligoryzomys microtis

Oligoryzomys is a genus of rodents in the tribe Oryzomyini of family Cricetidae. Many species are known as pygmy rice rats or colilargos. The genus is found from Mexico to Tierra del Fuego and includes about 17 species.


Oligoryzomys MATO GROSSO COLILARGO Oligoryzomys matogrossae FAUNA PARAGUAY

In Argentina and Chile Oligoryzomys longicaudatus and other members of the genus represent the reservoir for the hantavirus strain Andes virus (ANDV) (Wells et al., 1997; Levis et al., 1998; Cantoni et al., 2001).

Oligoryzomys CalPhotos Oligoryzomys longicaudatus Colilargo


Oligoryzomys Oligoryzomys flavescens Paulo Ricardo de Oliveira Roth Flickr

The genus Oligoryzomys is included in the subfamily Sigmodontinae of the family Cricetidae. The genus is placed in the Oryzomyini tribe, first proposed by Oldfield Thomas in the early 20th century. It includes genera which have certain dental features of the upper and lower molars and a long palate which extends past the third molars. More recently, molecular analysis and morphological data has placed the genus in Clade C, alongside Neacomys, Microryzomys and Oreoryzomys.


Oligoryzomys Species Sheet Mammals39Planet

Pygmy rice rats are very small rodents, with a head-and-body length of between 70 and 110 mm (2.8 and 4.3 in) and a tail length of between 85 and 155 mm (3.3 and 6.1 in). They are greyish-brown or reddish-brown animals that resemble members of the genus Oryzomys in appearance. They differ from Oryzomys in being mostly terrestrial rather than semi-aquatic and in having longer tails in proportion to their body size. The females have four pairs of mammary glands. The snout is pointed, the ears are rounded and the long slender tail is hairless.


Oligoryzomys Oligoryzomys Wikipedia

Pygmy rice rats occupy a range of habitats including tropical forests, dry forests, plantations, scrubland, mountain grassland, agricultural land, gardens and houses. They are nocturnal and solitary and feed mainly on seeds, insects and fruits. They are mostly found on the ground but can climb into the undergrowth. They can be agricultural pests, particularly in rice fields.

Oligoryzomys BOLD Systems Taxonomy Browser Oligoryzomys flavescens species

Some species such as O. flavescens and O. longicaudatus are the principal reservoir host of certain hantaviruses which are harmless to rodents but can cause disease in humans.

Literature cited

Oligoryzomys Species Sheet Mammals39Planet
  • IUCN. 2009. 2009 IUCN Red List of Threatened Species. IUCN. Version 2009.2. Retrieved on December 8, 2009.
  • Musser, G.G. and Carleton, M.D. 2005. Superfamily Muroidea. Pp. 894–1531 in Wilson, D.E. and Reeder, D.M. (eds.). Mammal Species of the World: a taxonomic and geographic reference. 3rd ed. Baltimore: The Johns Hopkins University Press, 2 vols., 2142 pp. ISBN 978-0-8018-8221-0
  • Weksler, M. 2006. Phylogenetic relationships of oryzomyine rodents (Muroidea: Sigmodontinae): separate and combined analyses of morphological and molecular data. Bulletin of the American Museum of Natural History 296:1–149.
  • References

    Oligoryzomys Wikipedia

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