Oligoryzomys fossil map
Where fossils of Oligoryzomys have been found, shown on the Earth as it looked about 0 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 0 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Early mammals |
|---|---|
| Lived | 3.6 million years ago to the present (Piacenzian to Holocene) |
| Periods | Neogene, Quaternary |
| Family | Cricetidae |
| Named by | Bangs 1900 |
| Fossil records | 28 occurrences at 11 locations (PBDB) |
| Found in | Argentina, Brazil, Saint Vincent and the Grenadines, Peru, Mexico, Venezuela |
| Rock formations | txn:41724, TafĂ del Valle, Botucatu, San Gregorio |
About Oligoryzomys
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 approximately 17 species.
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).
Text in “About” is quoted from the Wikipedia article Oligoryzomys (revision 1311641233), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q244303.
