Guiomys fossil map
Where fossils of Guiomys have been found, shown on the Earth as it looked about 15 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 15 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 | 20.45–11 million years ago (Burdigalian to Tortonian) |
| Periods | Neogene |
| Named by | Pérez 2010 |
| Fossil records | 10 occurrences at 5 locations (PBDB) |
| Found in | Bolivia, Argentina, Peru |
| Rock formations | txn:NF, Yahuarango, Collón Curá |
About Guiomys
Guiomys is an extinct genus of cavioid rodent which lived in west central Patagonia of Argentina (Collón Curá Formation), Bolivia (Honda Group) and Peru (Yahuarango Formation) during the Middle Miocene (Laventan). Guiomys is known from mandibular and maxillary fragments with molars, and isolated cheek teeth. It was first named by María E. Pérez in 2010 and the type species is Guiomys unica.
Text in “About” is quoted from the Wikipedia article Guiomys (revision 1280016983), 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: Q5616633.
