Mcdonaldocnus fossil map
Where fossils of Mcdonaldocnus have been found, shown on the Earth as it looked about 5 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 5 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 | 20.45–3.6 million years ago (Burdigalian to Zanclean) |
| Periods | Neogene |
| Family | Nothrotheriidae |
| Named by | Gaudin et al. 2022 |
| Fossil records | 18 occurrences at 9 locations (PBDB) |
| Found in | Argentina, Bolivia |
| Rock formations | Cerro Azul, txn:134630, Mauri, Toro Negro, Collón Curá, Arroyo Chasicó |
About Mcdonaldocnus
Mcdonaldocnus is an extinct genus of nothrotheriid ground sloths that lived during the Middle Miocene and Early Pliocene of what is now Bolivia and Argentina. It was originally placed in the genus Xyophorus but was subsequently recognized as a distinct genus by Gaudin and colleagues in 2022. The authors reassigned the material of "Xyophorus" bondesioi, Xyophorus villarroeli and Xyophorus sp. to Mcdonaldocnus. Fossils of Mcdonaldocnus have been found in the Cerro Azul Formation of Argentina.
Text in “About” is quoted from the Wikipedia article Mcdonaldocnus (revision 1293366359), 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: Q112123888.
