Proterotheriidae
| Proterotheriidae Temporal range: | |
|---|---|
| Skeleton of Thoatherium | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Litopterna |
| Suborder: | †Lopholipterna |
| Superfamily: | †Proterotherioidea |
| Family: | †Proterotheriidae Ameghino 1887 |
| Synonyms | |
| |
Proterotheriidae is an extinct family of litoptern ungulates known from the Eocene-Late Pleistocene of South America. Members of the group were small-medium sized cursorial herbivores with brachydont teeth, with their toes showing progressive reduction, with later members of the group bearing weight on a single large toe similar to living horses.