Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Living Organisms (hierarchy name)
4. living organisms (entities)
5. Eukaryota (domain)
6. Animalia (kingdom)
7. Chordata (phylum)
8. Vertebrata (subphylum)
9. Mammalia (class)
10. Perissodactyla (order)
11. Equidae (family)

Anotations

Scope note:

Genus of stocky, stilt-legged, Clydesdale-sized horse that lived in South America during the Ice Age Pleistocene epoch, between 2 million and 10,000 years ago. Hippidion possessed a highly distinctive, long, domed nasal bone. In an alternate classification, the stilt-legged build is seen as similar to the onager and kiang wild asses of Asia, thus suggesting they migrated from Asia across the Bering Strait.