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. Artiodactyla (order)
11. Hippopotamidae (family)
12. Hexaprotodon (genus)

Anotations

Scope note:

Species of thick-skinned, herbivorous, even-toed hoofed mammals, significantly smaller than the common hippopotamus, native to the forests and swamps of western Africa; thought to be the only surviving species of their genus, as the Malagasy pigmy hippopotamus is presumed extinct.