| Isotemnidae | |
|---|---|
|   | |
| Thomashuxleya | |
| Scientific classification   | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Mammalia | 
| Order: | † Notoungulata | 
| Suborder: | † Toxodontia | 
| Family: | † Isotemnidae Ameghino 1897 | 
| Genera | |
| † Anisotemnus  | |
Isotemnidae is an extinct family of notoungulate mammals known from the Paleocene (Las Flores Formation, Itaboraian) to Middle Miocene (Honda Group, Laventan) of South America. [1]