| Patriarchus Temporal range: Early Miocene
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Notoungulata |
| Family: | †Interatheriidae |
| Subfamily: | †Interatheriinae |
| Genus: | †Patriarchus Ameghino, 1889 |
| Type species | |
| †Patriarchus palmidens Ameghino, 1889
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Patriarchus is an extinct genus of interatheriid notoungulates that lived during the Early Miocene in what is now Argentina. Fossils of this genus have been found in the Santa Cruz Formation of Argentina.