| Ancylocoelus Temporal range: Late Oligocene
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Notoungulata |
| Family: | †Leontiniidae |
| Genus: | †Ancylocoelus Ameghino 1894 |
| Type species | |
| †Ancylocoelus frequens Ameghino, 1894
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| Species | |
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Ancylocoelus is an extinct genus of mammal, belonging to the order Notoungulata. It lived during the Late Oligocene, in what is today Argentina, in South America.