Concise hierarchy
(Kingdom) Animalia - (Phylum) Chordata - (Class) Mammalia - (Order) Notoungulata
Subsequent positions
Original entries
| Questionably †Allalmeia (Genus) Rusconi, 1946 | |
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| Questionably †Brachystephanus (Genus) Simpson, Minoprio & Patterson, 1962 | |
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| Questionably †Brandmayria (Genus) Cabrera, 1935, nom. dub. | |
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| Questionably †Colhuapia (Genus) Roth, 1902, nom. dub. | |
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| Questionably †Colhuelia (Genus) Roth, 1902, nom. dub. | |
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| Questionably †Hermoseodon (Genus) Mercerat, 1917, nom. dub. | |
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| Questionably †Homalodotheriidae (Family) Gregory, 1910 | |
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| Questionably †Isotemnidae (Family) Ameghino, 1897 | |
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| Questionably †Lafkenia (Genus) Roth, 1902, nom. dub. | |
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| Questionably †Leontiniidae (Family) Ameghino, 1895 | |
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| Questionably †Notohippidae (Family) Ameghino, 1894 | |
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| Questionably †Phanotherus (Genus) Ameghino, 1889, nom. dub. | |
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| Questionably †Xenostephanus (Genus) Simpson, Minoprio & Patterson, 1962 | |
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Subsequent entries
Current position
Historical positions
Number of Subtaxa