Eopachyrucos
Extinct genus of notoungulates
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Eopachyrucos is an extinct genus of interatheriid notoungulates that lived from the Middle Eocene to the Late Oligocene of Argentina and Uruguay.[1] Fossils of this genus have been found in the Sarmiento Formation of Argentina and the Fray Bentos Formation of Uruguay.[2][3]
| Eopachyrucos | |
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| Mandible of Eopachyrucos pliciformis | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Infraclass: | Placentalia |
| Order: | †Notoungulata |
| Family: | †Interatheriidae |
| Subfamily: | †Interatheriinae |
| Genus: | †Eopachyrucos Ameghino 1901 |
| Type species | |
| †Eopachyrucos pliciformis Ameghino, 1901 | |
| Species | |
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| Synonyms | |
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Taxonomy
Eopachyrucos was first named in 1901 by Florentino Ameghino based on fragmentary remains found in the Sarmiento Formation of Argentina.[4] He originally considered it as a member of the family Hegetotheriidae, as an ancestor of Pachyrukhos, as reflected in its name ("dawn Pachyrukhos"), however, recent studies have confirmed it to be a member of the family Interatheriidae, more specifically within the subfamily Interatheriinae.
The following cladogram of the Interatheriinae is based on Vera et al. 2017, showing the position of Eopachyrucos.[5]
| Interatheriinae |
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