Eopachyrucos Explained

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]}

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]

Notes and References

1. Hitz . Ralph B. . Reguero . Marcelo . Wyss . André R. . Flynn . John J.. 2000 . New interatheriines (Interatheriidae, notoungulata) from the Paleogene of central Chile and southern Argentina . Fieldiana. 10.5962/bhl.title.5169. 42. 1–42. free. 11336/111062 . free .
2. Dozo . María Teresa . Ciancio . Martín . Bouza . Pablo José . Martínez . Gastón . 2014 . New association of Paleogene Mammals in Eastern of Patagonia (Chubut Province, Argentina): biochronological and paleobiogeographical implications. . . 41 . 1. 10.5027/andgeoV41n1-a09. free. 11336/27088 . free .
3. Reguero . Marcelo A. . Ubilla . Martín . Perea . Daniel . 2003-06-17 . https://doi.org/10.1671/0272-4634(2003)023[0445:ANSOEM2.0.CO;2 A new species of Eopachyrucos (Mammalia, Notoungulata, Interatheriidae) from the Late Oligocene of Uruguay ]. Journal of Vertebrate Paleontology . 23 . 2 . 445–457 . 10.1671/0272-4634(2003)023[0445:ANSOEM]2.0.CO;2 . 85678430 . 0272-4634.
4. Book: Ameghino, Florentino . Notices préliminaires sur des ongulés nouveaux des terrains crétacés de Patagonie . 1901.
5. Vera . Bárbara Soledad . Reguero . Marcelo Alfredo . Gonzalez . Laureano Raul . December 2017 . The Interatheriinae notoungulates from the middle Miocene Collón Curá Formation in Argentina . Acta Palaeontologica Polonica . 62 . 10.4202/app.00373.2017 . free . 11336/56874. free .