Eopachyrucos

Eopachyrucos Temporal range: Middle Eocene-Late Oligocene (Mustersan-Deseadan) ~48–23.0  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Mandible of Eopachyrucos pliciformis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	† Notoungulata
Family:	† Interatheriidae
Subfamily:	† Interatheriinae
Genus:	† Eopachyrucos Ameghino 1901
Type species
†Eopachyrucos pliciformis Ameghino, 1901
Species
E. pliciferusAmeghino 1901 E. pliciformisAmeghino 1894 E. ranchoverdensisReguero et al. 2003
Synonyms
EupachyrucosAmeghino 1906

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]

Interatheriinae

Eopachyrucos pliciferus Santiagorothia chiliensis Federicoanaya sallaensis Brucemacfaddenia boliviensis Archaeophylus patrius Progaleopithecus tournoueri Argyrohyrax proavus Interatherium robustum Cochilius volvens Protypotherium australe Protypotherium endiadys Protypotherium distinctum Protypotherium sinclairi Miocochilius federicoi Miocochilius anamopodus Protypotherium minutum Protypotherium colloncurensis

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 . 42: 1–42. doi: 10.5962/bhl.title.5169 . hdl: 11336/111062 .
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". Andean Geology . 41 (1). doi: 10.5027/andgeoV41n1-a09 . hdl: 11336/27088 .
3. Reguero, Marcelo A.; Ubilla, Martín; Perea, Daniel (2003-06-17). "A new species of Eopachyrucos (Mammalia, Notoungulata, Interatheriidae) from the Late Oligocene of Uruguay". Journal of Vertebrate Paleontology. 23 (2): 445–457. doi:10.1671/0272-4634(2003)023[0445:ANSOEM]2.0.CO;2. ISSN   0272-4634. S2CID   85678430.
4. Ameghino, Florentino (1901). Notices préliminaires sur des ongulés nouveaux des terrains crétacés de Patagonie.
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. doi: 10.4202/app.00373.2017 . hdl: 11336/56874 .