| Pseudhyrax | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | † Notoungulata |
| Family: | † Archaeohyracidae |
| Genus: | † Pseudhyrax Ameghino, 1901 |
| Type species | |
| †Pseudhyrax eutrachytheroides Ameghino, 1901 | |
| Species | |
| |
| Synonyms | |
| |
Pseudhyrax is an extinct genus of archaeohyracid notoungulate. It lived from the Late Eocene to the Early Oligocene, of what is now South America.
This animal was approximately the size of a modern raccoon, and its skull was approximately 13 centimeters long. The length of its body, excluding the tail, was approximately 65–75 centimeters, and it weighed around 7–9 kilograms. Pseudhyrax had a low and elongated skull, mainly characterized by its dentition. The premolars and molars of Pseudhyrax were particularly high-crowned (hypsodont).
The genus Pseudhyrax was first described in 1901 by Florentino Ameghino, based on fossil remains found in Argentina in terrains dated from the Late Eocene. The type species is Pseudhyrax eutrachytheroides, and the species P. strangulatus was also named by Ameghino. The name Pseudhyrax ("false hyrax") reflects Ameghino's belief that this animal was related to hyraxes, due to the shape of its skull. The species name of the type species, eutrachytheroides, means "similar to Eutrachytherus", another genus of notoungulate currently considered as a synonym of Trachytherus .
Pseudhyrax is traditionally considered a member of Archaeohyracidae, a clade of Notoungulates sharing similarities with the modern rock hyrax, but larger in size and with hypsodont teeth. The family Archaeohyracidae, however, may be paraphyletic, and some of its members may be basal to other groups of Typotheres.
Pseudhyrax was a terrestrial animal, probably fast and agile, and perhaps social. It was herbivorous and its high-crowned premolars and molars indicates that it was able to feed on hard and abrasive plants in open areas.
Interatherium is an extinct genus of interatheriid notoungulate from the Early to Middle Miocene (Colhuehuapian-Mayoan). Fossils have been found in the Santa Cruz, Collón Curá and Sarmiento Formations in Argentina.
Ernestokokenia is an extinct genus of mammal, belonging to the Didolodontidae. It lived during the Early Eocene and the Middle Eocene, and its fossils were discovered in South America.
Otrhonia is an extinct genus of notoungulate, belonging to the Notostylopidae family. It lived during the Late Eocene, and its remains were discovered in South America.
Henricosbornia is an extinct genus of henricosborniid notoungulate that lived from the Late Paleocene to the Middle Eocene of what is now Argentina and Brazil.
Eohyrax is an extinct genus of Notoungulate, belonging to the suborder Typotheria. It lived during the Middle Eocene, and its remains were discovered in South America.
Transpithecus is an extinct genus of Notoungulates, belonging to the suborder Typotheria. It lived during the Middle Eocene in what is today South America.
Argyrohippus is an extinct genus of notoungulate, belonging to the family Notohippidae. It lived from the Late Oligocene to the Early Miocene, and its fossilized remains were found in South America.
Periphragnis is an extinct genus of isotemnid notoungulates that lived from the Middle Eocene to the Early Oligocene in what is now Argentina and Chile.
Pleurostylodon is an extinct genus of notoungulate belonging to the family Isotemnidae. It lived during the Middle Eocene, in what is now Argentina.
Eomorphippus is an extinct genus of notohippid notoungulate that lived from the Late Eocene to the Early Oligocene in what is today South America.
Eurygenium is an extinct genus of notoungulate belonging to the family Notohippidae. It lived during the Late Oligocene in what is today South America.
Morphippus is an extinct genus of notohippid notoungulate that lived during the Middle to Late Oligocene in what is now South America.
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.
Archaeopithecus is an extinct genus of Notoungulate, belonging to the suborder Typotheria. It lived during the Middle Eocene, in what is today Argentina.
Teratopithecus is an extinct genus of archaeopithecid notoungulate that lived during the Middle Eocene of what is now Argentina. Fossils of this genus have been found in the Sarmiento Formation of Argentina.
Oldfieldthomasia is an extinct genus of Notoungulate, probably related to the suborder Typotheria. It lived during the Middle Eocene, in what is today South America.
Ultrapithecus is an extinct genus of oldfieldthomasiid notoungulate that lived during the Middle Eocene of what is now Argentina.
Argyrohyrax is an extinct genus of interatheriid notoungulate that lived during the Late Oligocene, of what is now Argentina and Bolivia.
Santiagorothia is an extinct genus of interatheriid notoungulate. It lived during the Early Oligocene, and its fossils were discovered in Argentina and Chile.
Notopithecus is an extinct genus of Notoungulate, belonging to the suborder Typotheria. It lived from the Middle to the Late Eocene and its fossilized remains were discovered in South America.
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