Machaeroides
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Machaeroides Temporal range: Eocene |
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| Machaeroides eothen skull | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Creodonta |
| Family: | †Oxyaenidae |
| Subfamily: | †Machaeroidinae |
| Genus: | †Machaeroides |
| Type species | |
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Machaeroides eothen Matthew, 1909 |
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| Species | |
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Machaeroides ("dagger-like") is a genus of sabre-toothed predatory mammal that lived during the Eocene (56 to 34 mya). Its fossils were found in the U.S. state of Wyoming.
Either species bore a passing, or superficial resemblance to a very small, dog-sized saber-toothed cat. Machaeroides could be distinguished from actual saber-toothed cats by their more-elongated skulls, and their plantigrade stance. Machaeroides species are distinguished from the closely related Apataelurus by the fact that the former genus had smaller saber-teeth. Despite its small size, the genus Machairoides was well-equipped to hunt prey larger than itself, such as the small, primitive horses and rhinoceroses present at the time, as it was equipped with saber teeth and powerful forelimbs to subdue prey.
M. eothen weighed an estimated 10–14 kg, thus matching in size a small Staffordshire Terrier. M. simpsoni was probably smaller. (Egi 2001)
Its position within the mammals has been in dispute. Experts have been equally divided over whether Machaeroides and its sister-genus, Apataelurus, belong in Oxyaenidae or Hyaenodontidae, though the most recent studies favor the former.
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