| Equinae | |
|---|---|
 | |
| Domestic horse (Equus caballus) (Equini) | |
 | |
| Skeleton of the three-toed equine †Hipparion (†Hipparionini) | |
Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Perissodactyla |
| Family: | Equidae |
| Subfamily: | Equinae Steinmann & Döderlein 1890 |
| Tribes | |
Equinae is asubfamily of thefamilyEquidae, known from theHemingfordian stage of theEarly Miocene (16 million years ago) onwards.[1][2] They originated in North America, before dispersing to every continent except Australia and Antarctica. They are thought to be amonophyletic grouping.[3] Members of the subfamily are referred to asequines;[4] the only extant equines are thehorses,asses, andzebras of the genusEquus, with two other generaHaringtonhippus andHippidion becoming extinct at the beginning of the Holocene, around 11–12,000 years ago.
The subfamily contains two tribes, theEquini and theHipparionini, as well as two unplaced genera,Merychippus andScaphohippus. Members of the family ancestrally had three toes, while members of the tribe Equini from the Middle Miocene onwards developed monodactyl feet.[5] They belong to the orderPerissodactyla, meaning they are odd-toed animals.
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