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Eohippus is the earliest horse. It is a member of the extinct genus Hyracotherium. It is a terrier-sized herbivore having four hoofed toes on each forefoot and three on each hind foot and a low-crowned teeth.
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Mesohippus is a genus of extinct small three-toed horses known from fossils found on Oligocene deposits in North America.
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Merychippus is a primitive stage in the evolution of the horses that existed in the Miocene era.
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Pliohippus is a genus of horses having a single toe on each foot. It is known from North America and fossils still remain in the Pliocence epoch.
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Equus is horse now. Equus is a hoofed herbivorous mammal of the family Equidae. It compromises a single species whose numerous varieties are called breeds. Horseback riding was one of the chief means of transportation.
