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How many living species of perissodactyls are there?

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There are 15 living species of perissodactyls, which are members of the order Perissodactyla. These extant species are categorized into three families:

Equidae (horses, asses, and zebras): 6 species1
Tapiridae (tapirs): 4 species1
Rhinocerotidae (rhinoceroses): 5 species1

These surviving groups represent only a small fraction of the order's historical diversity, as more than 200 fossil forms have been identified. Most of the currently living species are considered endangered.21