The three surviving families of odd-toed ungulate are classified as follows:* Order Perissodactyla** Suborder Hippomorpha*** Family Equidae: horses and allies, seven species in one genus**** "Equus ferus"***** Tarpan †, "Equus ferus ferus"***** Przewalski's horse, "Equus ferus przewalskii"***** Domestic horse, "Equus ferus caballus"**** African wild ass "Equus africanus"***** Domesticated ass (donkey) "Equus africanus asinus"**** Onager or Asiatic ass, "Equus hemionus"**** Kiang or Tibetan wild ass, "Equus kiang"**** Plains zebra, "Equus quagga"***** Quagga, †"Equus quagga quagga"***** Burchell's zebra, "Equus quagga burchellii"***** Grant's zebra, "Equus quagga boehmi"***** Maneless zebra "Equus quagga borensis"***** Chapman's zebra, "Equus quagga chapmani"***** Crawshay's zebra, "Equus quagga crawshayi"***** Selous' zebra, "Equus quagga selousi"**** Mountain zebra, "Equus zebra"***** Cape mountain zebra, "Equus zebra zebra"***** Hartmann's mountain zebra, "Equus zebra hartmannae"**** Grevy's zebra, "Equus grevyi"** Suborder Ceratomorpha*** Family Tapiridae: tapirs, five species in one genus**** Brazilian tapir, "Tapirus terrestris"**** Mountain tapir, "Tapirus pinchaque"**** Baird's tapir, "Tapirus bairdii"**** Malayan tapir, "Tapirus indicus"**** Kabomani tapir, "Tapirus kabomani"*** Family Rhinocerotidae: rhinoceroses, five species in four genera**** Black rhinoceros, "Diceros bicornis"**** White rhinoceros, "Ceratotherium simum"**** Indian rhinoceros, "Rhinoceros unicornis"**** Javan rhinoceros, "Rhinoceros sondaicus"**** Sumatran rhinoceros, "Dicerorhinus sumatrensis"Based on morphology, odd-toed ungulates were long thought to form a clade with even-toed ungulates.
** زیرراسته Hippomorpha**** اسب وحشی، "Equus ferus"***** اسب شوالسکی، "Equus ferus przewalskii"***** اسب اهلی، "Equus ferus caballus"**** خر وحشی آفریقایی "Equus africanus"***** خر اهلی "Equus africanus asinus"**** گورخر ایرانی یا خر آسیایی، "Equus hemionus"**** خر وحشی تبتی یا "کیانگ"، "Equus kiang"**** گورخر معمولی، "Equus quagga"**** گورخر کوهی، "Equus zebra"***** گورخر کوهی دماغه، "Equus zebra zebra"***** گورخر کوهی هارتمان، "Equus zebra hartmannae"**** گورخر گروی، "Equus grevyi"** زیرراسته Ceratomorpha**** تپیر برزیلی، "Tapirus terrestris"**** تپیر کوهی، "Tapirus pinchaque"**** تپیر بیرد، "Tapirus bairdii"**** تپیر مالایی، "Tapirus indicus"**** کرگدن سیاه، "Diceros bicornis"**** کرگدن سفید، "Ceratotherium simum"**** کرگدن هندی، "Rhinoceros unicornis"**** کرگدن جاوه، "Rhinoceros sondaicus"**** کرگدن سوماترا، "Dicerorhinus sumatrensis"* جفت‌سم‌سانان