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Mesaxonia is now considered a synonym of Perissodactyla, but it was sometimes also used for the true odd-toed ungulates as a subcategory (rhinos, horses, tapirs), while Perissodactyla stood for the entire order, including the hyrax. The assumption that hyraxes were Perissodactyla was held well into the 20th century. [73]
Perissodactyla is an order of placental mammals composed of odd-toed ungulates – hooved animals which bear weight on one or three of their five toes with the other toes either present, absent, vestigial, or pointing backwards. Members of this order are called perissodactyls, and include rhinoceroses, tapirs, and horses.
Equidae (commonly known as the horse family) is the taxonomic family of horses and related animals, including the extant horses, asses, and zebras, and many other species known only from fossils. The family evolved more than 50 million years ago, in the Eocene epoch, from a small, multi-toed ungulate into larger, single-toed animals.
The horse belongs to the order Perissodactyla (odd-toed ungulates), the members of which all share hooved feet and an odd number of toes on each foot, as well as mobile upper lips and a similar tooth structure. This means that horses share a common ancestry with tapirs and rhinoceroses.
Brontotheriidae is a family of extinct mammals belonging to the order Perissodactyla, the order that includes horses, rhinoceroses, and tapirs.Superficially, they looked rather like rhinos with some developing bony nose horns, and were some of the earliest mammals to have evolved large body sizes of several tonnes.
Equoidea is a superfamily of hippomorph perissodactyls containing the Equidae, Palaeotheriidae, and other basal equoids of unclear affinities, of which members of the genus Equus are the only extant species.
Odd-toed ungulates (Perissodactyla) Primates (Primates) Key. Conservation status ... Horse: Equus ferus caballus: 58,000,000 [18] Domesticated: See also. Biology portal;
Nannippus is an extinct genus of three-toed horse endemic to North America during the Miocene through Pleistocene, about 13.3—1.8 million years ago (Mya), living around 11.5 million years. [ 1 ] [ 2 ] [ 3 ] This ancient species of three-toed horse grew up to 3.5 feet (1.1 meters) and weighed between 165 pounds to 199 pounds, which was around ...