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The largest odd-toed ungulates are rhinoceroses, and the extinct Paraceratherium, a hornless rhino from the Oligocene, is considered one of the largest land mammals of all time. At the other extreme, an early member of the order, the prehistoric horse Eohippus, had a withers height of only 30 to 60 cm (12 to 24 in).
- Odd-toed ungulate
Odd-toed ungulates are the Perissodactyla, an order of...
- Odd-toed Ungulates Perissodactyla
This is a list of odd-toed ungulate species by estimated...
- Ungulate
The two extant orders of ungulates are the Perissodactyla...
- Odd-toed ungulate
Odd-toed ungulate is the common name for any of the hoofed, herbivorous, terrestrial mammals comprising the order Perissodactyla, characterized by a pulley-like groove in the proximal surface of the astragalus (a bone in the ankle joint) and an odd number of functional toes (one or three), with the axis of each limb going through the enlarged ...
- Mammalia
- Animalia
- Eutheria
- Chordata
The name—from Greek perissos, “odd,” and daktylos, “finger”—was introduced to separate the odd-toed ungulates from the even-toed ones ( Artiodactyla ), all of which had previously been classified as members of a single group. General features.
The name Perissodactyla means "odd-toed." This group of ungulates includes horses, tapirs, and rhinos. The name of their order derives from the fact that their middle toe is larger than the others, and the plane of symmetry of the foot passes through it, a condition called mesaxonic.
