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The white rhinoceros is the largest living perissodactyl. Perissodactyla (/ p ə ˌ r ɪ s oʊ ˈ d æ k t ɪ l ə /, from Ancient Greek περισσός, perissós 'odd' and δάκτυλος, dáktylos 'finger, toe' [3]), or odd-toed ungulates, is an order of ungulates.
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.
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Panperissodactyla ("all perissodactyls", alternatively spelled Pan-Perissodactyla [2]) is a clade of ungulates containing living order Perissodactyla (odd-toed ungulates) and all extinct ungulates more closely related to Perissodactyla than to Artiodactyla (even-toed ungulates).
Rhinocerotoidea is a superfamily of perissodactyls that appeared 56 million years ago in the Paleocene.They included four extinct families, the Amynodontidae, the Hyracodontidae, the Paraceratheriidae, and the Eggysodontidae.
Molecular sequence data from both collagen [7] [8] and mitochondrial DNA [9] supports that litopterns and notoungulates are most closely related to Perissodactyla (the group containing equids, rhinoceroses, and tapirs) among living mammals, as part of the clade Panperissodactyla, making them true ungulates, which has also been supported by some ...
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Isectolophidae is an extinct family of browsing, herbivorous, mammals in the order Perissodactyla. [1] It forms a sister group to the rest of the Tapiromorpha , which includes the Ancylopoda (lophiodontids and Chalicotherioidea) and the Ceratomorpha (tapirs, rhinoceroses and their extinct relatives).