Artiodactyl
The Artiodactyla are even-toed ungulates, an order of mammals. They have an even number of toes: two or four. For example, camelids or animals of the Giraffidae family have two toes, but hippopotami have four toes.
| Artiodactyla | |
|---|---|
| |
| Pronghorn (Antilocapra americana) | |
Scientific classification 
| |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Ungulata |
| Order: | Artiodactyla Owen, 1848 |
| Suborders | |
Whales are ocean creatures without toes, but are classified in the related super-order Cetartiodactyla because their ancestors were even toed ungulates.
Digestion
Some artiodactyls are ruminants (Ruminantia and Tylopoda). They ruminate their food—they regurgitate and re-chew it. This is a very important evolutionary advance. Their stomachs are divided into three to four sections.[2]
After eating, the food re-enters the mouth, where it is chewed again. The food passes to the "fermentation chamber" (rumen and reticulum), where microbes (bacteria, protozoa, and fungi) help to break down the cellulose found in plant material.[2]
This form of digestion has two advantages: ruminants can digest plants that are indigestible to other species, and they can take less time in eating. The animal spends only a short time out in the open with his head to the ground—rumination can happen later, in a sheltered area.[3]
Taxonomy
- Order Artiodactyla
- Suborder Suina
- Family Suidae
- Family Tayassuidae
- Family Hippopotamidae
- Subfamily †Maiaboarinae
- Suborder Tylopoda
- Family Camelidae
- Suborder Ruminantia
- Family Tragulidae
- Family Moschidae
- Family Cervidae
- Family Giraffidae
- Family Antilocapridae
- Family Bovidae
- Suborder Suina
Artiodactyl Media
Entelodonts were stocky animals with a large head, and were characterized by bony bumps on the lower jaw.
Sivatherium was a relative of giraffes with deer-like forehead weapons.
Richard Owen coined the term "even-toed ungulate".
Molecular and morphological studies confirmed that cetaceans are the closest living relatives of hippopotamuses.
Hippos are a geologically young group, which raises questions about their origin.
Recherches pour servir à l'histoire naturelle des mammifères (Pl. 80) (white background)
Voyage en Abyssinie Plate 2 (white background)
Cladogram of Cetacea within Artiodactyla (Camelus bactrianus)
Tragulus napu - 1818-1842 - Print - Iconographia Zoologica - Special Collections University of Amsterdam - (white background)
Walia ibex illustration white background
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Related pages
References
- ↑ Lucas, Spencer G.; Zeigler, Kate E.; Kondrashov, Peter E. (2004-01-01). Paleogene Mammals: Bulletin 26. New Mexico Museum of Natural History and Science. p. 205.
- ↑ 2.0 2.1 Janis, C.; Jarman, P. (1984). Macdonald, D. (ed.). The Encyclopedia of Mammals. New York: Facts on File. pp. 498–499. ISBN 978-0-87196-871-5.
- ↑ Shively, C. L.; et al. (1985). "Some aspects of the nutritional biology of the collared peccary". The Journal of Wildlife Management. 49 (3): 729–732. doi:10.2307/3801702. JSTOR 3801702.
Other websites
Data related to Artiodactyla at Wikispecies
Media related to Artiodactyla at Wikimedia Commons