name = "Macrauchenia"
fossil_range = fossil range|7Late
Mioceneto Late Pleistocene
status = fossil
image_width = 250px
ordo = †
familia = †
genus = †"Macrauchenia"
subdivision_ranks = Species
subdivision = †"M. patagonica"
type_species = "Macrauchenia patagonica"
type_species_authority = Owen, 1838
"Macrauchenia" (literally "Big Neck") was a long-necked and long-limbed, three-toed
South American ungulate mammal, typifying the order Litopterna. The oldest fossils date back to around seven million years ago, and "M. patagonica" disappears from the fossil recordduring the late Pleistocene, around 10 thousand years ago. "M. patagonica" was the best known member of the family Macraucheniidae, and is known only from fossilfinds in South America, primarily from the Lujan Formation in Argentina. The original specimen was discovered by Charles Darwinduring the voyage of the "Beagle". In life, "Macrauchenia" resembled a humpless camel with a short trunk, though it is not closely related to either camelsor proboscideans.
"Macrauchenia" appeared in the
fossil recordsome 7 million years ago in South America (in the Mioceneepoch). It is likely that "Macrauchenia" arose from either " Theosodon" or " Promacrauchenia". Notoungulataand Litopternawere two ancient orders of ungulates which only occurred in South America. Many of these species became extinct through competition with invading North American ungulates during the Great American Interchange, after the establishment of the Central American land bridge. A few survivors of this invasion were the litopterns "Macrauchenia" and " Windhausenia" and the large notungulates " Toxodon" and " Mixotoxodon". These last original South American hoofed animals died out eventually at the end of the Pleistocene, along with numerous other large animals on the American continent (such as American elephants, horses, camels, saber-toothed cats and ground sloths). As this genus was the last of the litopterns, its extinction ended that line of mammals.
One striking characteristic of "Macrauchenia" is that, unlike most other mammals, the openings for nostrils on its skull were atop the head, leading some early scientists to believe that, much like a
whale, it used these nostrils as a form of snorkel. Soon after some more recent findings, this theory was rejected. One insight into "Macrauchenia"'s physiology is that it apparently had unusually good mobility, being able to rapidly change direction when it ran. It is speculated that since "Macrauchenia" lived in an environment much like the savannas of modern-day Africa, it may have had a tawny coat to match the color of dried grass.
"Macrauchenia" is known, like its relative, "
Theosodon", to have had a full set of 44 teeth.
Diet and behavior
"Macrauchenia" was an herbivore, likely living on leaves from trees or grasses. Scientists believe that, because of the forms of its teeth, it ate using its trunk to grasp leaves and other food. It is also believed that it lived in herds like modern-day
wildebeestor antelope, the better to escape predators.
When "Macrauchenia" first arose, it would have been preyed upon by the largest of native South American predators,
terror birds such as " Andalgalornis", and carnivorous marsupials such as " Thylacosmilus" and " Borhyaena". During the late Pliocene/Early Pleistocene, the Panama Isthmusformed, allowing predators of North American origin, such as the puma, the jaguarand the saber-toothed cat, " Smilodon populator", to emigrate into South America and replace the native forms.
It is presumed that "Macrauchenia" dealt with its predators primarily by outrunning them, or, failing that, kicking them with its long, powerful legs, much like modern-day
vicuñaor camelsFact|date=April 2008.
"Macrauchenia" was first discovered at the beginning of the nineteenth century in
Patagonia(Argentina) by Charles Darwin, during his voyage aboard the HMS Beagle. He mistakenly identified it as a giant llama. Since then, more "Macrauchenia" fossils have been found, mainly in Patagonia, but also in Boliviaand Venezuela.
"Macrauchenia" is featured in the episode "Saber-tooth" of the show "
Walking with Beasts", and indviduals are featured in the 2002 Blue Sky film Ice Age and its sequel, the 2006 film . It was included in the as part of the Dinosaur Digs Theme Pack and in as a cloneable beast.
*Barry Cox, Colin Harrison, R.J.G. Savage, and Brian Gardiner. (1999): The Simon & Schuster Encyclopedia of Dinosaurs and Prehistoric Creatures: A Visual Who's Who of Prehistoric Life.
Simon & Schuster.
*Jayne Parsons. (2001): Dinosaur Encyclopedia. DK.
*Haines, Tim & Chambers, Paul. (2006):
The Complete Guide to Prehistoric Life. Canada: Firefly Books Ltd.
* [http://www.rau.edu.uy/uruguay/iconos/macrauke-.gifAn artist's rendition] of a Macrauchenia. Retrieved from the
Red Académica Uruguaya[http://www.rau.edu.uy/uruguay/historia/megafauna.htm megafauna page] .
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