Molecular Biology and Genetics
Statistics of barcoding coverage
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The family Chinchillidae is in the order Rodentia and consists of the chinchillas, the viscachas, and their fossil relatives. This family is restricted to southern and western South America, mostly living in mountainous regions of the Andes but one species living on plains. They are medium to large-sized rodents, weighing from 800 g (28 oz) to 8 kg (18 lb), with strong hind legs and large ears and a bushy tail. All species have thick, soft fur, which is considered valuable in some cultures.
Members of the family Chinchillidae are somewhat squirrel-like rodents varying in weight from 0.5 to 8 kilograms (1.1 to 18 lb). They have large eyes, medium-sized ears, soft dense fur and short bushy tails. The forelegs are shorter than the hind legs. The forefeet have four toes while the hind feet have four small-clawed toes in Lagidium and Chinchilla but three large-clawed toes in Lagostomus, a digging species. Their dental formula is 1/1, 0/0, 1/1, 3/3 and their incisors grow continually throughout their lives. Chinchillids are generally brownish-grey or grey on the dorsal (upper) surface and pale on the ventral (under) surface. Plains viscachas have distinctive black and white markings on their faces.
The Chinchillidae are native to South America. Chinchillas and mountain viscachas live in remote mountainous regions of Chile and Peru, on rocky surfaces and among boulders. Plains viscachas are found in the plains of Argentina, from the Gran Chaco area southwards to Patagonia.
Members of this family are herbivorous and live in colonies of up to several hundred individuals. Plains viscachas live in extensive networks of burrows on plains where it is said that ten viscachas can eat as much as does one sheep. Mountain viscachas and chinchillas live in craggy upland regions where they inhabit crevices among rocks and are skilled climbers. Although they can jump, they mostly move about by walking or running. They use vocalizations to communicate with each other, especially the plains viscachas.
Both species of chinchillas are listed by the IUCN as being "Critically endangered" and may be extinct in the wild. They were at one time relatively common but have been overexploited by hunters catching them for the fur trade. The plains viscacha is rated as being of "Least Concern" as it seems tolerant of habitat disturbance and although some populations have been eliminated locally through pest control measures and hunting, others have expanded into newly cleared areas. Both the northern and southern mountain viscachas are also considered of "Least Concern" as they have a wide range and are locally abundant in some areas.
There are three extant and three fossil genera currently recognized.
- †Eoviscaccia incertae sedis
- Subfamily Chinchillinae
- Subfamily Lagostominae
- Woods, C. A. and Kilpatrick, C. W. 2005. Infraorder Hystricognathi. In: D. E. Wilson and D. M. Reeder (eds), Mammal Species of the World, pp. 1538-1599. The Johns Hopkins University Press, Baltimore, MD, USA.
- Bishop, Ian (1984). Macdonald, D., ed. The Encyclopedia of Mammals. New York: Facts on File. p. 702. ISBN 0-87196-871-1.
- Myers, Phil (2002). "Chinchillidae: chinchillas and viscachas". Animal Diversity Web. University of Michigan. Retrieved 2013-10-02.
- D'elia, G.; Orjeda, R. (2008-06-30). "Chinchilla chinchilla". IUCN Red List of Threatened Species. Retrieved 2013-10-02.
- D'elia, G.; Teta, P. (2008-06-30). "Chinchilla lanigera". IUCN Red List of Threatened Species. Retrieved 2013-10-02.
- Lessa, E.; Ojeda, R.; Bidau, C. (2008-06-30). "Lagostomus maximus". IUCN Red List of Threatened Species. Retrieved 2013-10-04.
- Pacheco, V.; Zeballos, H.; Vivar E.; Bernal, N. (2008-06-30). "Lagidium peruanium". IUCN Red List of Threatened Species. Retrieved 2013-10-04.
- Dunnum, J.; Vargas, J.; Bernal, N.; Zeballos, H.; Lessa, E.; Ojeda, R.; Bidau, C. (2008-06-30). "Lagidium viscacia". IUCN Red List of Threatened Species. Retrieved 2013-10-04.
- McKenna, Malcolm C., and Bell, Susan K. 1997. Classification of Mammals Above the Species Level. Columbia University Press, New York, 631 pp. ISBN 0-231-11013-8
Viscachas or vizcachas are rodents of two genera (Lagidium and Lagostomus) in the family Chinchillidae. They are closely related to chinchillas, and look similar to rabbits, apart from their longer tails. The five extant species of viscacha are:
- The plains viscacha (Lagostomus maximus), a resident of the pampas of Argentina, is easily differentiated from other viscachas by black and gray mustache-like facial markings. This species lives colonially in warrens of 10 to over 100. It is very vocal and emits alarm calls. The plains viscacha can strip grassland used to graze livestock; this caused ranchers to consider the rodent a pest species.
- Lagidium ahuacaense is a newly described species of mountain viscacha from the Ecuadorean Andes.
- The northern viscacha (Lagidium peruanum) is native to the Peruvian Andes at elevations between the tree line and the snow line. It is dorsally gray or brown in color, with a bushy tail and long, furry ears. This species lives in large colonies separated into individual family units, like an apartment complex. It eats a wide range of plant matter, settling for almost anything it can find growing in the harsh, rocky environment.
- The southern viscacha (Lagidium viscacia), also called mountain viscacha, is similar to the northern viscacha, but its pelage is more red in color. It lives in similar habitat in the Andes.
- Wolffsohn's viscacha (Lagidium wolffsohni) is rarer than the other four viscachas.
References[edit source | edit]
- Ledesma, K. J.; Werner, F. A.; Spotorno, A. E.; Albuja, L. H. (2009). "A new species of Mountain Viscacha (Chinchillidae: Lagidium Meyen) from the Ecuadorean Andes" (pdf). Zootaxa 2126: 41–57.
- Werner, F. A.; Ledesma, K. J.; R. Hidalgo B. (2006). "Mountain vizcacha (Lagidium cf. peruanum) in Ecuador - First record of Chinchillidae from the Northern Andes" (pdf). Mastozoología Neotropical 13 (2): 271–274.