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Octodontidae is a family of rodents, restricted to southwestern South America. Thirteen species of octodontid are recognised, arranged in nine genera. The best known species is the degu, ''Octodon degus''. Octodontids are medium-sized rodents, ranging from in body length. They have long, silky, fur, which is typically brownish in color, and often paler on the underside. The name 'octodont' derives from the wear pattern of their teeth, which resembles a figure 8. Most are nocturnal, social, burrowing animals, though the degu is largely diurnal. They are herbivorous, eating tubers, bulbs, and cactuses. Some authors have suggested that the octodontids should be reclassified in the order Lagomorpha, but this has not been supported by further analyses (e.g. Opazo, 2005). Older literature includes the tuco-tucos in the family, as the subfamily Ctenomyinae, but these animals are normally now treated as a separate family, Ctenomyidae. Two of the genera now included in this family, ''Salinoctomys'' and ''Pipanacoctomys'', have only recently been described. There is some evidence that evolution within the family may have resulted from polyploidy. The red viscacha rat, ''Tympanoctomys barrerae'', is tetraploid, with 102 chromosomes, and the recently described golden viscacha rat ''Pipanacoctomys aureus'' has 92. Members of the genus ''Aconaemys'' are referred to as rock rats, and members of genus ''Octodon'' are all called degus, though the name degu on its own implies ''O. degu''. The single member of ''Spalacopus'', ''S. cyanus'', is called the coruro. Members of the other genera are called viscacha rats: note, however, that viscachas are not octodontids - they are members of the chinchilla family Chinchillidae. ==List of species== Genus ''Aconaemys'' Ameghino, 1891 (Andean rock rats). *Species ''Aconaemys fuscus'' (Waterhouse, 1842) (Chilean rock rat). Andes of Chile and Argentina. *Species ''Aconaemys porteri'' Thomas, 1917. (Porter's rock rat) Andes of Chile and Argentina. *Species ''Aconaemys sagei'' (Pearson, 1984) (Sage's rock rat). Andes of Chile and Argentina. Genus ''Octodon'' Bennett, 1832 (Degus). *Species ''Octodon bridgesi'' Waterhouse, 1844 (Bridges' degu). Andes of Chile and Argentina. *Species ''Octodon degus'' (Molina, 1782) (Degu). Western Chile. *Species ''Octodon lunatus'' Osgood, 1943 (Moon-toothed degu). Western Chile. *Species ''Octodon pacificus'' Hutterer, 1994 (Isla Mocha degu). Isla Mocha, off western Chile. Genus ''Octodontomys'' Palmer, 1903. *Species ''Octodontomys gliroides'' Gervais & D'Orbigny, 1844. (Mountain degu) Andes of northwestern Argentina, extreme northeastern Chile and western Bolivia. Genus ''Octomys'' Thomas, 1920. *Species ''Octomys mimax'' Thomas, 1920 (Mountain viscacha rat). Andes of Argentina. Genus ''Pipanacoctomys'' Mares et al., 2000. *Species ''P. aureus'' Mares et al., 2000 (Golden viscacha rat). Catamarca Prov., Argentina. Genus ''Salinoctomys'' Mares et al., 2000. *Species ''Salinoctomys loschalchalerosorum'' Mares et al., 2000 (Chalchalero viscacha rat). La Rioja Prov., Argentina. Genus ''Spalacopus'' Wagler, 1832. *Species ''Spalacopus cyanus'' (Molina, 1782) (Coruro). Western Chile. Genus ''Tympanoctomys'' Yepes, 1942. *Species ''Tympanoctomys barrerae'' (Lawrence, 1941) (Plains Viscacha Rat or Red viscacha rat). Scattered localities in western Argentina. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Octodontidae」の詳細全文を読む スポンサード リンク
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