Plains Viscacha Rat

Taxobox
name = Plains Viscacha Rat


status = VU
status_system = iucn2.3
regnum = Animalia
phylum = Chordata
classis = Mammalia
ordo = Rodentia
familia = Octodontidae
genus = "Tympanoctomys"
species = "T. barrerae"
binomial = "Tympanoctomys barrerae"
binomial_authority = (Lawrence, 1941)
synonyms = The Plains Viscacha Rat or Red Vizcacha Rat ("Tympanoctomys barrerae") is a species of rodent in the Octodontidae family. It is monotypic within the genus "Tympanoctomys". It is endemic to Argentina. Its natural habitat is subtropical or tropical dry lowland grassland. This species of rodent is unusual because it is tetraploid. Scientists think that this species may have arisen when an ancestor (very possibly the Mountain Vizcacha Rat, "Octomys mimax", chromosome count 2N=56) doubled its chromosome number, presumably by errors in mitosis or meiosis within the animal's reproductive organs. [Citation
last = Gallardoa
first = M.H.
publication-date = August 2006
title = Molecular cytogenetics and allotetraploidy in the red vizcacha rat, "Tympanoctomys barrerae" (Rodentia, Octodontidae)
periodical = Genomics
volume = 88
issue = 2
pages = 214-221
url = http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WG1-4JKYTJP-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a18e9e7ecd4f6082c8579d751043661d
doi = 10.1016/j.ygeno.2006.02.010
accessdate = 2008-07-16] Research has found another closely related species "Pipanacoctomys aureus" which is also tetraploid.

ources

*Contreras, L. 1996. [http://www.iucnredlist.org/search/details.php/22586/all Tympanoctomys barrerae] . [http://www.iucnredlist.org 2006 IUCN Red List of Threatened Species. ] Downloaded on 30 July 2007. AP Edition Biology 7th Edition Campbell Reece.
*Gallardo, M.H. "et al". (2004). Whole-genome duplications in South American desert rodents (Octodontidae). "Biological Journal of the Linnean Society, 82", 443-451.
*Gallardo. 2006. [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WG1-4JKYTJP-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a18e9e7ecd4f6082c8579d751043661d Molecular cytogenetics and allotetraploidy in the red vizcacha rat, "Tympanoctomys barrerae" (Rodentia, Octodontidae)] "Genomics". 88:2, 214-221. doi:10.1016/j.ygeno.2006.02.010
*Mares, Braun, Barquez, and Díaz. 2000. Two new genera and species of halophytic desert mammals from isolated salt flats in Argentina. Occasional Papers, Museum of Texas Tech University 203:i+1-27.
*Wilson, D.E., and D.M. Reeder (Eds.). 2005. Mammal Species of the World, Third Edition. Johns Hopkins University Press, Baltimore, MD. 2 Volumes, 2141 pp.

References