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''Bibimys'' is a genus of new world rats. Commonly known as the crimson-nosed rats, there are three species: *''Bibimys chacoensis'' - Chaco Crimson-nosed Rat - found in north-east Argentina and Paraguay *''Bibimys labiosus'' - Large-lipped Crimson-nosed Rat - south-east Brazil *''Bibimys torresi'' - Torres' Crimson-nosed Rat - central Argentina Presently, the distributional range of ''Bibimys'' covers Argentina, Brasil and Paraguay. As with most of the species in the South American sigmodontinae, ''Bibimys'' has been arranged as a genus based mainly on morphological differences with the other living genera. ''Bibimys'' belongs to the tribe Scapteromyini, first informally described by P. Hershkovitz in 1966 and formally introduced later by E. Massoia in 1979. The scapteromyines are a small sigmodotine tribe, consisting of the three genera: ''Bibimys'', ''Kunsia'' and ''Scapteromys''. Many of the species have been described from badly preserved specimens. One of the greatest challenges lying with sigmodontine systematics, is that there is much confusion and disagreement amongst authors regarding to the relationship between their tribes and their real identity is not clear. Therefore, there are some disagreement regarding even to the validity of the scapteromyines or eventually, even of ''Bibimys'' as a genus. In a recent broad phylogenetic study, Smith and Patton found that scapteromyine genera ''Kunsia'' and ''Scapteromys'' formed a clade closely related with the Akodontini. Further analysis of DNA sequences may shed new light regarding to ''Bibimys'' taxonomical position. Generic diagnosis emended, alpha taxonomy reviewed, and known fossil and recent occurrences consolidated by D’Elía et al. (in press). In a recent study, D´Elia, Pardiñas and Myers have provisionally retained three species of ''Bibimys'', given the inadequacies of sample size and geographic representation, however, they acknowledged that morphological, karyotypic, and genetic evidence for their separation is unpersuasive. ==References== * * * * Hershkovitz, P. "South American swamp and fossorial rats of the scapteromyine group (Cricetinae, Muridae) with comments to the glans penis in murid taxonomy. ''Zeitschrift fur Saugetierkunde'' 31: 81-149. (1966) Massoia, E. "Descripción de un género y especie nuevos: ''Bibimys torresi'' (Mammalia-Rodentia-Cricetidae-Sigmodontinae-Scapteromyni) ''Physis'', C38: 1-7 (1979) Smith, M.F. and J.L. Patton, "Phylogenetic relationship and the radiation of sigmodontinae rodents in South America: Evidence from cytochrome b. ''Journal of Mammalian Evolution'' 6: 89-128 (1999) 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「Bibimys」の詳細全文を読む スポンサード リンク
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