We reviewed the alpha taxonomy of the genus Ctenomys Blainville, 1826 in southernmost South America, with emphasis on those nominal forms previously associated with C. magellanicus Bennett, 1836. We integrate distinct lines of evidence, including variation of mtDNA sequences, and the assessment of quantitative and qualitative traits of skins and skulls; when available, karyotypic data was also considered. Phylogenetic analysis of molecular markers shows low levels of divergence among specimens from southern South American mainland and the island of Tierra del Fuego (ca. 0.4%). This evidence plus the results of the multivariate analysis of metric data suggest that the nominal forms C. colburni J. A. Allen, 1903, C. fueginus Philippi, 1880, C. osgoodi J. A. Allen, 1905, C. m. dicki Osgood, 1943, and C. m. obscurus Texera, 1975 are subjective junior synonyms of C. magellanicus. In addition, we reviewed the status of C. fodax Thomas, 1910, a nominal form that have been alternatively considered as a valid species or related to C. magellanicus by previous researchers. Based on quantitative and qualitative morphological traits, we preliminarily regard C. fodax at the species level while citing it for the first time to Chile.

中文翻译：

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世界上最南端的象形纪元的综合分类法：区分与麦哲伦贝纳特（Ctenomys magellanicus Bennett）有关的名义形式，1836年（啮齿类，Hystricomorpha，Ctenomyidae）

我们回顾了1826年南美洲最南端的布莱恩维尔（Ctenomys Blainville）属的alpha分类学，着重介绍了以前与麦哲伦·贝内特（C. magellanicus Bennett）1836年相关的那些名义形式。皮肤和头骨的数量和质量特征；如果可以的话，还考虑了核型数据。分子标记的系统发育分析表明，南美南部大陆和火地岛之间的标本差异很小（约占0.4％）。该证据加上度量数据的多变量分析结果表明，名义形式C. colburni JA Allen，1903年，C。fueginusPhilippi，1880，C. osgoodi JA Allen，1905，C. m。迪基·奥斯古德（Dicki Osgood），1943年和C. m。1975年的obscurus Texra是magellanicus的主观初级同义词。此外，我们回顾了1910年f.fax托马斯（Thomas C. fodax Thomas）的状态，这是一种名义形式，以前的研究人员已将其认作有效物种或与麦哲伦（C. magellanicus）相关。基于定量和定性的形态特征，我们初步认为Ç。在物种一级的fodax，同时首次将其引用到智利。