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Ctenomys lami, a new species from southern Brazil, is described and compared with a closely related species, C. minutus Nehring 1887. Cytogenetic analysis and morphological characters confirm the new taxon. Evidences suggest that C. minutus is derived from C. lami by a speciation process based on chromosome differences.
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Thales Renato Ochotorena de Freitas (2001) studied this question.
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