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A new species of Mustela, subgenus Grammogale, is described. It is characterized by dark, uniform dorsal coloration, reduced anterior premolars, and a wide mesopterygoid fossa. a range extension is recorded for Mustela africana, and an overall evolutionary scheme for the three Neotropical species of Mustela is proposed.
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R. J. Izor (1978) studied this question.
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