The single species, G. garleppi, is known from five specimens collected at altitudes of 3,800-4,500 meters on the Altiplano of southern Peru, western Bolivia, and northeastern Chile. Head and body lengths of two specimens are 105 and 123 mm, and corresponding tail lengths are 38 and 45 mm. The body is stout, the tail is relatively short, and the ears are large.
Females have eight mammae.
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