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The genus Troglobius (Collembola: Paronellidae: Cyphoderinae) is known only from the Southern Hemisphere, the two species found so far were described from caves in Madagascar and Brazil. In this paper we describe a new Brazilian species and complement the descriptions of the previously known species. The new species is a troglomorph and was collected in a single cave, in iron formations in the state of Minas Gerais. Brazil. The original diagnosis of the genus is supplemented with new characters based on observations of the new species.