Etymology: The species is named after the State Park where the specimens were collected. PERP is the acronym for Parque Estadual do Rio Preto, as it is well known among locals.
Original Type Locality: Male holotype from Parque Estadual do Rio Preto, São Gonçalo do Rio Preto, Minas Gerais, Brazil, 19 January 2010, J. P. L. Guadanucci, W. F. Silva, D. Moura, R. F. Fonseca, Dirck leg. (CAD 024)
Two new species of the genus Tmesiphantes from Serra do Espinhaço, state of Minas Gerais are described. They comprise the first records of the genus outside the Atlantic Forest. Furthermore, the examination of all type material of the genera Tmesiphantes and Melloleitaoina, which have been suggested as sister groups, showed that the thickness of femur III, used to distinguish between them, shows a continuous variation, and the taxonomic usage of this character is discussed.
Studies on Neotropical Fauna and Environment 47: 139-145