Species of Grosphus Simon, 1880, associated to the group madagascariensis / hirtus (Scorpiones: Buthidae); description of a peculiar new species from the humid eastern forests of Madagascar

Uplands areas of the central eastern Madagascar are not considered amongst the regions of the island that show high levels of scorpion diversity. Previous surveys conducted in the Ambatovy-Analamay-Torotorofotsy humid forests at around 1000 m, revealed the presence of different species of Grosphus. The detailed study of several individuals of one of these populations indicates the presence of a new species associated with Grosphus hirtus Kraepelin, 1900. This new species, G. voahangyae sp. n., is described in the paper. Some comments on biogeographic aspects linking the new species with both G. madagascariensis (Gervais, 1843) and G. hirtus are also provided.