A new species of Physoctonus Mello-Leitão, 1934 from the 'Campos formations' of southern Amazonia (Scorpiones, Buthidae)

Further studies on new specimens of the rare genus Mello-Leitão, 1934, lead to the description of a third new species. Until now only (C. L. Koch, 1840) and Esposito et al., 2017, were known from sites located in the caatingas of the north-east region of Brazil. The new species of was collected by the French arachnologist J. Vellard in the Campos do Pará during his field trips back to the 1920/1930, and entrusted to the author in the early 1980s. The populations of and from north-east Brazil and that of the new species certainly present disrupted distributions. Biogeographical comments on this pattern of distribution are also added.