Two new Brazilian species of Chelodesmidae of the genera Iguazus and Tessarithys (Diplopoda: Polydesmida)

Two new species of Chelodesmidae from the Brazilian northeast are described, Iguazus robustus sp. nov. , from the state of Paraíba, and Tessarithys exacuminatus sp. nov. , from the states of Pernambuco and Sergipe. Iguazus robustus sp. nov. differs from other species of the genus by having a constriction in the zone of the gonopodal acropodite tip and an extra branch at the tip of the acropodite. Tessarithys exacuminatus sp. nov. differs from the other species of the genus by the large and ascending subterminal dorsal branch of the prefemoral process of the gonopod. Brief reviews of the taxonomy, geographic distribution and a key for males of the respective genera are provided.