Abstract
Two new species of Chelodesmidae from the Brazilian northeast are described, Iguazus robustussp. nov., from the state of Paraíba, and Tessarithys exacuminatussp. nov., from the states of Pernambuco and Sergipe. Iguazus robustussp. 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 exacuminatussp. 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.
Highlights
Among the Diplopoda, with almost 5,000 described species in 31 families, the Polydesmida Leach, 1814 is the most speciose order (Brewer et al 2012)
Chelodesmidae constitutes the second largest family, with about 800 described species. Members of this family occur in western Africa (Prepodesminae Cook, 1896) and South America (Chelodesminae Cook, 1895), according to Hoffman (1980)
The systematics of Chelodesminae was reviewed by Hoffman (1980), who placed some genera and species in tribes
Summary
Among the Diplopoda, with almost 5,000 described species in 31 families, the Polydesmida Leach, 1814 is the most speciose order (Brewer et al 2012). Chelodesmidae constitutes the second largest family, with about 800 described species Members of this family occur in western Africa (Prepodesminae Cook, 1896) and South America (Chelodesminae Cook, 1895), according to Hoffman (1980). Many members of various groups within the Chelodesmidae share character states in their external morphology, and are mostly differentiated by variations in the structures of the male gonopod. These differences in the gonopod indicate that it has undergone rapid divergent evolution in the genitalia, as evidenced in numerous other arthropod groups (Eberhard 2010). In this work we describe the new species Iguazus robustus sp. nov. from Araruna, state of Paraíba and Tessarithys exacuminatus sp. nov. from São Caetano, state of Pernambuco and provide a map of their records
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