Abstract
Members of Martarega White are stream inhabitants and tend to be gregarious, forming large schools in deep sheltered eddies. Most of the species of Martarega are known from Neotropics, and nine of them have been reported from Brazil. Martarega oriximinaensis Barbosa, Ribeiro and Ferreira-Keppler, sp. nov. is described here from Oriximiná, Pará. This species resembles M. hungerfordi Truxal in having a sharp concavity in the hind trochanter, and a narrow median stripe in the hemelytra and teeth in the costal margin of female hemelytra; but members of M. oriximinaensis can be readily recognized by the presence of one or two groups of very cohesive, short bristles near the lateral margin of the middle trochanter and by the distinctive shape of the male claspers. In M. oriximinaensis sp. nov. the female hemelytra bear at least 30 teeth on its costal margin, whereas in M. hungerfordi the female hemelytra bear at least sixteen teeth on such costal margin. A key to the species of Martarega occurring in northern Brazil is provided. New records of M. brasiliensis Truxal and M. membranacea White from Pará State (northern Brazil) are given. Members of M. uruguayensis (Berg) are newly recorded from São Paulo State (southeastern Brazil).References
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