Typhlobelus macromycterus, new species, is described from the lower Rio Tocantins, Estado do Para, northern Brazil. It is hypothesized to be closely related to T.ternetziMyers 1944 by the possession of a prominent, duck-beak-shaped snout and by the absence of the pectoral fin; differing from it by the longer snout, the larger interorbital distance, and the straight dorsal profile of the head. The new record of distribution and habitat indicates thatTyphlobelusMyers 1944 may be widespread in the Amazon basin.