Found only in a stretch of the Arroio Garapiá upstream from a major and well known waterfall in its lower course (Ref. 105131). Arroio Garapiá is a tributary to the Rio Forqueta, itself a tributary to the Rio Maquiné which empties in the Tramandaí Lagoon system in the coastal plains of Rio Grande do Sul. After extensive collection efforts from the Rio Maquiné drainage basin during the past several years, this species was never recorded from the main river itself or in other adjacent streams. The entire type series was obtained only at a private and well-preserved area. Since this species occurs in low abundance and very restricted area, the establishment of a Private Reserve of Natural Heritage-RPPN would be a good alternative for preserving this species (Ref. 105131).