58747 Gymnotus melanopleura Albert & Crampton, 2001 Gymnotidae Naked-back knifefishes Gymnotinae Gymnotiformes Teleostei South America: Mamirauá lake system near Tefé, Amazonas, Brazil and Rio Napo drainage, Loreto, Peru (Ref. 41292). Reported from the upper Amazon River basin, Brazil (Ref. 36692). INPA 9966 3 S 64 W 1994 Gymnotus melanopleura