58734 Gymnotus mamiraua Albert & Crampton, 2001 Gymnotidae Naked-back knifefishes Gymnotinae Gymnotiformes Teleostei South America: two whitewater lake systems on the Rio Solimões floodplain of central Amazonia (the Mamirauá lake system near Tefé, and Lago Janauacá near Manaus), Amazonas State, Brazil (Ref. 41292). INPA 13503 3 S 64 W 1994 Gymnotus mamiraua