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66380 Imparfinis usmai Ortega-Lara, Milani, DoNascimiento, Villa-Navarro & Maldonado-Ocampo, 2011 Heptapteridae Three-barbeled catfishes Siluriformes Teleostei South America: Colombia. Distributed along the upper basin of río Cauca and río Magdalena, and in the lower río Patía basin on the Pacific slope of western cordillera of Colombia. <i>Imparfinis usmai</i> is sympatric with <i>I. nemacheir</i> in the río Magdalena.